Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-03-16
Phys.Rev.D80:083504,2009
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Matches published version, includes additional section with Galactic diffuse background
Scientific paper
10.1103/PhysRevD.80.083504
Annihilation of cosmologically distributed dark matter is predicted to produce a potentially observable flux of high energy photons. Neglecting the contribution from local structure, this signal is predicted to be virtually uniform on the sky and, in order to be identified, must compete with various extragalactic backgrounds. We focus here on unresolved blazars and discuss several techniques for separating the dark matter signal from this background. First, the spectral shapes of the signal and background are expected to differ, a feature which can be exploited with the Fisher Matrix formalism. Second, in any given angular pixel, the number of photons from blazars is drawn from a distribution which is far from Poisson. A knowledge of this distribution enhances one's ability to extract the dark matter signal, while ignorance of it can lead to the introduction of a large systematic error.
Dodelson Scott
Hooper Dan
Serpico Pasquale
~Belikov Alexander V.
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