Helmi, prof.dr. Amina

Amina Helmi (1970) is hoogleraar Dynamica, structuur en vorming van de Melkweg. Helmi schreef een baanbrekend proefschrift (waarvoor ze de Christiaan Huygens-prijs 2004 ontving) waarin de geschiedenis en het ontstaan van onze Melkweg in een nieuw licht werden geplaatst: ons Melkwegstelstel is waarschijnlijk geleidelijk aangegroeid met kleinere sterrenstelsels. Helmi spoort die aparte sterrenstelsels ('fossielen') op en bedrijft dus een soort astro-archeologie; ze gebruikt de informatie van sterfossielen om het ontstaan van de Melkweg te reconstrueren.

Helmi heeft een aantal gerenommeerde subsidies ontvangen, zoals een VIDI van NWO in 2003 en, in 2009, een ERC Starting Grant van de EU. Ze is actief in allerlei internationale netwerken en is in 2017 benoemd tot lid van de Koninklijke Nederlandse Akademie van Wetenschappen. Een team met Amina Helmi bracht in augustus 2014 in Science voor het eerst de ruimtelijke verdeling van de onbekende materie tussen de sterren in beeld. Helmi is nauw betrokken bij de in 2013 gelanceerde GAIA-telescoop die met zeer preciese metingen het Melkwegstelsel in kaart brengt. In 2015 ontving ze voor haar hiernaar onderzoek een VICI-subsidie en in 2017 opnieuw een NWO-subsidie. In 2018 kreeg ze met haar onderzoeksgroep als een van de eersten de gelegenheid om de tweede set gegevens van de GAIA-telescoop te bestuderen.

Eerder in het nieuws

'Smoking gun'. Amina Helmi wist dat ze moest wachten op Gaia
Melkweg kreeg zijn vorm door botsing met ander sterrenstelsel NOS, 31 oktober 2018
Sterrenkundigen vinden de reus die de jonge Melkweg zijn vorm gaf RUG-nieuws, 31 oktober 2018
Spectaculaire’ ontdekking: het sterrenstelsel trilt nog na van kosmische megaklap de Volkskrant, 20 september 2018
Klein sterrenstelsel maakte 'slakkenhuis' in onze hoek van Melkweg RUG-nieuws, 19 september 2018
‘We zijn stelsels rond de Melkweg kwijt’ NRC, 4 juni 2018
Gegevens van ruim een miljard sterren liggen 'op straat' dankzij ruimtetelescoop Gaia de Volkskrant, 25 april 2018
Een sneak peek voor Amina Helmi UK, 25 april 2018
Revolutie in de sterrenkunde door nieuwe metingen RUG-nieuws, 25 april 2018
Helmi benoemd tot lid KNAW RUG-nieuws, 10 mei 2017
NWO-subsidie voor Prof. Amina Helmi RUG-nieuws, 24 april 2017
Astronomen watertanden bij ‘doos vol bonbons’ RUG Science Linx, 30 januari 2017
Oratie Helmi: the fascinating Milky Way RUG-nieuws, 11 november 2014
Meer zicht op mysterieuze materie RUG Science Linx, 14 augustus 2014
Planetoïde vernoemd naar Helmi Astronomie.nl, 24 september 2013
Groningse sterrenkundige Amina Helmi mede-ontdekker van nieuwe sterrenstroom in de Melkweg RUG-nieuws, 2 februari 2011
Ster in sterrenkunde Broerstraat 5, oktober 2004

Contact en meer informatie

Publicaties

2018

Massari, D., & Helmi, A. (2018). With and without spectroscopy: Gaia DR2 proper motions of seven Ultra- Faint Dwarf Galaxies. Astronomy & astrophysics, 620, [A155]. https://doi.org/10.1051/0004-6361/201833367

Sakari, C. M., Placco, V. M., Farrell, E. M., Roederer, I. U., Wallerstein, G., Beers, T. C., ... Watson, F. (2018). The R-Process Alliance: First Release from the Northern Search for r-process-enhanced Metal-poor Stars in the Galactic Halo. The Astrophysical Journal, 868(2), [110]. https://doi.org/10.3847/1538-4357/aae9df

Helmi, A., Babusiaux, C., Koppelman, H. H., Massari, D., Veljanoski, J., & Brown, A. G. A. (2018). The merger that led to the formation of the Milky Way’s inner stellar halo and thick disk. Nature, 563(7729), 85-88. https://doi.org/10.1038/s41586-018-0625-x

Antoja, T., Helmi, A., Romero-Gómez, M., Katz, D., Babusiaux, C., Drimmel, R., ... Soubiran, C. (2018). A dynamically young and perturbed Milky Way disk. Nature, 561(7723), 360-362. https://doi.org/10.1038/s41586-018-0510-7

Gaia Collaboration (2018). Gaia Data Release 2: Mapping the Milky Way disc kinematics. Astronomy & astrophysics, 616, [11]. https://doi.org/10.1051/0004-6361/201832865

Gaia Collaboration (2018). Gaia Data Release 2: Summary of the contents and survey properties. Astronomy & astrophysics, 616, [1]. https://doi.org/10.1051/0004-6361/201833051

Gaia Collaboration (2018). Gaia Data Release 2: Observations of solar system objects. Astronomy & astrophysics, 616, [13]. https://doi.org/10.1051/0004-6361/201832900

Hagen, J. H. J., & Helmi, A. (2018). The surface mass density in the solar neighbourhood using red clumps stars in TGASxRAVE. In C. Chiappini, I. Minchev, E. Starkenburg, & M. Valentini (Eds.), Rediscovering Our Galaxy (pp. 304-305). (Proceedings of the International Astronomical Union Symposia and Colloquia; Vol. S334). Cambridge University Press. https://doi.org/10.1017/S1743921317006524

Gaia Collaboration (2018). Gaia Data Release 2: The celestial reference frame (Gaia-CRF2). Astronomy and astrophysics, 616, [A14]. https://doi.org/10.1051/0004-6361/201832916

Koppelman, H. H., & Helmi, A. (2018). Time evolution of the properties of gaps in stellar streams in axisymmetric potentials. In C. Chiappini, I. Minchev, E. Starkenburg, & M. Valentini (Eds.), Rediscovering Our Galaxy (pp. 321-322). (Proceedings of the International Astronomical Union Symposia and Colloquia; Vol. S334). Cambridge University Press. https://doi.org/10.1017/S1743921317006901

Posti, L., Helmi, A., Veljanoski, J., & Breddels, M. A. (2018). The dynamically selected stellar halo of the Galaxy with Gaia and the tilt of the velocity ellipsoid. Astronomy and astrophysics, 615, A70. https://doi.org/10.1051/0004-6361/201732277

McMillan, P. J., Kordopatis, G., Kunder, A., Binney, J., Wojno, J., Zwitter, T., ... Wyse, R. F. G. (2018). Improved distances and ages for stars common to TGAS and RAVE. Monthly Notices of the Royal Astronomical Society, 477(4), 5279-5300. https://doi.org/10.1093/mnras/sty990

Hagen, J. H. J., & Helmi, A. (2018). The vertical force in the solar neighbourhood using red clump stars in TGAS and RAVE: Constraints on the local dark matter density. Astronomy and astrophysics, 615, [A99]. https://doi.org/10.1051/0004-6361/201832903

Koppelman, H., Helmi, A., & Veljanoski, J. (2018). One Large Blob and Many Streams Frosting the nearby Stellar Halo in Gaia~DR2. Astrophysical Journal Letters, 860(1), L11. https://doi.org/10.3847/2041-8213/aac882

Letarte, B., Hill, V., Tolstoy, E., Jablonka, P., Shetrone, M., Venn, K. A., ... Sadakane, K. (2018). Corrigendum: A high-resolution VLT/FLAMES study of individual stars in the centre of the Fornax dwarf spheroidal galaxy. Astronomy and astrophysics, 613, C1. https://doi.org/10.1051/0004-6361/200913413e

Carrillo, I., Minchev, I., Kordopatis, G., Steinmetz, M., Binney, J., Anders, F., ... Zwitter, T. (2018). Is the Milky Way still breathing? RAVE-Gaia streaming motions. Monthly Notices of the Royal Astronomical Society, 475(2), 2679-2696. https://doi.org/10.1093/mnras/stx3342

Veljanoski, J., Posti, L., Helmi, A., & Breddels, M. A. (2018). Unveiling the stellar halo with TGAS. In A. Recio-Blanco, P. de Laverny, A. G. A. Brown, & T. Prusti (Eds.), Proceedings of the International Astronomical Union: Astrometry and Astrophysics in the Gaia sky (Vol. 12, pp. 275-276). Cambridge University Press. https://doi.org/10.1017/S1743921317007141

Koppelman, H. H., & Helmi, A. (2018). The time evolution of gaps in tidal streams in axisymmetric potentials. In A. Recio-Blanco, P. de Laverny, A. G. A. Brown, & T. Prusti (Eds.), Proceedings of the International Astronomical Union: Astrometry and Astrophysics in the Gaia sky (Vol. 12, pp. 229-230). Cambridge University Press. https://doi.org/10.1017/S1743921317006135

Hagen, J. H. J., & Helmi, A. (2018). The kinematics and surface mass density in the solar neighbourhood using TGASxRAVE. In A. Recio-Blanco, P. de Laverny, A. G. A. Brown, & T. Prusti (Eds.), Proceedings of the International Astronomical Unian: Astrometry and astrophysics in the Gaia sky (Vol. 12, pp. 160-163). Cambridge University Press. https://doi.org/10.1017/S1743921317005725

Massari, D., Breddels, M. A., Helmi, A., Posti, L., Brown, A. G. A., & Tolstoy, E. (2018). Three-dimensional motions in the Sculptor dwarf galaxy as a glimpse of a new era. Nature Astronomy, 2(2), 156-161. [A70]. https://doi.org/10.1038/s41550-017-0322-y

Arenou, F., Luri, X., Babusiaux, C., Fabricius, C., Helmi, A., Muraveva, T., ... Zurbach, C. (2018). Gaia Data Release 2: Catalogue validation. Unpublished. https://doi.org/10.1051/0004-6361/201833234

Gaia Collaboration (2018). Gaia Data Release 2: Observational Hertzsprung-Russell diagrams. Unpublished. https://doi.org/10.1051/0004-6361/201832843

Gaia Collaboration (2018). Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way. Unpublished. https://doi.org/10.1051/0004-6361/201832698

2017

van Oirschot, P., Nelemans, G., Starkenburg, E., Toonen, S., Helmi, A., & Zwart, S. P. (2017). White dwarfs in the building blocks of the Galactic spheroid. Astronomy & astrophysics, 607, [A99]. https://doi.org/10.1051/0004-6361/201730418

Gaia Collaboration, U., Clementini, G., Eyer, L., Ripepi, V., Marconi, M., Muraveva, T., ... Zschocke, S. (2017). Gaia Data Release 1. Testing parallaxes with local Cepheids and RR Lyrae stars. Astronomy & astrophysics, 605, A79. https://doi.org/10.1051/0004-6361/201629925

Wojno, J., Kordopatis, G., Piffl, T., Binney, J., Steinmetz, M., Matijevič, G., ... Siebert, A. (2017). The selection function of the RAVE survey. Monthly Notices of the Royal Astronomical Society, 468(3), 3368-3380. https://doi.org/10.1093/mnras/stx606

Matijevič, G., Chiappini, C., Grebel, E. K., Wyse, R. F. G., Zwitter, T., Bienaymé, O., ... Watson, F. (2017). Very metal-poor stars observed by the RAVE survey. Astronomy & astrophysics, 603, [A19]. https://doi.org/10.1051/0004-6361/201730417

Gaia Collaboration (2017). Gaia Data Release 1. Open cluster astrometry: performance, limitations, and future prospects. Astronomy & astrophysics, 601, [A19]. https://doi.org/10.1051/0004-6361/201730552

Buist, H. J. T., & Helmi, A. (2017). Behaviour of streams in angle and frequency spaces in different potentials. Astronomy & astrophysics, 601, [37]. https://doi.org/10.1051/0004-6361/201527930

Casey, A. R., Hawkins, K., Hogg, D. W., Ness, M., Rix, H-W., Kordopatis, G., ... Wyse, R. (2017). The RAVE-on Catalog of Stellar Atmospheric Parameters and Chemical Abundances for Chemo-dynamic Studies in the Gaia Era. The Astrophysical Journal, 840(1), [59]. https://doi.org/10.3847/1538-4357/aa69c2

Antoja, T., Kordopatis, G., Helmi, A., Monari, G., Famaey, B., Wyse, R. F. G., ... Zwitter, T. (2017). Asymmetric metallicity patterns in the stellar velocity space with RAVE. Astronomy & astrophysics, 601, [A59]. https://doi.org/10.1051/0004-6361/201629387

Valentini, M., Chiappini, C., Davies, G. R., Elsworth, Y. P., Mosser, B., Lund, M. N., ... Mott, A. (2017). RAVE stars in K2. I. Improving RAVE red giants spectroscopy using asteroseismology from K2 Campaign 1. Astronomy & astrophysics, 600, [A66]. https://doi.org/10.1051/0004-6361/201629701

Arenou, F., Luri, X., Babusiaux, C., Fabricius, C., Helmi, A., Robin, A. C., ... Bragaglia, A. (2017). Gaia Data Release 1: Catalogue validation. Astronomy & astrophysics, 599, [A50]. https://doi.org/10.1051/0004-6361/201629895, https://doi.org/10.1051/0004-6361/201629895

Massari, D., Posti, L., Helmi, A., Fiorentino, G., & Tolstoy, E. (2017). The power of teaming up HST and Gaia: The first proper motion measurement of the distant cluster NGC 2419. Astronomy and astrophysics, 598, [L9]. https://doi.org/10.1051/0004-6361/201630174

Kunder, A., Kordopatis, G., Steinmetz, M., Zwitter, T., McMillan, P. J., Casagrande, L., ... Mosser, B. (2017). The Radial Velocity Experiment (RAVE): Fifth Data Release. The Astronomical Journal, 153(2), 75. https://doi.org/10.3847/1538-3881/153/2/75

Sanderson, R. E., Hartke, J., & Helmi, A. (2017). Modeling the Gravitational Potential of a Cosmological Dark Matter Halo with Stellar Streams. The Astrophysical Journal, 836(2), [234]. https://doi.org/10.3847/1538-4357/aa5eb4

Helmi, A., Veljanoski, J., Breddels, M. A., Tian, H., & Sales, L. V. (2017). A box full of chocolates: The rich structure of the nearby stellar halo revealed by Gaia and RAVE. Astronomy and astrophysics, 598, [A58]. https://doi.org/10.1051/0004-6361/201629990

van Oirschot, P., Starkenburg, E., Helmi, A., & Nelemans, G. (2017). Building blocks of the Milky Way's accreted spheroid. Monthly Notices of the Royal Astronomical Society, 464(1), 863-875. https://doi.org/10.1093/mnras/stw2340

2016

Collaboration, G., Brown, A. G. A., Vallenari, A., Prusti, T., de Bruijne, J. H. J., Mignard, F., ... Zschocke, S. (2016). Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties. Astronomy & astrophysics, 595, [A2]. https://doi.org/10.1051/0004-6361/201629512

Helmi, A., & Koppelman, H. H. (2016). The Time Evolution of Gaps in Tidal Streams. Astrophysical Journal Letters, 828(1). https://doi.org/10.3847/2041-8205/828/1/L10

Veljanoski, J., & Helmi, A. (2016). The kinematics of globular clusters systems in the outer halos of the Aquarius simulations. Astronomy & astrophysics, 592(August 2016), [A55]. https://doi.org/10.1051/0004-6361/201628292

Buist, H. J. T., & Helmi, A. (2016). Corrigendum: A new fitting-function to describe the time evolution of a galaxy's gravitational potential ( Mar-2014 In : Astronomy & Astrophysics. 563, p. A110 5 p.). Astronomy and astrophysics, 589, [C3]. https://doi.org/10.1051/0004-6361/201323059e

Starkenburg, T. K., Helmi, A., & Sales, L. V. (2016). Dark influences II. Gas and star formation in minor mergers of dwarf galaxies with dark satellites. Astronomy and astrophysics, 587(March 2016), [A24]. https://doi.org/10.1051/0004-6361/201527247

Collaboration, G., Prusti, T., de Bruijne, J. H. J., Brown, A. G. A., Vallenari, A., Babusiaux, C., ... Zschocke, S. (2016). The Gaia mission. Astronomy and astrophysics, 595(November), [A1]. https://doi.org/10.1051/0004-6361/201629272

Starkenburg, T. K., Helmi, A., & Sales, L. V. (2016). Dark influences. III. Structural characterization of minor mergers of dwarf galaxies with dark satellites. Astronomy and astrophysics, 595( November 2016 ), [A56]. https://doi.org/10.1051/0004-6361/201528066

Yaryura, C. Y., Helmi, A., Abadi, M. G., & Starkenburg, E. (2016). The low-mass end of the neutral gas mass and velocity width functions of galaxies in ΛCDM. Monthly Notices of the Royal Astronomical Society, 457, 2415-2422. https://doi.org/10.1093/mnras/stw139

Helmi, A., Bragaglia, A., Arnaboldi, M., Rejkuba, M., & Romano, D. (2016). Stellar halos and the link to galaxy formation. In Proceedings of the International Astronomical Union (S317 ed., Vol. 11, pp. 228-234) https://doi.org/10.1017/S1743921315009771

de Jong, R. S., Barden, S. C., Bellido-Tirado, O., Brynnel, J. G., Frey, S., Giannone, D., ... Starkenburg, E. (2016). 4MOST: the 4-metre Multi-Object Spectroscopic Telescope project at preliminary design review. In Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99081O (August 9, 2016) [99081O] https://doi.org/10.1117/12.2232832

2015

Buist, H. J. T., & Helmi, A. (2015). The evolution of streams in a time-dependent potential. Astronomy & astrophysics, 584, [A120]. https://doi.org/10.1051/0004-6361/201526203

Breddels, M. A., Vera-Ciro, C., & Helmi, A. (2015). Matching the Dark Matter Profiles of dSph Galaxies with Those of Simulated Satellites: A Two-parameter Comparison. The Astrophysical Journal, 814, L23. https://doi.org/10.1088/2041-8205/814/2/L23

Jablonka, P., North, P., Mashonkina, L., Hill, V., Revaz, Y., Shetrone, M., ... François, P. (2015). The early days of the Sculptor dwarf spheroidal galaxy. Astronomy and astrophysics, 583, [A67]. https://doi.org/10.1051/0004-6361/201525661

van Oirschot, P., Starkenburg, E., Helmi, A., & Nelemans, G. (2015). Building blocks of the Milky Way's stellar halo. IAU General Assembly , 22, 2256918.

Helmi, A. (2015). The connection between galaxy formation and the assembly of stellar halos in the Local Group. IAU General Assembly , 22, 2255632.

Helmi, A. (2015). Galactic dynamics in the era of Gaia. IAU General Assembly , 22, 2257323.

Antoja, T., Figueras, F., Helmi, A., Monari, G., & RAVE Collaboration, U. (2015). Dynamical processes in the disk of the Milky Way and Gaia perspective. In Highlights of Spanish Astrophysics VIII, Proceedings of the XI Scientific Meeting of the Spanish Astronomical Society held on September 8-12, 2014, in Teruel, Spain, ISBN 978-84-606-8760-3. A. J. Cenarro, F. Figueras, C. Hernández-Monteagudo, J. Trujillo Bueno, and L. Valdivielso (eds.), p. 384-389 (pp. 384-389)

Helmi, A., & Sanderson, R. E. (2015). Mass modelling from stellar streams in the Milky Way. In Galaxy Masses as Constraints of Formation Models : Proceedings of the International Astronomical Union, IAU Symposium (Vol. 311, pp. 11-15). International Astronomical Union. https://doi.org/10.1017/S1743921315003300

Kordopatis, G., Binney, J., Gilmore, G., Wyse, R. F. G., Belokurov, V., McMillan, P. J., ... Zwitter, T. (2015). The rich are different: evidence from the RAVE survey for stellar radial migration. Monthly Notices of the Royal Astronomical Society, 447(4), 3526-3535. https://doi.org/10.1093/mnras/stu2726

E. Sanderson, R., Helmi, A., & W. Hogg, D. (2015). Action-space Clustering of Tidal Streams to Infer the Galactic Potential. The Astrophysical Journal, 801(2), [98]. https://doi.org/10.1088/0004-637X/801/2/98

Starkenburg, T. K., & Helmi, A. (2015). Dark influences: imprints of dark satellites on dwarf galaxies. Astronomy and astrophysics, 575(A59), [A59]. https://doi.org/10.1051/0004-6361/201425082

De Lucia, G., Tornatore, L., Frenk, C. S., Helmi, A., Navarro, J. F., & White, S. D. M. (2015). Erratum: elemental abundances in Milky Way-like galaxies from a hierarchical galaxy formation model. Monthly Notices of the Royal Astronomical Society, 447(4), 3420-3421. https://doi.org/10.1093/mnras/stu2609

Hawkins, K., Kordopatis, G., Gilmore, G., Masseron, T., Wyse, R. F. G., Ruchti, G., ... Zwitter, T. (2015). Characterizing the high-velocity stars of RAVE: the discovery of a metal-rich halo star born in the Galactic disc. Monthly Notices of the Royal Astronomical Society, 447(2), 2046-2058. https://doi.org/10.1093/mnras/stu2574

Antoja , T., Monari, G., Helmi, A., Bienaymé, O., Bland-Hawthorn, J., Famaey, B., ... Zwitter, T. (2015). The Imprints of the Galactic Bar on the Thick Disk with Rave. Astrophysical Journal Letters, 800(2), [32]. https://doi.org/10.1088/2041-8205/800/2/L32

Sanderson, R. E., Hartke, J., Helmi, A., & Hogg, D. W. (2015). Inferring the Galactic gravitational potential with Gaia and friends. Bulletin of the American Astronomical Society, 47(2), 36-36.

2014

Lemasle, B., de Boer, T. J. L., Hill, V., Tolstoy, E., Irwin, M. J., Jablonka, P., ... Szeifert, T. (2014). High resolution spectroscopy of Red Giant Branch stars and the chemical evolution of the Fornax dwarf spheroidal galaxy. In J. Ballet, F. Martins, F. Bournaud, R. Monier, & C. Reylé (Eds.), SF2A-2014: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics (pp. 337-340)

Piffl, T., Binney, J., McMillan, P. J., Steinmetz, M., Helmi, A., Wyse, R. F. G., ... Zwitter, T. (2014). Constraining the Galaxy's dark halo with RAVE stars. Monthly Notices of the Royal Astronomical Society, 445(3), 3133-3151. https://doi.org/10.1093/mnras/stu1948

Lemasle, B., de Boer, T. J. L., Hill, V., Tolstoy, E., Irwin, M. J., Jablonka, P., ... Szeifert, T. (2014). VLT/FLAMES spectroscopy of red giant branch stars in the Fornax dwarf spheroidal galaxy. Astronomy and astrophysics, 572, [A88]. https://doi.org/10.1051/0004-6361/201423919

Kunder, A., Bono, G., Piffl, T., Steinmetz, M., Grebel, E. K., Anguiano, B., ... Helmi, A. (2014). Spectroscopic signatures of extratidal stars around the globular clusters NGC 6656 (M 22), NGC 3201, and NGC 1851 from RAVE. Astronomy and astrophysics, 572, [A30]. https://doi.org/10.1051/0004-6361/201424113

De Lucia, G., Tornatore, L., Frenk, C. S., Helmi, A., Navarro, J. F., & White, S. D. M. (2014). Elemental abundances in Milky Way-like galaxies from a hierarchical galaxy formation model. Monthly Notices of the Royal Astronomical Society, 445, 970-987. https://doi.org/10.1093/mnras/stu1752

Munari, U., Henden, A., Frigo, A., Zwitter, T., Bienaymé, O., Bland-Hawthorn, J., ... Wyse, R. F. G. (2014). APASS Landolt-Sloan BVgri Photometry of RAVE Stars. I. Data, Effective Temperatures, and Reddenings. The Astronomical Journal, 148, 81. https://doi.org/10.1088/0004-6256/148/5/81

Sharma, S., Bland-Hawthorn, J., Binney, J., Freeman, K. C., Steinmetz, M., Boeche, C., ... Zwitter, T. (2014). Kinematic Modeling of the Milky Way Using the RAVE and GCS Stellar Surveys. The Astrophysical Journal, 793, 51. https://doi.org/10.1088/0004-637X/793/1/51

Monari, G., Helmi, A., Antoja, T., & Steinmetz, M. (2014). The Galactic bar and the large scale velocity gradients in the Galactic disk. Astronomy and astrophysics, 569, [A69]. https://doi.org/10.1051/0004-6361/201423666

van Oirschot, P., Nelemans, G., Toonen, S., Pols, O., Brown, A. G. A., Helmi, A., & Portegies Zwart, S. (2014). Binary white dwarfs in the halo of the Milky Way. Astronomy and astrophysics, 569, [A42]. https://doi.org/10.1051/0004-6361/201424195

Breddels, M. A., & Helmi, A. (2014). Complexity on dwarf galaxy scales: A bimodal distributionfFunction in sculptor. The Astrophysical Journal, 791, L3. https://doi.org/10.1088/2041-8205/791/1/L3

Helmi, A., Williams, M., Freeman, K. C., Bland-Hawthorn, J., & De Silva, G. (2014). More pieces of the puzzle: Chemistry and substructures in the galactic thick disk. Astrophysical Journal, 791, 135. https://doi.org/10.1088/0004-637X/791/2/135

Kos, J., Zwitter, T., Wyse, R., Bienaymé, O., Binney, J., Bland-Hawthorn, J., ... Williams, M. E. K. (2014). Pseudo-three-dimensional maps of the diffuse interstellar band at 862 nm. Science, 345, 791-795. https://doi.org/10.1126/science.1253171

Recio-Blanco, A., de Laverny, P., Kordopatis, G., Helmi, A., Hill, V., Gilmore, G., ... Maiorca, E. (2014). The Gaia-ESO Survey: the Galactic thick to thin disc transition. Astronomy and astrophysics, 567, [A5]. https://doi.org/10.1051/0004-6361/201322944

Jin, S., Helmi, A., & Breddels, M. (2014). What can Gaia proper motions tell us about Milky Way dwarf galaxies? In EAS Publications Series (pp. 241-245) https://doi.org/10.1051/eas/1567043

de Jong, R. S., Barden, S., Bellido-Tirado, O., Brynnel, J., Chiappini, C., Depagne, É., ... Richard, J. (2014). 4MOST: 4-metre Multi-Object Spectroscopic Telescope. In Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (pp. 91470M) https://doi.org/10.1117/12.2055826

Binney, J., Burnett, B., Kordopatis, G., Steinmetz, M., Gilmore, G., Bienayme, O., ... Zwitter, T. (2014). Galactic kinematics and dynamics from Radial Velocity Experiment stars. Monthly Notices of the Royal Astronomical Society, 439, 1231-1244. https://doi.org/10.1093/mnras/stt2367

Vera Ciro, C., Sales, L. V., Helmi, A., & Navarro, J. F. (2014). The shape of dark matter subhaloes in the Aquarius simulations. Monthly Notices of the Royal Astronomical Society, 439(3), 2863-2872. https://doi.org/10.1093/mnras/stu153

Antoja, T., Helmi, A., Dehnen, W., Bienaymé, O., Bland-Hawthorn, J., Famaey, B., ... Zwitter, T. (2014). Constraints on the Galactic bar from the Hercules stream as traced with RAVE across the Galaxy. Astronomy and astrophysics, 563, [A60]. https://doi.org/10.1051/0004-6361/201322623

Buist, H. J. T., & Helmi, A. (2014). A new fitting-function to describe the time evolution of a galaxy's gravitational potential. Astronomy & astrophysics, 563, [A110]. https://doi.org/10.1051/0004-6361/201323059

Piffl, T., Scannapieco, C., Binney, J., Steinmetz, M., Scholz, R-D., Williams, M. E. K., ... Zwitter, T. (2014). The RAVE survey: the Galactic escape speed and the mass of the Milky Way. Astronomy and astrophysics, 562, [A91]. https://doi.org/10.1051/0004-6361/201322531

Kordopatis, G., Gilmore, G., Steinmetz, M., Boeche, C., Seabroke, G. M., Siebert, A., ... Zerjal, M. (2014). VizieR Online Data Catalog: RAVE 4th data release (Kordopatis+, 2013). VizieR Online Data Catalog, 3272.

Sanderson, R., Helmi, A., & Hogg, D. W. (2014). Action-space clustering of tidal streams to infer the Galactic potential. In American Astronomical Society Meeting Abstracts (pp. 346.10)

Sanderson, R. E., Helmi, A., & Hogg, D. W. (2014). Action-space clustering of tidal streams to map the Galactic potential. In Setting the scene for Gaia and LAMOST (pp. 207-212). (Proceedings of the International Astronomical Union; Vol. 9, No. S298). Cambridge University Press. https://doi.org/10.1017/S1743921313006388

Antoja, T., & Helmi, A. (2014). Constraints on the Galactic bar with RAVE. In IAU Symposium (pp. 395-395) https://doi.org/10.1017/S1743921313006625

Minchev, I., Chiappini, C., Martig, M., Steinmetz, M., de Jong, R. S., Boeche, C., ... Williams, M. (2014). A New Stellar Chemo-Kinematic Relation Reveals the Merger History of the Milky Way Disk. The Astrophysical Journal, 781, L20. https://doi.org/10.1088/2041-8205/781/1/L20

Binney, J., Burnett, B., Kordopatis, G., McMillan, P. J., Sharma, S., Zwitter, T., ... Wyse, R. F. G. (2014). New distances to RAVE stars. Monthly Notices of the Royal Astronomical Society, 437(1), 351-370. https://doi.org/10.1093/mnras/stt1896

van Oirschot, P., Nelemans, G., Helmi, A., Starkenburg, E., Pols, O., & Brown, A. G. A. (2014). Binary White Dwarfs in the Galactic Halo. In IAU Symposium (pp. 431-431) https://doi.org/10.1017/S1743921313006972

2013

Gomez, F. A., Helmi, A., Cooper, A. P., Frenk, C. S., Navarro, J. F., & White, S. D. M. (2013). Streams in the Aquarius stellar haloes. Monthly Notices of the Royal Astronomical Society, 436(4), 3602-3613. https://doi.org/10.1093/mnras/stt1838

Williams, M. E. K., Steinmetz, M., Binney, J., Siebert, A., Enke, H., Famaey, B., ... Zwitter, T. (2013). The wobbly Galaxy: Kinematics north and south with RAVE red-clump giants. Monthly Notices of the Royal Astronomical Society, 436(1), 101-121. https://doi.org/10.1093/mnras/stt1522

Kordopatis, G., Gilmore, G., Steinmetz, M., Boeche, C., Seabroke, G. M., Siebert, A., ... Zerjal, M. (2013). The radial velocity experiment (RAVE): Fourth data release. The Astronomical Journal, 146(5), [134]. https://doi.org/10.1088/0004-6256/146/5/134

Kordopatis, G., Gilmore, G., Steinmetz, M., Boeche, C., Seabroke, G. M., Siebert, A., ... Žerjal, M. (2013). The Radial Velocity Experiment (RAVE): Fourth Data Release. The Astronomical Journal, 146, 134. https://doi.org/10.1088/0004-6256/146/5/134

Sanderson, R. E., & Helmi, A. (2013). An analytical phase-space model for tidal caustics. Monthly Notices of the Royal Astronomical Society, 435(1), 378-399. https://doi.org/10.1093/mnras/stt1307

Breddels, M. A., & Helmi, A. (2013). Model comparison of the dark matter profiles of Fornax, Sculptor, Carina and Sextans. Astronomy & astrophysics, 558, [A35]. https://doi.org/10.1051/0004-6361/201321606

Breddels, M. A., & Helmi, A. (2013). An analytic distribution function for a mass-less cored stellar system in a cuspy dark-matter halo. Astronomy & astrophysics, 558, [L3]. https://doi.org/10.1051/0004-6361/201322449

Battaglia, G., Helmi, A., & Breddels, M. (2013). Internal kinematics and dynamical models of dwarf spheroidal galaxies around the Milky Way. New Astronomy Reviews, 57(3-4), 52-79. https://doi.org/10.1016/j.newar.2013.05.003

Breddels, M. A., Helmi, A., van den Bosch, R. C. E., van de Ven, G., & Battaglia, G. (2013). Orbit-based dynamical models of the Sculptor dSph galaxy. Monthly Notices of the Royal Astronomical Society, 433(4), 3173-3189. https://doi.org/10.1093/mnras/stt956

Vera-Ciro, C., & Helmi, A. (2013). Constraints on the Shape of the Milky Way Dark Matter Halo from the Sagittarius Stream. Astrophysical Journal Letters, 773(1), [4]. https://doi.org/10.1088/2041-8205/773/1/L4

Helmi, A. (2013). Confronting Predictions with Observations of DM Halos in LG. In From Dwarfs to Giants: Mike Irwin's travels in the Local Group and Beyond (pp. 22)

Boeche, C., Chiappini, C., Minchev, I., Williams, M., Steinmetz, M., Sharma, S., ... Zwitter, T. (2013). The relation between chemical abundances and kinematics of the Galactic disc with RAVE. Astronomy & astrophysics, 553, [A19]. https://doi.org/10.1051/0004-6361/201219607

Caffau, E., Koch, A., Sbordone, L., Sartoretti, P., Hansen, C. J., Royer, F., ... Schnurr, O. (2013). Velocity and abundance precisions for future high-resolution spectroscopic surveys: A study for 4MOST. Astronomische Nachrichten, 334(3), 197-216. https://doi.org/10.1002/asna.201211814

Starkenburg, E., Helmi, A., De Lucia, G., Li, Y-S., Navarro, J. F., Font, A. S., ... White, S. D. M. (2013). The satellites of the Milky Way: Insights from semi-analytic modelling in a Lambda CDM cosmology. Monthly Notices of the Royal Astronomical Society, 429(1), 725-743. https://doi.org/10.1093/mnras/sts367

Vera-Ciro, C. A., Helmi, A., Starkenburg, E., & Breddels, M. A. (2013). Not too big, not too small: the dark haloes of the dwarf spheroidals in the Milky Way. Monthly Notices of the Royal Astronomical Society, 428(2), 1696-1703. https://doi.org/10.1093/mnras/sts148

van Oirschot, P., Nelemans, G., Pols, O., Helmi, A., Tolstoy, E., Brown, A. G. A., ... Wijburg, M. (2013). Halo white dwarfs in the Gaia era. In Astronomical Society of the Pacific Conference Series: 370 Years of Astronomy in Utrecht (Vol. 470, pp. 377). San Francisco.

2012

Helmi, A., Sales, L. V., Starkenburg, E., Starkenburg, T. K., Vera Ciro, C., De Lucia, G., & Li, Y. -S. (2012). Dark Satellites and the Morphology of Dwarf Galaxies. Astrophysical Journal Letters, 758(1), [5]. https://doi.org/10.1088/2041-8205/758/1/L5

Antoja Castelltort, T., Helmi, A., Bienayme, O., Bland-Hawthorn, J., Famaey, B., Freeman, K., ... Zwitter, T. (2012). Kinematic groups beyond the solar neighbourhood with RAVE. Monthly Notices of the Royal Astronomical Society, 426(1), L1-L5. https://doi.org/10.1111/j.1745-3933.2012.01310.x

de Jong, R. S., Bellido-Tirado, O., Chiappini, C., Depagne, É., Haynes, R., Johl, D., ... Boland, W. (2012). 4MOST: 4-metre multi-object spectroscopic telescope. In Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (pp. 84460T) https://doi.org/10.1117/12.926239

Siebert, A., Famaey, B., Binney, J., Burnett, B., Faure, C., Minchev, I., ... Zwitter, T. (2012). The properties of the local spiral arms from RAVE data: Two-dimensional density wave approach. Monthly Notices of the Royal Astronomical Society, 425(3), 2335-2342. https://doi.org/10.1111/j.1365-2966.2012.21638.x

de Jong, R. S., Bellido-Tirado, O., Chiappini, C., Depagne, É., Haynes, R., Johl, D., ... Boland, W. (2012). 4MOST: 4-metre multi-object spectroscopic telescope. In Proceedings of the SPIE: Ground-based and Airborne Instrumentation for Astronomy IV (Vol. 8446). [84660T] https://doi.org/10.1117/12.926239

Kordopatis, G., Recio-Blanco, A., de Laverny, P., Gilmore, G., Hill, V., Wyse, R. F. G., ... Bienaymé, O. (2012). Metallicity and Kinematics of Thick Disc Stars at Intermediate Galactic Latitudes. In W. Aoki, M. Ishigaki, T. Suda, T. Tsujimoto, & N. Arimoto (Eds.), ASP Conference Proceedings. Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Vol. 458, pp. 175). San Francisco.

Venn, K. A., Shetrone, M. D., Irwin, M. J., Hill, V., Jablonka, P., Tolstoy, E., ... Primas, F. (2012). Nucleosynthesis and the Inhomogeneous Chemical Evolution of the Carina Dwarf Galaxy. Astrophysical Journal, 751(2), [102]. https://doi.org/10.1088/0004-637X/751/2/102

Matijevic, G., Zwitter, T., Bienayme, O., Bland-Hawthorn, J., Boeche, C., Freeman, K. C., ... Wyse, R. F. G. (2012). Exploring the Morphology of RAVE Stellar Spectra. Astrophysical journal supplement series, 200(2), [14]. https://doi.org/10.1088/0067-0049/200/2/14

Helmi, A. (2012). Too big to fail. In Dynamics Meets Kinematic Tracers, Online at http://mpia.de/~dynamics/ringberg/?view=program, id.29 (pp. 29)

Antoja, T., & Helmi, A. (2012). Kinematic groups in distant disc regions with RAVE. In Dynamics Meets Kinematic Tracers (pp. 28)

Helmi, A. (2012). Too big to fail. 29.

Gilmore, G., Randich, S., Asplund, M., Binney, J., Bonifacio, P., Drew, J., ... Vink, J. (2012). The Gaia-ESO Public Spectroscopic Survey. The Messenger, 147, 25-31.

Vera-Ciro, C. A., Sales, L. V., & Helmi, A. (2012). The shape of dark matter haloes in the Aquarius simulations: Evolution and memory. In European Physical Journal Web of Conferences (pp. 01009) https://doi.org/10.1051/epjconf/20121901009

Vera-Ciro, C. A., Sales, L. V., & Helmi, A. (2012). The shape of dark matter haloes in the Aquarius simulations: Evolution and memory. In C. Reyle, A. Robin, & M. Schultheis (Eds.), Assembling the Puzzle of the Milky Way: EPJ Web of Conferences (Vol. 19). [01009] (EPJ Web of Conferences; Vol. 19). E D P SCIENCES. https://doi.org/10.1051/epjconf/20121901009

Breddels, M. A., Helmi, A., van den Bosch, R. C. E., van de Ven, G., & Battaglia, G. (2012). Schwarzschild models of the Sculptor dSph galaxy. In C. Reyle, A. Robin, & M. Schultheis (Eds.), ASSEMBLING THE PUZZLE OF THE MILKY WAY (pp. 03009). (EPJ Web of Conferences; Vol. 19). CEDEX A: E D P SCIENCES. https://doi.org/10.1051/epjconf/20121903009

Antoja, T., Helmi, A., Figueras, F., & Romero-Gómez, M. (2012). Kinematic groups across the MW disc: Insights from models and from the RAVE catalogue. In C. Reyle, A. Robin, & M. Schultheis (Eds.), ASSEMBLING THE PUZZLE OF THE MILKY WAY (pp. 05002). (EPJ Web of Conferences; Vol. 19). CEDEX A: E D P SCIENCES. https://doi.org/10.1051/epjconf/20121905002

Monari, G., Antoja Castelltort, T., & Helmi, A. (2012). Constraining the Milky Way potential using the dynamical kinematic substructures. In C. Reyle, A. Robin, & M. Schultheis (Eds.), ASSEMBLING THE PUZZLE OF THE MILKY WAY [07007] (EPJ Web of Conferences; Vol. 19). E D P SCIENCES. https://doi.org/10.1051/epjconf/20121907007

2011

Boeche, C., Siebert, A., Williams, M., de Jong, R. S., Steinmetz, M., Fulbright, J. P., ... Zwitter, T. (2011). The RAVE Catalog of Stellar Elemental Abundances: First Data Release. The Astronomical Journal, 142(6), 193. [142]. https://doi.org/10.1088/0004-6256/142/6/193

Kordopatis, G., Recio-Blanco, A., de Laverny, P., Gilmore, G., Hill, V., Wyse, R. F. G., ... Bienaymé, O. (2011). Probing the thick disc formation scenarios outside the solar neighbourhood. In G. Alecian, K. Belkacem, R. Samadi, & D. Valls-Gabaud (Eds.), SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: G. Alecian, K. Belkacem, R. Samadi and D. Valls-Gabaud, pp.311-314: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics (pp. 311-314)

Cooper, A. P., Cole, S., Frenk, C. S., & Helmi, A. (2011). A two-point correlation function for Galactic halo stars. Monthly Notices of the Royal Astronomical Society, 417(3), 2206-2215. https://doi.org/10.1111/j.1365-2966.2011.19401.x

Sales, L. V., Navarro, J. F., Cooper, A. P., White, S. D. M., Frenk, C. S., & Helmi, A. (2011). Clues to the 'Magellanic Galaxy' from cosmological simulations. Monthly Notices of the Royal Astronomical Society, 418(1), 648-658. https://doi.org/10.1111/j.1365-2966.2011.19514.x

Kordopatis, G., Recio-Blanco, A., de Laverny, P., Gilmore, G., Hill, V., Wyse, R. F. G., ... Bienayme, O. (2011). A spectroscopic survey of thick disc stars outside the solar neighbourhood. Astronomy & astrophysics, 535, [107]. https://doi.org/10.1051/0004-6361/201117373

Kordopatis, G., Recio-Blanco, A., de Laverny, P., Gilmore, G., Hill, V., Wyse, R. F. G., ... Bienayme, O. (2011). VizieR Online Data Catalog: Spectroscopic survey of 479 thick disc stars (Kordopatis+, 2011). VizieR Online Data Catalog, 353.

Kordopatis, G., Recio-Blanco, A., de Laverny, P., Gilmore, G., Hill, V., Wyse, R. F. G., ... Bienayme, O. (2011). Spectroscopic survey of 479 thick disc stars (Kordopatis+, 2011). VizieR On-line Data Catalog, 353, 59107.

Battaglia, G., Tolstoy, E., Helmi, A., Irwin, M., Parisi, P., Hill, V., & Jablonka, P. (2011). CaII triplet in Sextans dSph galaxy (Battaglia+, 2011). VizieR On-line Data Catalog, 741, 11013.

Font, A. S., Benson, A. J., Bower, R. G., Frenk, C. S., Cooper, A., DeLucia, G., ... White, S. D. M. (2011). The population of Milky Way satellites in the Λ cold dark matter cosmology. Monthly Notices of the Royal Astronomical Society, 417(2), 1260-1279. https://doi.org/10.1111/j.1365-2966.2011.19339.x

Vera-Ciro, C. A., Sales, L. V., Helmi, A., Frenk, C. S., Navarro, J. F., Springel, V., ... White, S. D. M. (2011). The shape of dark matter haloes in the Aquarius simulations: evolution and memory. Monthly Notices of the Royal Astronomical Society, 416(2), 1377-1391. https://doi.org/10.1111/j.1365-2966.2011.19134.x

Ruchti, G. R., Fulbright, J. P., Wyse, R. F. G., Gilmore, G. F., Bienayme, O., Bland-Hawthorn, J., ... Zwitter, T. (2011). Observational Properties of the Metal-poor Thick Disk of the Milky Way and Insights into its Origins. Astrophysical Journal, 737(1), 9. [9]. https://doi.org/10.1088/0004-637X/737/1/9

Burnett, B., Binney, J., Sharma, S., Williams, M., Zwitter, T., Bienayme, O., ... Wyse, R. F. G. (2011). Distance determination for RAVE stars using stellar models: III. The nature of the RAVE survey and Milky Way chemistry. Astronomy & astrophysics, 532, [A113]. https://doi.org/10.1051/0004-6361/201116715

Helmi, A. (2011). Clues to galaxy formation from the Milky Way and Local Group perspective. In Galaxy Formation (pp. 27). University of Groningen.

Siebert, A., Williams, M. E. K., Siviero, A., Reid, W., Boeche, C., Steinmetz, M., ... Wylie-de Boer, E. (2011). The Radial Velocity Experiment (RAVE): Third Data Release. The Astronomical Journal, 141(6), 187. https://doi.org/10.1088/0004-6256/141/6/187

Siebert, A., Williams, M., Siviero, A., Reid, W., Boeche, C., Steinmetz, M., ... Wylie-de Boer, E. (2011). VizieR Online Data Catalog: RAVE 3rd data release (Siebert+, 2011). VizieR Online Data Catalog, 3265.

Siebert, A., Williams, M., Siviero, A., Reid, W., Boeche, C., Steinmetz, M., ... Wylie-de Boer, E. (2011). RAVE 3rd data release (Siebert+, 2011). VizieR On-line Data Catalog, 3265.

Matijevic, G., Zwitter, T., Bienayme, O., Bland-Hawthorn, J., Freeman, K. C., Gilmore, G., ... Wyse, R. F. G. (2011). Single-lined Spectroscopic Binary Star Candidates in the RAVE Survey. The Astronomical Journal, 141(6), 200-208. [200]. https://doi.org/10.1088/0004-6256/141/6/200

Helmi, A., Cooper, A. P., White, S. D. M., Cole, S., Frenk, C. S., & Navarro, J. F. (2011). Substructure in the Stellar Halos of the Aquarius Simulations. Astrophysical Journal Letters, 733(1), [7]. https://doi.org/10.1088/2041-8205/733/1/L7

Wang, J., Navarro, J. F., Frenk, C. S., White, S. D. M., Springel, V., Jenkins, A., ... Vogelsberger, M. (2011). Assembly history and structure of galactic cold dark matter haloes. Monthly Notices of the Royal Astronomical Society, 413(2), 1373-1382. https://doi.org/10.1111/j.1365-2966.2011.18220.x

Wilson, M. L., Helmi, A., Morrison, H. L., Breddels, M. A., Bienayme, O., Binney, J., ... Zwitter, T. (2011). Testing formation mechanisms of the Milky Way's thick disc with RAVE. Monthly Notices of the Royal Astronomical Society, 413(3), 2235-2241. https://doi.org/10.1111/j.1365-2966.2011.18298.x

Siebert, A., Famaey, B., Minchev, I., Seabroke, G. M., Binney, J., Burnett, B., ... Zwitter, T. (2011). Detection of a radial velocity gradient in the extended local disc with RAVE. Monthly Notices of the Royal Astronomical Society, 412(3), 2026-2032. https://doi.org/10.1111/j.1365-2966.2010.18037.x

Tafelmeyer, M., Jablonka, P., Hill, V., Shetrone, M., Tolstoy, E., Irwin, M. J., ... Szeifert, T. (2011). Extremely metal-poor stars in classical dwarf spheroidal galaxies: Fornax, Sculptor, and Sextans (vol 524, pg A58, 2010). Astronomy & astrophysics, 527, [1]. https://doi.org/10.1051/0004-6361/201014733e

Letarte, B., Hill, V., Tolstoy, E., Jablonka, P., Shetrone, M., Venn, K. A., ... Sadakane, K. (2011). Individual stars in Fornax dSph center (Letarte+, 2010). VizieR On-line Data Catalog, 352, 39017.

Tafelmeyer, M., Jablonka, P., Hill, V., Shetrone, M., Tolstoy, E., Irwin, M. J., ... Szeifert, T. (2011). Extremely metal-poor stars in classical dwarf spheroidal galaxies: Fornax, Sculptor, and Sextans. Astronomy and astrophysics, 527, [C1]. https://doi.org/10.1051/0004-6361/201014733e

Tafelmeyer, M., Jablonka, P., Hill, V., Shetrone, M., Tolstoy, E., Irwin, M. J., ... Szeifert, T. (2011). Extremely metal-poor stars in classical dwarf spheroidal galaxies: Fornax, Sculptor, and Sextans (Corrigendum). Astronomy and astrophysics, 527, C1. https://doi.org/10.1051/0004-6361/201014733e

Letarte, B., Hill, V., Tolstoy, E., Jablonka, P., Shetrone, M., Venn, K. A., ... Sadakane, K. (2011). VizieR Online Data Catalog: Individual stars in Fornax dSph center (Letarte+, 2010). VizieR Online Data Catalog, 352.

Williams, M. E. K., Steinmetz, M., Sharma, S., Bland-Hawthorn, J., de Jong, R. S., Seabroke, G. M., ... Zwitter, T. (2011). The Dawning of the Stream of Aquarius in RAVE. Astrophysical Journal, 728(2), [102]. https://doi.org/10.1088/0004-637X/728/2/102

Kordopatis, G., Recio-Blanco, A., de Laverny, P., Gilmore, G., Hill, V., Wyse, R. F. G., ... Bienaymé, O. (2011). A spectroscopic survey of the Thick Disc outside the Solar neighbourhood: A comparison with the Besançon model. In EAS Publications Series (Vol. 45, pp. 405-408) https://doi.org/10.1051/eas/1045070

Battaglia, G., Tolstoy, E., Helmi, A., Irwin, M., Parisi, P., Hill, V., & Jablonka, P. (2011). Study of the Sextans dwarf spheroidal galaxy from the DART Ca II triplet survey. Monthly Notices of the Royal Astronomical Society, 411(2), 1013-1034. https://doi.org/10.1111/j.1365-2966.2010.17745.x

Helmi, A. (2011). New (theoretical) Perspectives on the Galactic Halo. In C. Turon, F. Meynadier, & F. Arenou (Eds.), GAIA: At the Frontiers of Astrometry (pp. 319-324). (EAS Publications Series; Vol. 45). CEDEX A: E D P SCIENCES. https://doi.org/10.1051/eas/1045054

Kiss, L. L., Moor, A., Szalai, T., Kovacs, J., Bayliss, D., Gilmore, G. F., ... Zwitter, T. (2011). A search for new members of the beta Pictoris, Tucana-Horologium and epsilon Cha moving groups in the RAVE data base. Monthly Notices of the Royal Astronomical Society, 411(1), 117-123. https://doi.org/10.1111/j.1365-2966.2010.17660.x

Starkenburg, E., Hill, V., Tolstoy, E., Gonzalez Hernandez, J. I., Irwin, M., Helmi, A., ... de Boer, T. (2011). The Search for Extremely Low-Metallicity Stars in Dwarf Galaxies Using the NIR Ca II Triplet. In M. Koleva, P. Prugniel, & Vauglin (Eds.), CRAL-2010: A Universe of Dwarf Galaxies (pp. 13-18). (EAS Publications Series; Vol. 48). E D P SCIENCES. https://doi.org/10.1051/eas/1148002

2010

Tafelmeyer, M., Jablonka, P., Hill, V., Shetrone, M., Tolstoy, E., Irwin, M. J., ... Szeifert, T. (2010). Extremely metal-poor stars in classical dwarf spheroidal galaxies: Fornax, Sculptor, and Sextans. Astronomy and astrophysics, 524, [A58]. https://doi.org/10.1051/0004-6361/201014733

Kordopatis, G., Recio-Blanco, A., de Laverny, P., Gilmore, G., Hill, V., Wyse, R. F. G., ... Valls-Gabaud, D. (2010). Characterization of the thick disc properties up to 8~kpc through a spectroscopic survey. In S. Boissier, M. Heydari-Malayeri, R. Samadi, & D. Valls-Gabaud (Eds.), SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics (pp. 365)

Tafelmeyer, M., Jablonka, P., Hill, V., Shetrone, M., Tolstoy, E., Irwin, M. J., ... Szeifert, T. (2010). Extremely metal-poor stars in classical dwarf spheroidal galaxies: Fornax, Sculptor, and Sextans. Astronomy & astrophysics, 524, [58]. https://doi.org/10.1051/0004-6361/201014733

Fulbright, J. P., Wyse, R. F. G., Ruchti, G. R., Gilmore, G. F., Grebel, E., Bienayme, O., ... Zwitter, T. (2010). The RAVE Survey: Rich in Very Metal-poor Stars. Astrophysical Journal Letters, 724(1), L104-L108. https://doi.org/10.1088/2041-8205/724/1/L104

Zwitter, T., Matijevic, G., Breddels, M. A., Smith, M. C., Helmi, A., Munari, U., ... Wyse, R. F. G. (2010). Distance determination for RAVE stars using stellar models: II. Most likely values assuming a standard stellar evolution scenario. Astronomy & astrophysics, 522, [54]. https://doi.org/10.1051/0004-6361/201014922

Zwitter, T., Matijevic, G., Breddels, M. A., Smith, M. C., Helmi, A., Munari, U., ... Wyse, R. F. G. (2010). Distance determination for RAVE stars: II. (Zwitter+, 2010). VizieR On-line Data Catalog, 352, 29054.

Gomez, F. A., Helmi, A., Brown, A. G. A., & Li, Y-S. (2010). On the identification of merger debris in the Gaia era. Monthly Notices of the Royal Astronomical Society, 408(2), 935-946. https://doi.org/10.1111/j.1365-2966.2010.17225.x

Ruchti, G. R., Fulbright, J. P., Wyse, R. F. G., Gilmore, G. F., Bienayme, O., Binney, J., ... Zwitter, T. (2010). Origins of the Thick Disk as Traced by the Alpha Elements of Metal-poor Giant Stars Selected from Rave. Astrophysical Journal Letters, 721, L92-L96. https://doi.org/10.1088/2041-8205/721/2/L92

Helmi, A. (2010). Stellar Halos: Unmasking a Galaxy's History. In D. L. Block, K. C. Freeman, & I. Puerari (Eds.), Galaxies and their Masks: A Conference in Honour of K.C. Freeman, FRS (pp. 327-338). New York: Springer. https://doi.org/10.1007/978-1-4419-7317-7_28

Villalobos, Á., Kazantzidis, S., & Helmi, A. (2010). Thick-disk Evolution Induced by the Growth of an Embedded Thin Disk. Astrophysical Journal, 718(1), 314-330. https://doi.org/10.1088/0004-637X/718/1/314

Balcells, M., Benn, C. R., Carter, D., Dalton, G. B., Trager, S. C., Feltzing, S., ... Westhall, K. B. (2010). Design drivers for a wide-field multi-object spectrograph for the William Herschel Telescope. In Proceedings of the SPIE (Vol. 7735, pp. 242). [77357G] (Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series). https://doi.org/10.1117/12.856947

Matijevič, G., Zwitter, T., Munari, U., Bienaymé, O., Binney, J., Bland-Hawthorn, J., ... Wyse, R. F. G. (2010). Double-lined Spectroscopic Binary Stars in the Radial Velocity Experiment Survey. The Astronomical Journal, 140(1), 184-195. https://doi.org/10.1088/0004-6256/140/1/184

Breddels, M. A., Smith, M. C., Helmi, A., Bienayme, O., Binney, J., Bland-Hawthorn, J., ... Zwitter, T. (2010). RAVE DR2 distance catalogue (Breddels+, 2010). VizieR On-line Data Catalog, 351, 19090.

Cooper, A. P., Cole, S., Frenk, C. S., White, S. D. M., De Lucia, G., Helmi, A., ... Wang, J. (2010). Galactic Stellar Haloes in the CDM Model. In American Institute of Physics Conference Series (pp. 293-294) https://doi.org/10.1063/1.3458514

Starkenburg, E., Hill, V., Tolstoy, E., Gonzalez Hernandez, J. I., Irwin, M., Helmi, A., ... de Boer, T. (2010). The NIR Ca II triplet at low metallicity: Searching for extremely low-metallicity stars in classical dwarf galaxies. Astronomy & astrophysics, 513, A34. [34]. https://doi.org/10.1051/0004-6361/200913759

Navarro, J. F., Ludlow, A., Springel, V., Wang, J., Vogelsberger, M., White, S. D. M., ... Helmi, A. (2010). The diversity and similarity of simulated cold dark matter haloes. Monthly Notices of the Royal Astronomical Society, 402(1), 21-34. https://doi.org/10.1111/j.1365-2966.2009.15878.x

Gomez, F. A., & Helmi, A. (2010). On the identification of substructure in phase space using orbital frequencies. Monthly Notices of the Royal Astronomical Society, 401(4), 2285-2298. https://doi.org/10.1111/j.1365-2966.2009.15841.x

Breddels, M. A., Smith, M. C., Helmi, A., Bienaymé, O., Binney, J., Bland-Hawthorn, J., ... Zwitter, T. (2010). Distance determination for RAVE stars using stellar models. Astronomy & astrophysics, 511, [A90]. https://doi.org/10.1051/0004-6361/200912471

Li, Y-S., De Lucia, G., & Helmi, A. (2010). On the nature of the Milky Way satellites. Monthly Notices of the Royal Astronomical Society, 401(3), 2036-2052. https://doi.org/10.1111/j.1365-2966.2009.15803.x

Zwitter, T., Matijevi, G., Breddels, M. A., Smith, M. C., & Helmi, A. (2010). Distance determination for RAVE stars using stellar models. II Most likely values assuming a standard stellar evolution scenario. Astronomy & astrophysics, 522(2).

Sales, L. V., Helmi, A., & Battaglia, G. (2010). The Effect of Tidal Stripping on Composite Stellar Populations in Dwarf Spheroidal Galaxies. Advances in Astronomy, 2010, [194345]. https://doi.org/10.1155/2010/194345

Helmi, A. (2010). Dynamics and history of the Milky Way. In IF. Corbett (Ed.), Highlights of Astronomy (Vol. 15, pp. 176-177). (IAU Symposium Proceedings Series; Vol. 15). CAMBRIDGE: Cambridge University Press. https://doi.org/10.1017/S1743921310008598

Letarte, B., Hill, V., Tolstoy, E., Jablonka, P., Shetrone, M., Venn, K. A., ... Sadakane, K. (2010). A high-resolution VLT/FLAMES study of individual stars in the centre of the Fornax dwarf spheroidal galaxy. Astronomy & astrophysics, 523, [17]. https://doi.org/10.1051/0004-6361/200913413

Cooper, A. P., Cole, S., Frenk, C. S., White, S. D. M., Helly, J., Benson, A. J., ... Wang, J. (2010). Galactic stellar haloes in the CDM model. Monthly Notices of the Royal Astronomical Society, 406(2), 744-766. https://doi.org/10.1111/j.1365-2966.2010.16740.x

2009

Sales, L. V., Helmi, A., Abadi, M. G., Brook, C. B., Gomez, F. A., Roskar, R., ... Villalobos, A. (2009). Orbital eccentricity as a probe of thick disc formation scenarios. Monthly Notices of the Royal Astronomical Society, 400(1), L61-L65. https://doi.org/10.1111/j.1745-3933.2009.00763.x

Villalobos, A., & Helmi, A. (2009). Simulations of minor mergers - II. The phase-space structure of thick discs. Monthly Notices of the Royal Astronomical Society, 399(1), 166-176. https://doi.org/10.1111/j.1365-2966.2009.15085.x

Sales, L. V., Navarro, J. F., Schaye, J., Dalla Vecchia, C., Springel, V., Haas, M. R., & Helmi, A. (2009). The origin of extended disc galaxies at z=2. Monthly Notices of the Royal Astronomical Society, 399(1), L64-L68. https://doi.org/10.1111/j.1745-3933.2009.00725.x

Munari, U., Siviero, A., Bienayme, O., Binney, J., Bland-Hawthorn, J., Campbell, R., ... Zwitter, T. (2009). RAVE spectroscopy of luminous blue variables in the Large Magellanic Cloud. Astronomy & astrophysics, 503(2), 511-520. https://doi.org/10.1051/0004-6361/200912398

Aoki, W., Arimoto, N., Sadakane, K., Tolstoy, E., Battaglia, G., Jablonka, P., ... Babusiaux, C. (2009). Chemical composition of extremely metal-poor stars in the Sextans dwarf spheroidal galaxy. Astronomy & astrophysics, 502(2), 569-U208. https://doi.org/10.1051/0004-6361/200911959

Li, Y-S., Helmi, A., De Lucia, G., & Stoehr, F. (2009). On the common mass scale of the Milky Way satellites. Monthly Notices of the Royal Astronomical Society, 397(1), L87-L91. https://doi.org/10.1111/j.1745-3933.2009.00690.x

Revaz, Y., Jablonka, P., Sawala, T., Hill, V., Letarte, B., Irwin, M., ... Venn, K. A. (2009). The dynamical and chemical evolution of dwarf spheroidal galaxies. Astronomy & astrophysics, 501(1), 189-U241. https://doi.org/10.1051/0004-6361/200911734

Starkenburg, E., Helmi, A., Morrison, H. L., Harding, P., van Woerden, H., Mateo, M., ... Oravetz, D. (2009). MAPPING THE GALACTIC HALO. VIII. QUANTIFYING SUBSTRUCTURE. Astrophysical Journal, 698(1), 567-579. https://doi.org/10.1088/0004-637X/698/1/567

Vogelsberger, M., Helmi, A., Springel, V., White, S. D. M., Wang, J., Frenk, C. S., ... Navarro, J. F. (2009). Phase-space structure in the local dark matter distribution and its signature in direct detection experiments. Monthly Notices of the Royal Astronomical Society, 395(2), 797-811. https://doi.org/10.1111/j.1365-2966.2009.14630.x

Morrison, H. L., Helmi, A., Sun, J., Liu, P., Gu, R., Norris, J. E., ... Van Duyne, J. (2009). FASHIONABLY LATE? BUILDING UP THE MILKY WAY'S INNER HALO. Astrophysical Journal, 694(1), 130-143. https://doi.org/10.1088/0004-637X/694/1/130

Sales, L. V., Navarro, J. F., Helmi, A., Schaye, J., Dalla Vecchia, C., & Springel, V. (2009). Simulated disk galaxies at z = 2 in OWLS. In J. Andersen, J. Bland- Hawthorn, & B. Nordström (Eds.), The Galaxy Disk in Cosmological Context (pp. 68). (Proceedings of the International Union Symposia and Colloquia; Vol. 254). Cambridge University Press.

Villalobos, A., & Helmi, A. (2009). Formation of thick disks. In J. Andersen, J. Bland-Hawthorn, & B. Nordström (Eds.), The Galaxy Disk in Cosmological Context: Proceedings of the International Astronomical Union Symposia and Colloquia (pp. 76). (Proceedings of the International Astronomical Union Symposia and Colloquia; Vol. 254). Cambridge University Press.

Shaya, E., Olling, R., Ricotti, M., Majewski, S. R., Patterson, R. J., Allen, R., ... Tully, R. B. (2009). Properties of Dark Matter Revealed by Astrometric Measurements of the Milky Way and Local Galaxies. Manuscript submitted for publication. In Astro2010: The Astronomy and Astrophysics Decadal Survey (Vol. 2010, pp. 274)

Ludlow, A. D., Navarro, J. F., Springel, V., Jenkins, A., Frenk, C. S., & Helmi, A. (2009). THE UNORTHODOX ORBITS OF SUBSTRUCTURE HALOS. Astrophysical Journal, 692(1), 931-941. https://doi.org/10.1088/0004-637X/692/1/931

Ferdosi, B. J., Buddelmeijer, H., Helmi, A., Trager, S. C., Valentijn, E. A., Wilkinson, M. H. F., ... Roerdink, J. B. T. M. (2009). Comparison of Density Estimation Methods for Astronomical Datasets.

Li, Y-S., & Helmi, A. (2009). Group infall of substructures on to a Milky Way-like dark halo. In J. Andersen, J. BlandHawthorn, & B. Nordstrom (Eds.), GALAXY DISK IN COSMOLOGICAL CONTEXT, PROCEEDINGS OF THE 254TH SYMPOSIUM OF THE IAU (pp. 263-268). (IAU Symposium Proceedings Series; Vol. 4). CAMBRIDGE: Cambridge University Press. https://doi.org/10.1017/S1743921308027683

Gómez, F. A., & Helmi, A. (2009). On the identification of substructures in phase-space orbital frequencies. Default journal.

Battaglia, G., Helmi, A., Tolstoy, E., & Irwin, M. (2009). The mass content of the Sculptor dwarf spheroidal galaxy. In J. Andersen, J. BlandHawthorn, & B. Nordstrom (Eds.), GALAXY DISK IN COSMOLOGICAL CONTEXT, PROCEEDINGS OF THE 254TH SYMPOSIUM OF THE IAU (pp. 61-66). (IAU Symposium Proceedings Series; Vol. 4). CAMBRIDGE: Cambridge University Press. https://doi.org/10.1017/S1743921308027397

2008

Springel, V., Wang, J., Vogelsberger, M., Ludlow, A., Jenkins, A., Helmi, A., ... White, S. D. M. (2008). The Aquarius Project: the subhaloes of galactic haloes. Monthly Notices of the Royal Astronomical Society, 391(4), 1685-1711. https://doi.org/10.1111/j.1365-2966.2008.14066.x

Turon, C., Primas, F., Binney, J., Chiappini, C., Drew, J., Helmi, A., ... Ryan, S. G. (2008). The ESA ESO Working Group on Galactic Populations, Chemistry and Dynamics. The Messenger, 134, 46-49.

Navarro, J. F., Abadi, M., Steinmetz, M., Meza, A., Ludlow, A., Helmi, A., ... Sales, L. Cosmological giants and elves: galaxy formation and the small scale of cold dark matter.

Siebert, A., Bienayme, O., Binney, J., Bland-Hawthorn, J., Campbell, R., Freeman, K. C., ... Zwitter, T. (2008). Estimation of the tilt of the stellar velocity ellipsoid from RAVE and implications for mass models. Monthly Notices of the Royal Astronomical Society, 391(2), 793-801. https://doi.org/10.1111/j.1365-2966.2008.13912.x

Villalobos, Á., & Helmi, A. (2008). Simulations of minor mergers. I. General properties of thick disks. Monthly Notices of the Royal Astronomical Society, 391(4), 1806-1827. https://doi.org/10.1111/j.1365-2966.2008.13979.x

De Lucia, G., & Helmi, A. (2008). The Galaxy and its stellar halo: Insights on their formation from a hybrid cosmological approach. Monthly Notices of the Royal Astronomical Society, 391(1), 14-31. https://doi.org/10.1111/j.1365-2966.2008.13862.x

Springel, V., White, S. D. M., Frenk, C. S., Navarro, J. F., Jenkins, A., Vogelsberger, M., ... Helmi, A. (2008). Prospects for detecting supersymmetric dark matter in the Galactic halo. Nature, 456(7218), 73-76. https://doi.org/10.1038/nature07411

Veltz, L., Bienaymé, O., Steinmetz, M., Zwitter, T., Watson, F. G., Binney, J., ... Wyse, R. F. G. (2008). Galactic kinematics from RAVE to Gaia-RVS Data. In SF2A-2008 (pp. 47). Société Francaise d’Astronomie et d’Astrophysique (SF2A).

Okamoto, S., Arimoto, N., Yamada, Y., Onodera, M., Tolstoy, E., Irwin, M., ... Abel, T. (2008). The Star Formation History and Stellar Population Structures in the Sextans Dwarf Spheroidal Galaxy. In T. Kodama, T. Yamada, & K. Aoki (Eds.), Panoramic Views of Galaxy Formation and Evolution (pp. 469). (Astronomical Society of the Pacific Conference Series; Vol. 399). the University of Michigan: ASP.

Sales, L. V., Helmi, A., Starkenburg, E., Morrison, H. L., Engle, E., Harding, P., ... Sivarani, T. (2008). On the genealogy of the Orphan Stream. Monthly Notices of the Royal Astronomical Society, 389(3), 1391-1398. https://doi.org/10.1111/j.1365-2966.2008.13659.x

Munari, U., Tomasella, L., Fiorucci, M., Bienayme, O., Binney, J., Bland-Hawthorn, J., ... Zwitter, T. (2008). Diffuse interstellar bands in RAVE survey spectra. Astronomy & astrophysics, 488(3), 969-U61. https://doi.org/10.1051/0004-6361:200810232

Battaglia, G., Helmi, A., Tolstoy, E., Irwin, M., Hill, V., & Jablonka, P. (2008). The kinematic status and mass content of the sculptor dwarf spheroidal galaxy. Astrophysical Journal Letters, 681(1), L13-L16. https://doi.org/10.1086/590179

Zwitter, T., Siebert, A., Munari, U., Freeman, K. C., Siviero, A., Watson, F. G., ... De Boer, E. W. (2008). The Radial Velocity Experiment (RAVE): Second data release. The Astronomical Journal, 136(1), 421-451. https://doi.org/10.1088/0004-6256/136/1/421

Williams, M. E. K., Freeman, K. C., Helmi, A., & Collaboration, RAVE. (2008). The Arcturus Moving Group: Its Place in the Galaxy. In J. Andersen, J. Bland-Hawthorn , & B. Nordström (Eds.), The Galaxy Disk in Cosmological Context (Vol. 4, pp. 139-144). (Proceedings of the International Astronomical Union; Vol. 4, No. 254). Cambridge University Press. https://doi.org/10.1017/S1743921308027518

Helmi, A. (2008). The stellar halo of the Galaxy. Astronomy and Astrophysics Review, 15(3), 145-188. https://doi.org/10.1007/s00159-008-0009-6

Li, Y-S., & Helmi, A. (2008). Infall of substructures on to a Milky Way-like dark halo. Monthly Notices of the Royal Astronomical Society, 385(3), 1365-1373. https://doi.org/10.1111/j.1365-2966.2008.12854.x

Vogelsberger, M., White, S. D. M., Helmi, A., & Springel, V. (2008). The fine-grained phase-space structure of cold dark matter haloes. Monthly Notices of the Royal Astronomical Society, 385(1), 236-254. https://doi.org/10.1111/j.1365-2966.2007.12746.x

Veltz, L., Bienayme, O., Freeman, K. C., Binney, J., Bland-Hawthorn, J., Gibson, B. K., ... Zwitter, T. (2008). Galactic kinematics with RAVE data - I. The distribution of stars towards the Galactic poles. Astronomy & astrophysics, 480(3), 753-765. https://doi.org/10.1051/0004-6361:20066948

Seabroke, G. M., Gilmore, G., Siebert, A., Bienayme, O., Binney, J., Bland-Hawthorn, J., ... Williams, A. (2008). Is the sky falling? Searching for stellar streams in the local Milky Way disc in the CORAVEL and RAVE surveys. Monthly Notices of the Royal Astronomical Society, 384(1), 11-32. https://doi.org/10.1111/j.1365-2966.2007.12513.x

Battaglia, G., Irwin, M., Tolstoy, E., Hill, V., Helmi, A., Letarte, B., & Jablonka, P. (2008). Analysis and calibration of CaII triplet spectroscopy of red giant branch stars from VLT/FLAMES observations. Monthly Notices of the Royal Astronomical Society, 383(1), 183-199. https://doi.org/10.1111/j.1365-2966.2007.12532.x

Vogelsberger, M., Helmi, A., Springel, V., White, S. D. M., Wang, J., Frenk, C. S., ... Navarro, J. F. (2008). Phase-space structure in the local dark matter distribution and its signature in direct detection experiments. Nature, 456(7218).

Springel, V., White, S. D. M., Frenk, C. S., Navarro, J. F., Jenkins, A., Vogelsberger, M., ... Helmi, A. (2008). A blueprint for detecting supersymmetric dark matter in the Galactic halo. Nature, 456(7218).

Ferdosi, B. J., Buddelmeijer, H., Helmi, A., Trager, S. C., Valentijn, E. A., Wilkinson, M. H. F., ... Roerdink, J. B. T. M. (2008). Visualizing Astronomical Data. Poster session presented at SIREN: Scientific ICT Research Event Netherlands, 29 September 2008, VU Amsterdam, 2008. Poster., Amsterdam, Netherlands.

2007

Kepley, A. A., Morrison, H. L., Helmi, A., Kinman, T. D., Van Duyne, J., Martin, J. C., ... Freeman, K. C. (2007). Halo star streams in the solar neighborhood. The Astronomical Journal, 134(4), 1579-1595.

Helmi, A. (2007). Dynamics of substructures: On survivors and debris. In Dynamics of Galaxies (pp. 10)

Smith, M. C., Ruchti, G. R., Helmi, A., Wyse, R. F. G., Fulbright, J. P., Freeman, K. C., ... Zwitter, T. (2007). The RAVE survey: constraining the local Galactic escape speed. Monthly Notices of the Royal Astronomical Society, 379(2), 755-772. https://doi.org/10.1111/j.1365-2966.2007.11964.x

Stoeger, W. R., Helmi, A., & Torres, D. F. (2007). Averaging Einstein's equations: The linearized case. International Journal of Modern Physics D, 16(6), 1001-1026.

Ripamonti, E., Tolstoy, E., Helmi, A., Battaglia, G., & Abel, T. (2007). Numerical simulations of the metallicity distribution in dwarf spheroidal galaxies. In E. Emsellem, H. Wozniak, G. Massacrier, JF. Gonzalez, J. Devriendt, & N. Champavert (Eds.), CRAL-2006 Chemodynamics: From First Stars to Local Galaxies (pp. 15-20). (EAS PUBLICATIONS SERIES; Vol. 24). CEDEX A: E D P SCIENCES. https://doi.org/10.1051/eas:2007051

Tolstoy, E., Battaglia, G., Helmi, A., Irwin, M. J., & Hill, V. (2007). The dwarf spheroidal galaxies around the milky way. In A. Vallenari, R. Tantalo, L. Portinari, & A. Moretti (Eds.), FROM STARS TO GALAXIES: BUILDING THE PIECES TO BUILD UP THE UNIVERSE (pp. 215-220). (ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES; Vol. 374). SAN FRANCISCO: ASTRONOMICAL SOC PACIFIC.

Battaglia, G., Helmi, A., Tolstoy, E., & Irwin, M. J. (2007). Kinematic modelling of the Sculptor dwarf spheroidal galaxy. In A. Vallenari, R. Tantalo, L. Portinari, & A. Moretti (Eds.), FROM STARS TO GALAXIES: BUILDING THE PIECES TO BUILD UP THE UNIVERSE (pp. 273-274). (ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES; Vol. 374). SAN FRANCISCO: ASTRONOMICAL SOC PACIFIC.

2006

Helmi, A., Irwin, M. J., Tolstoy, E., Battaglia, G., Hill, V., Jablonka, P., ... Szeifert, T. (2006). A new view of the Dwarf spheroidal satellites of the Milky Way from VLT FLAMES: Where are the very metal-poor stars? Astrophysical Journal, 651(2), L121-L124.

Battaglia, G., Tolstoy, E., Helmi, A., Irwin, M. J., Letarte, B., Jablonka, P., ... Sadakane, K. (2006). The DART imaging and CaT survey of the Fornax dwarf spheroidal galaxy. Astronomy & astrophysics, 459(2), 423-U148. https://doi.org/10.1051/0004-6361:20065720

Steinmetz, M., Zwitter, T., Siebert, A., Watson, F. G., Freeman, K. C., Munari, U., ... Helmi, A. (2006). The Radial Velocity Experiment (RAVE): First data release. The Astronomical Journal, 132(4), 1645-1668.

Battaglia, G., Helmi, A., Morrison, H., Harding, P., Olszewski, E. W., Mateo, M., ... Shectman, S. A. (2006). Erratum: The radial velocity dispersion profile of the Galactic halo: constraining the density profile of the dark halo of the Milky Way. Monthly Notices of the Royal Astronomical Society, 370(2), 1055-1056. https://doi.org/10.1111/j.1365-2966.2006.10688.x

Smith, M. C., Ruchti, G. R., Helmi, A., & Wyse, R. F. G. (2006). The RAVE Survey: Using the local escape velocity to determine the mass of the Milky Way. In IAU Joint Discussion (Vol. 13)

Tolstoy, E., Hill, V., Irwin, M., Helmi, A., Battaglia, G., Letarte, B., ... Sadakane, K. (2006). The Dwarf galaxy Abundances and Radial-velocities Team (DART) Large Programme - A Close Look at Nearby Galaxies. The Messenger, 123, 33.

Helmi, A., Navarro, J. F., Nordstrom, B., Holmberg, J., Abadi, M. G., & Steinmetz, M. (2006). Pieces of the puzzle: ancient substructure in the Galactic disc. Monthly Notices of the Royal Astronomical Society, 365(4), 1309-1323. https://doi.org/10.1111/j.1365-2966.2005.09818.x

Williams, M., Freeman, K., Helmi, A., & Bland Hawthorn, J. (2006). The Arcturus Moving Group with RAVE. In Bernard's Cosmic Stories: From Primordial Fluctuations to the Birth of Stars and Galaxies (pp. 82.1)

Helmi, A. (2006). On the absence of very metal-poor stars in the dwarf spheroidal satellites of the Milky Way. New views from DART. Memorie della Societa Astronomica Italiana, 77, 1111.

Ripamonti, E., Tolstoy, E., Helmi, A., Battaglia, G., & Abel, T. (2006). Numerical simulations of the metallicity distribution in dwarf spheroidal galaxies. In EPRINTS-BOOK-TITLE s.n..

Battaglia, G., Tolstoy, E., Helmi, A., Irwin, M., & DART Team (2006). Metallicities and kinematics for dwarf spheroidals in the local group. In S. Randich, & L. Pasquini (Eds.), Chemical Abundances and Mixing in Stars in the Milky Way and Its Satellites (pp. 260-261). (ESO ASTROPHYSICS SYMPOSIA). BERLIN: Springer.

2005

Ruchti, G., Smith, M. C., Freeman, K. C., Helmi, A., Navarro, J., Williams, M., ... Collaboration, RAVE. (2005). The RAVE Survey: The Galactic Escape Velocity. Bulletin of the American Astronomical Society, 123.01.

Battaglia, G., Helmi, A., Morrison, H., Harding, P., Olszewski, E. W., Mateo, M., ... Shectman, S. A. (2005). The radial velocity dispersion profile of the Galactic halo: constraining the density profile of the dark halo of the Milky Way. Monthly Notices of the Royal Astronomical Society, 364(2), 433-442. https://doi.org/10.1111/j.1365-2966.2005.09367.x

Williams, M., Freeman, K. C., Helmi, A., Navarro, J., & Collaboration, RAVE. (2005). The RAVE Survey: The Arcturus Moving Group. Bulletin of the American Astronomical Society, 37, 1367. [124.04].

Fiorentin, PR., Helmi, A., Lattanzi, MG., & Spagna, A. (2005). Structure in the motions of the fastest halo stars. Astronomy & astrophysics, 439(2), 551-558. https://doi.org/10.1051/0004-6361:20052911

Wilkinson, M. I., Vallenari, A., Turon, C., Munari, U., Katz, D., Bono, G., ... Viala, Y. (2005). Spectroscopic survey of the Galaxy with Gaia - II. The expected science yield from the Radial Velocity Spectrometer. Monthly Notices of the Royal Astronomical Society, 359(4), 1306-1335. https://doi.org/10.1111/j.1365-2966.2005.09012.x

Re Fiorentin, P., Spagna, A., Helmi, A., & Lattanzi, M. G. (2005). Kinematic Survey of Halo Stars from SDSS-DR2 with GSC2. In The Three-Dimensional Universe with Gaia (Vol. 576, pp. 711). ESA Science and Technology.

Helmi, A. (2005). The prolate shape of the galactic dark-matter halo. In NJC. Spooner, & Kudryavtsev (Eds.), Identification of Dark Matter (pp. 87-91). SINGAPORE: World Scientific Publishing.

2004

Tolstoy, E., Irwin, MJ., Helmi, A., Battaglia, G., Jablonka, P., Hill, N. V., ... Abel, T. (2004). Two distinct ancient components in the Sculptor dwarf spheroidal galaxy: First results from the dwarf abundances and radial velocities team. Astrophysical Journal, 617(2), L119-L122.

DART Team (2004). Kinematics and metallicity relations for dwarf galaxies in the Local Group. In Baryons in Dark Matter Halos: Proceedings of Science (pp. 54). SISSA.

Helmi, A., Navarro, J. F., Meza, A., Steinmetz, M., & Eke, V. R. (2004). The Nature of the Ring-Like Structure in the Outer Galactic Disk. In F. Prada, D. Martinez-Delgado, & J. Terence (Eds.), Satellites and Tidal Streams (pp. 87). (Astronomical Society of the Pacific Conference series; Vol. 327). Astronomical Society of the Pacific.

Helmi, A. (2004). Velocity trends in the debris of sagittarius and the shape of the dark matter halo of our galaxy. Astrophysical Journal, 610(2), L97-L100.

Re Fiorentin, P., Helmi, A., Lattanzi, M. G., & Spagna, A. (2004). More evidence of substructure in the motions of nearby halo stars. In A. Diaferio (Ed.), Outskirts of Galaxy Clusters: Intense Life in the Suburbs (Vol. 2004, pp. 508-510). Cambridge University Press. https://doi.org/10.1017/S1743921304001115

Helmi, A. (2004). Is the dark halo of our Galaxy spherical? Monthly Notices of the Royal Astronomical Society, 351(2), 643-648. https://doi.org/10.1111/j.1365-2966.2004.07812.x

Navarro, J. F., Helmi, A., & Freeman, K. C. (2004). The Extragalactic Origin of the Arcturus Group. The Astrophysical Journal, 601(1), L43-L46. https://doi.org/10.1086/381751

Navarro, JF., Helmi, A., & Freeman, KC. (2004). The extragalactic origin of the Arcturus group. Astrophysical Journal, 601(1), L43-L46.

Katz, D., Munari, U., Cropper, M., Zwitter, T., Thevenin, F., David, M., ... Winter, B. (2004). Spectroscopic survey of the Galaxy with Gaia: I. Design and performance of the Radial Velocity Spectrometer. Monthly Notices of the Royal Astronomical Society, 354(4), 1223-1238. https://doi.org/10.1111/j.1365-2966.2004.08282.x

Helmi, A. (2004). On the shape of the Galactic dark matter halo. Publications of the Astronomical Society of Australia, 21(2), 212-215. https://doi.org/10.1071/AS04032

2003

Helmi, A., Navarro, J. F., Meza, A., Steinmetz, M., & Eke, V. R. (2003). On the Nature of the Ringlike Structure in the Outer Galactic Disk. Astrophysical Journal Letters, 592(1), L25-L28. https://doi.org/10.1086/377364

Helmi, A. (2003). The phase-space structure of CDM halos and dark-matter direct detection experiments. In Revista Mexicana de Astronomia y Astrofisica Conference Series (Vol. 17, pp. 24-25). arXiv.

Morrison, H. L., Norris, J., Mateo, M., Harding, P., Olszewski, E. W., Shectman, S. A., ... Freeman, K. C. (2003). Mapping the Galactic Halo: VI. Spectroscopic Measures of Luminosity and Metallicity. The Astronomical Journal, 125(5), 2502-2520. https://doi.org/10.1086/374231

Helmi, A., White, S. D. M., & Springel, V. (2003). The phase-space structure of cold dark matter haloes: Insights into the Galactic halo. Monthly Notices of the Royal Astronomical Society, 339(3), 834-848. https://doi.org/10.1046/j.1365-8711.2003.06227.x

Helmi, A., Ivezi, Z., Prada, F., Pentericci, L., Rockosi, C. M., Schneider, D. P., ... Brinkmann, J. (2003). Selection of Metal-poor Giant Stars Using the Sloan Digital Sky Survey Photometric System. The Astrophysical Journal, 586(1), 195-200. https://doi.org/10.1086/367536

2002

Helmi, A., White, S. D., & Springel, V. (2002). The phase-space structure of a dark-matter halo: Implications for dark- matter direct detection experiments. Physical Review D, 66, 063502. https://doi.org/10.1103/PhysRevD.66.063502

Helmi, A. (2002). Signatures of galaxy mergers in the Milky Way: Here, there and everywhere. Astrophysics and Space Science, 281(1-2), 351-354. https://doi.org/10.1023/A:1019590831169

Helmi, A. (2002). Fossil structure in the galactic halo: Trying to reconstruct the formation history of the Milky Way. Europhysics News, 33(4), 117-119. https://doi.org/10.1051/epn:2002402

Helmi, A., Springel, V., & White, S. D. M. (2002). On the Phase-Space Structure of the Milky Way Dark-Matter Halo. In G. S. Da Costa, & H. Jerjen (Eds.), The Dynamics, Structure & History of Galaxies: A Workshop in Honour of Professor Ken Freeman (pp. 333). (Astronomical Society of the Pacific Conference Series; Vol. 273). Astronomical Society of the Pacific.

Stoughton, C., Lupton, R. H., Bernardi, M., Blanton, M. R., Burles, S., Castander, F. J., ... Peterson, R. S. (2002). Sloan Digital Sky Survey: Early Data Release. The Astronomical Journal, 123(1), 485-548. https://doi.org/10.1086/324741

Helmi, A. (2002). Mapping the Galactic Halo Today and in the Future. In EAS Publications Series (pp. 273-275). (EAS Publications Series; Vol. 2). EDP Sciences. https://doi.org/10.1051/eas:2002026

2001

Morrison, H., Mateo, M., Olszewski, E. W., Dohm-Palmer, R. C., Harding, P., Helmi, A., ... Shectman, S. A. (2001). Star Streams in the Milky Way Halo. Manuscript submitted for publication. In G. S. Da Costa, & H. Jerjen (Eds.), The Dynamics, Structure & History of Galaxies: A Workshop in Honour of Professor Ken Freeman (pp. 123). (Astronomical Society of the Pacific Conference Series; Vol. 273). ASP.

Mateo, M., Morrison, H., Olszewski, E., Dohm-Palmer, R., Harding, P., Freeman, K., ... Sneden, C. Substructure in the Galactic Halo -- The Imaging Survey.

1999

Cincotta, P. M., Helmi, A., Mendez, M., Nunez, J. A., & Vucetich, H. (1999). Astronomical time-series analysis -- II. A search for periodicity using the Shannon entropy. Monthly Notices of the Royal Astronomical Society, 302(3), 582-586. https://doi.org/10.1046/j.1365-8711.1999.02128.x

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10 januari 2019 16:17

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