Astrophysical Limits on Massive Dark Matter

G.Bertone1,2, G.Sigl1, J.Silk2

(1) Institut d'Astrophysique, F-75014 Paris, France,
(2) Department of Astrophysics, University of Oxford, NAPL Keble Road, Oxford OX13RH, United Kingdom

Paper: MNRAS, submitted

EPrint Server: astro-ph/0101134


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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