Halo Geometry and Dark Matter Annihilation Signal

Details Halo Geometry and Dark Matter Annihilation Signal Halo Geometry and Dark Matter Annihilation Signal

2005-04-28

arxiv.org/abs/astro-ph/0504631v2

Phys.Rev. D72 (2005) 083503

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, PRD

Scientific paper

10.1103/PhysRevD.72.083503

We study the impact of the halo shape and geometry on the expected weakly interacting massive particle (WIMP) dark matter annihilation signal from the galactic center. As the halo profile in the innermost region is still poorly constrained, we consider different density behaviors like flat cores, cusps and spikes, as well as geometrical distortions. We show that asphericity has a strong impact on the annihilation signal when the halo profile near the galactic center is flat, but becomes gradually less significant for cuspy profiles, and negligible in the presence of a central spike. However, the astrophysical factor is strongly dependent on the WIMP mass and annihilation cross-section in the latter case.

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