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                              G C N E W S
                             * Newsflash *

            - The Newsletter for Galactic Center Research -

gcnews@mpifr-bonn.mpg.de             http://www.mpifr-bonn.mpg.de/gcnews
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Vol. 10, No. 15                                              Sep 2, 1999


Recently submitted papers:
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Email    : gondolo@mppmu.mpg.de
Title    : Dark matter annihilation at the galactic center
Author(s): Paolo Gondolo(1), &  Joseph Silk(2)
Institute: (1) Max Planck Institut fuer Physik, Foehringer Ring 6,     
           80805 Munich, Germany,Email:gondolo@mppmu.mpg.de
           (2) Astrophysics, University of Oxford, Keble Road,   Oxford, 
           OX1 3RH, U.K.,   and,Department of Astronomy and Physics,    
           University of California, Berkeley, CA 94720,   
           Email: silk@astro.ox.ac.uk
Paper    : Physical Review Letters, 30 August

Abstract:
If cold dark matter is present at the galactic center, as in current
models of the dark halo, it is accreted by the central black hole into
a dense spike. Particle dark matter then annihilates strongly inside
the spike, making it a compact source of photons, electrons,
positrons, protons, antiprotons, and neutrinos. The spike luminosity
depends on the density profile of the inner halo: halos with finite
cores have unnoticeable spikes, while halos with inner cusps may have
spikes so bright that the absence of a detected neutrino signal from
the galactic center already places interesting upper limits on the
density slope of the inner halo.  Future neutrino telescopes observing
the galactic center could probe the inner structure of the dark halo,
or indirectly find the nature of dark matter.
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(Older versions of the Newsflash can be found at the gcnews web-page)
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			       Edited by
Angela Cotera                                Heino Falcke
(cotera@ipac.caltech.edu)                    (hfalcke@mpifr-bonn.mpg.de)
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