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
- NWO grant for Prof. Amina Helmi
- 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,
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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,
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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
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van
Oirschot, P., Starkenburg, E., Helmi, A., &
Nelemans, G. (2015). Building blocks of the Milky Way's
stellar halo. IAU General Assembly ,
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Helmi,
A. (2015). Galactic dynamics in the era of
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Helmi,
A. (2015). The connection between galaxy formation and
the assembly of stellar halos in the Local Group.
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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
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of the Spanish Astronomical Society held on September 8-12, 2014,
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Figueras, C. Hernández-Monteagudo, J. Trujillo Bueno, and L.
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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).
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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,
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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,
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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, 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
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).
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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
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R. (2004). The Nature of the Ring-Like Structure in the Outer
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galaxy. Astrophysical Journal,
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The Extragalactic Origin of the Arcturus Group.
The Astrophysical Journal, 601(1),
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JF., Helmi, A., & Freeman, KC. (2004). The
extragalactic origin of the Arcturus group.
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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
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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
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Journal, 586(1), 195-200. https://doi.org/10.1086/367536
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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
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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
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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
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Future. In EAS Publications Series (pp. 273-275).
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2001
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H., Mateo, M., Olszewski, E. W., Dohm-Palmer, R. C., Harding,
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1999
Cincotta,
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A., & Vucetich, H. (1999). Astronomical time-series
analysis -- II. A search for periodicity using the Shannon
entropy. Monthly Notices of the Royal Astronomical
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