Helmi, Prof. Amina
Amina Helmi (1970) is Professor of Dynamics, Structure and Formation of the Milky Way. Helmi wrote a groundbreaking PhD thesis (for which she was awarded the 2004 Christiaan Huygens Prize), shedding new light on the history and formation of the Milky Way by stating that it probably gradually merged with smaller galaxies. Helmi is searching for these separate galaxies (‘fossils’) and is thus a sort of astro-archaeologist, using the information from star fossils to reconstruct the formation of the Milky Way.
Helmi has been awarded a number of prestigious grants, including an NWO VIDI grant in 2003 and an ERC Starting Grant from the EU in 2009. She is an active member of numerous networks. In 2017 she has been elected as member of the KNAW, the Royal Netherlands Academy of Arts and Sciences. Helmi is closely involved with the GAIA telescope, launched in 2013, which is providing very precise measurements to chart the Milky Way. II 2014 a team of scientists, including Helmi, published the first map of the spatial distribution of the mysterious matter in the almost empty space between stars, in Science. In 2015 she was awarded a VICI grant for her research, and in 2017 an NWO grant. In 2018 she and her research group were one of the first to be given the opportunity to study a second set of data from Gaia missions. She discovered that the Milky Way swallowed a major star system 10 billion years ago.
In 2019 Helmi was awarded the Spinoza Prize, the highest academic award in the Netherlands. Besides the great honour, the winner of the Spinoza Prize receives a research budget of EUR 2.5 million.
Previously in the news
- Spinoza Prize 2019 for astronomer Amina Helmi
- 'Smoking gun'. Amina Helmi knew she would have to wait for Gaia
- Astronomers discover the giant that shaped the early days of our Milky Way
- Small galaxy caused ‘snail shell’ structure in our part of the Milky Way
- A sneak peek for Amina Helmi
- Helmi elected as member of the KNAW
- Astronomers over the moon with ‘a box full of chocolates’
- VICI Grant awarded to Helmi
- Helmi's inaugural lecture: the fascinating Milky Way
- Mysterious matter mapped
- 'I want to understand everything' (Helmi in Annual Review University of Groningen 2010, page 13)
-
Groningen astronomer Amina Helmi joint discoverer of new stellar stream in the Milky Way
2019
4MOST,
de Jong, R. S., Agertz, O., Agudo Berbel, A., Aird, J., Alexander,
D. A., ... Kuijken, K. (2019). 4MOST: Project overview and
information for the First Call for Proposals. ESO
Messenger, 175.
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: Kinematics of
globular clusters and dwarf galaxies around the Milky Way.
Astronomy & astrophysics, 616,
A12. [12]. https://doi.org/10.1051/0004-6361/201832698
Gaia
Collaboration (2018). Gaia Data Release 2: Observations of
solar system objects. Astronomy &
astrophysics, 616, [13]. https://doi.org/10.1051/0004-6361/201832900
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: The celestial
reference frame (Gaia-CRF2). Astronomy and
astrophysics, 616, [A14]. https://doi.org/10.1051/0004-6361/201832916
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
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
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
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
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
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
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
Gaia
Collaboration (2018). Gaia Data Release 2: Observational
Hertzsprung-Russell diagrams. Unpublished. https://doi.org/10.1051/0004-6361/201832843
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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(2),
L23-L27. 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). Galactic dynamics in the era of
Gaia. IAU General Assembly ,
22, 2257323.
Helmi,
A. (2015). The connection between galaxy formation and
the assembly of stellar halos in the Local Group.
IAU General Assembly , 22,
2255632.
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), 98-115. 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
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). 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)
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
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
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(5), 81-95. https://doi.org/10.1088/0004-6256/148/5/81
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
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
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(1),
51-77. 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
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(6198), 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
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
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
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.
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(1), L20-L25. https://doi.org/10.1088/2041-8205/781/1/L20
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
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
Antoja,
T., & Helmi, A. (2014). Constraints on the
Galactic bar with RAVE. In IAU Symposium (pp.
395-395) https://doi.org/10.1017/S1743921313006625
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
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). 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
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
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
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
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
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
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.
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)
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.
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
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
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
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
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
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)
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., ... 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
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
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.
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.
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
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.
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., 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
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.
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, [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). Individual stars in
Fornax dSph center (Letarte+, 2010). VizieR
On-line Data Catalog, 352, 39017.
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
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
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
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
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
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
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
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
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
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: II. (Zwitter+, 2010).
VizieR On-line Data Catalog, 352,
29054.
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
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
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
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.
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,
[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
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
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).
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
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
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
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
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
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
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
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.
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.
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
Navarro,
J. F., Abadi, M., Steinmetz, M., Meza, A., Ludlow, A., Helmi,
A., ... Sales, L. (2008, Dec 1). 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
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.
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
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).
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).
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.
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.
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.
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
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.
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)
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.
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..
2005
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].
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.
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.
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
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
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., 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
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
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). 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. (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). 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
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
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. (2001, Aug 1). 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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