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 DM 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.
@article{arxiv.1801.01308,
title = {Dynamical constraints on a dark matter spike at the Galactic Centre from stellar orbits},
author = {Thomas Lacroix},
journal= {arXiv preprint arXiv:1801.01308},
year = {2018}
}
Comments
8 pages, 5 figures. Matches version accepted in A&A. Details on the model in Appendix