Annihilation Radiation from a Dark Matter Spike at the Galactic Centre

2); Gianfranco Bertone (1; Guenter Sigl (2); Joseph Silk (1) ((1) Department of Astrophysics; University of Oxford; (2) Institut d'Astrophysique de Paris)

Annihilation Radiation from a Dark Matter Spike at the Galactic Centre

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arxiv astro-ph/0203488 v2 pith:GSWKSAXW submitted 2002-03-27 astro-ph hep-ph

Annihilation Radiation from a Dark Matter Spike at the Galactic Centre

Gianfranco Bertone (1 , 2) , Guenter Sigl (2) , Joseph Silk (1) ((1) Department of Astrophysics , University of Oxford; (2) Institut d'Astrophysique de Paris) This is my paper

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keywords centregalacticannihilationdarkdensitymatterprofileradiation

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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.

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