Impact of astrophysical processes on the gamma-ray background from dark matter annihilations

Details Impact of astrophysical processes on the gamma-ray background from dark matter annihilations Impact of astrophysical processes on the gamma-ray background from dark matter annihilations

2007-03-09

arxiv.org/abs/astro-ph/0703236v2

Phys.Rev.D76:023517,2007

Astronomy and Astrophysics

Astrophysics

12 pages 8 figures, version accepted for publication in PRD

Scientific paper

10.1103/PhysRevD.76.023517

We study the impact of astrophysical processes on the gamma-ray background produced by the annihilation of dark matter particles in cosmological halos, with particular attention to the consequences of the formation of supermassive black holes. In scenarios where these objects form adiabatically from the accretion of matter on small seeds, dark matter is first compressed into very dense ``spikes'', then its density progressively decreases due to annihilations and scattering off of stellar cusps. With respect to previous analyses, based on non-evolving halos, the predicted annihilation signal is higher and significantly distorted at low energies, reflecting the large contribution to the total flux from unevolved spikes at high redshifts. The peculiar spectral feature arising from the specific redshift distribution of the signal, would discriminate the proposed scenario from more conventional astrophysical explanations. We discuss how this affects the prospects for detection and demonstrate that the gamma-ray background from DM annihilations might be detectable even in absence of a signal from the Galactic center.

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