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• W2137589209 abstract "Detecting the dark matter annihilation signal from Galactic substructure, or subhalos, is an important challenge for high-energy gamma-ray experiments. In this paper we discuss detection prospects by combining two different aspects of the gamma-ray signal: the angular distribution and the photon counts probability distribution function (PDF). The true PDF from subhalos has been shown recently (by Lee et al.) to deviate from Poisson; we extend this analysis and derive the signal PDF from a detailed $ensuremath{Lambda}mathrm{CDM}$-based model for the properties of subhalos. We combine our PDF with a model for Galactic and extra-Galactic diffuse gamma-ray emission to obtain an estimator and projected error on dark matter particle properties (mass and annihilation cross section) using the Fermi gamma-ray space telescope. We compare the estimator obtained from the true PDF to that obtained from the simpler Poisson analysis. We find that, although both estimators are unbiased in the presence of backgrounds, the error on dark matter properties derived from the true PDF is $ensuremath{sim}50%$ smaller than when utilizing the Poisson-based analysis." @default.
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• W2137589209 date "2010-12-06" @default.
• W2137589209 modified "2023-10-18" @default.
• W2137589209 title "Constraining dark matter in galactic substructure" @default.
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• W2137589209 doi "https://doi.org/10.1103/physrevd.82.123511" @default.
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