| Issue |
A&A
Volume 619, November 2018
|
|
|---|---|---|
| Article Number | A46 | |
| Number of page(s) | 8 | |
| Section | Galactic structure, stellar clusters and populations | |
| DOI | https://doi.org/10.1051/0004-6361/201832652 | |
| Published online | 05 November 2018 | |
Dynamical constraints on a dark matter spike at the Galactic centre from stellar orbits
Laboratoire Univers & Particules de Montpellier (LUPM), CNRS & Université de Montpellier (UMR-5299), Place Eugène Bataillon, 34095 Montpellier Cedex 05, France
e-mail: thomas.lacroix@umontpellier.fr
Received:
16
January
2018
Accepted:
17
August
2018
In this work I use astrometric and spectroscopic data on the S2 star at the Galactic centre (GC) up to 2016 to derive specific constraints on the size of a dark matter (DM) spike around the central supermassive black hole Sgr A*. These limits are the best direct constraints on a DM spike at the GC for non-annihilating dark matter and exclude a spike with radius greater than a few tens of parsecs for cuspy outer halos and a few hundred parsecs for cored outer halos.
Key words: dark matter / Galaxy: center / celestial mechanics / black hole physics
© ESO 2018
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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