Astrophysical Limits on Massive Dark Matter

Details Astrophysical Limits on Massive Dark Matter Astrophysical Limits on Massive Dark Matter

2001-01-09

arxiv.org/abs/astro-ph/0101134v1

Mon.Not.Roy.Astron.Soc. 326 (2001) 799-804

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures, submitted to MNRAS

Scientific paper

10.1046/j.1365-8711.2001.04650.x

Annihilations of weakly interacting dark matter particles provide an important signature for the possibility of indirect detection of dark matter in galaxy halos. These self-annihilations can be greatly enhanced in the vicinity of a massive black hole. We show that the massive black hole present at the centre of our galaxy accretes dark matter particles, creating a region of very high particle density. Consequently the annihilation rate is considerably increased, with a large number of $e^+e^-$ pairs being produced either directly or by successive decays of mesons. We evaluate the synchrotron emission (and self-absorption) associated with the propagation of these particles through the galactic magnetic field, and are able to constrain the allowed values of masses and cross sections of dark matter particles.

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