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From: "Gianfranco Bertone"  bertone@iap.fr 
To: "Heino Falcke" <hfalcke@mpifr-bonn.mpg.de>
Cc: "Joseph Silk" <silk@astro.ox.ac.uk>, "Guenter Sigl" <sigl@iap.fr>
Subject: R: astro-ph/0203488
Date: Fri, 5 Apr 2002 17:37:48 +0200
X-Mailer: Microsoft Outlook Express 5.00.2615.200

\title{Annihilation Radiation from a Dark Matter Spike at the Galactic Centre}
\author{Gianfranco Bertone (1,2), Guenter Sigl (2), Joseph Silk (1) }
\inst{(1) Department of Astrophysics, University of Oxford;
(2) Institut d'Astrophysique de Paris}
\begin{abstract}
We study annihilation radiation of neutralinos in the Galactic centre,
assuming
the existence of a 'spike' in the dark matter density profile, due to
adiabatic
accretion onto the massive black hole lying at the Galactic centre. Under
this
assumption we find that it is possible to reproduce the observed SgrA*
emission
at radio and gamma-ray frequencies in a consistent scenario with a magnetic
field
close to the equipartition strength and with values of $\gamma$ (the density
profile
power law index) around 0.1.
\end{abstract}