The GALAH survey: no chemical evidence of an extragalactic origin for the Nyx stream
Article
Article Title | The GALAH survey: no chemical evidence of an extragalactic origin for the Nyx stream |
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ERA Journal ID | 45091 |
Article Category | Article |
Authors | Zucker, Daniel B. (Author), Simpson, Jeffrey D. (Author), Martell, Sarah L. (Author), Lewis, Geraint F. (Author), Casey, Andrew R. (Author), Ting, Yuan-Sen (Author), Horner, Jonathan (Author), Nordlander, Thomas (Author), Wyse, Rosemary F. G. (Author), Zwitter, Tomaz (Author), Bland-Hawthorn, Joss (Author), Buder, Sven (Author), Asplund, Martin (Author), de Silva, Gayandhi M. (Author), D'Orazi, Valentina (Author), Freeman, Ken C. (Author), Hayden, Michael R. (Author), Kos, Janez (Author), Lin, Jane (Author), Lind, Karin (Author), Schlesinger, Katharine J. (Author), Sharma, Sanjib (Author) and Stello, Dennis (Author) |
Journal Title | The Astrophysical Journal Letters |
Journal Citation | 912 (2), pp. 1-7 |
Article Number | L30 |
Number of Pages | 7 |
Year | 2021 |
Publisher | IOP Publishing |
Place of Publication | United Kingdom |
ISSN | 2041-8205 |
2041-8213 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/2041-8213/abf7cd |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/2041-8213/abf7cd |
Abstract | The results from the ESA Gaia astrometric mission and deep photometric surveys have revolutionized our knowledge of the Milky Way. There are many ongoing efforts to search these data for stellar substructure to find evidence of individual accretion events that built up the Milky Way and its halo. One of these newly identified features, called Nyx, was announced as an accreted stellar stream traveling in the plane of the disk. Using a combination of elemental abundances and stellar parameters from the GALAH and Apache Point Observatory Galactic Evolution Experiment (APOGEE) surveys, we find that the abundances of the highest likelihood Nyx members are entirely consistent with membership of the thick disk, and inconsistent with a dwarf galaxy origin. We conclude that the postulated Nyx stream is most probably a high-velocity component of the Milky Way's thick disk. With the growing availability of large data sets including kinematics, stellar parameters, and detailed abundances, the probability of detecting chance associations increases, and hence new searches for substructure require confirmation across as many data dimensions as possible. |
Keywords | Milky Way disk; Milky Way dynamics; galactic abundances; stellar; abundances; stellar streams; galaxy structure; 1050; 1051; 2002; 1577; 2166; 622; astrophysics; astrophysics of galaxies |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Macquarie University |
University of New South Wales | |
University of Sydney | |
Monash University | |
Institute for Advanced Study, United States | |
Centre for Astrophysics | |
Australian National University | |
Johns Hopkins University, United States | |
University of Ljubljana, Slovenia | |
Max Planck Society, Germany | |
National Institute for Astrophysics, Italy | |
Stockholm University, Sweden |
https://research.usq.edu.au/item/q67w0/the-galah-survey-no-chemical-evidence-of-an-extragalactic-origin-for-the-nyx-stream
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