Volume 619, November 2018
|Number of page(s)||8|
|Section||Galactic structure, stellar clusters and populations|
|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
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
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