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- W1963805676 endingPage "061" @default.
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- W1963805676 abstract "Cross-correlating the gamma-ray background with local galaxy catalogs potentially gives stringent constraints on dark matter annihilation. We provide updated theoretical estimates of sensitivities to the annihilation cross section from gamma-ray data with Fermi telescope and 2MASS galaxy catalogs, by elaborating the galaxy power spectrum and astrophysical backgrounds, and adopting the Markov-Chain Monte Carlo simulations. In particular, we show that taking tomographic approach by dividing the galaxy catalogs into more than one redshift slice will improve the sensitivity by a factor of a few to several. If dark matter halos contain lots of bright substructures, yielding a large annihilation boost (e.g., a factor of ∼100 for galaxy-size halos), then one may be able to probe the canonical annihilation cross section for thermal production mechanism up to masses of ∼700 GeV. Even with modest substructure boost (e.g., a factor of ∼10 for galaxy-size halos), on the other hand, the sensitivities could still reach a factor of three larger than the canonical cross section for dark matter masses of tens to a few hundreds of GeV." @default.
- W1963805676 created "2016-06-24" @default.
- W1963805676 creator A5044567744 @default.
- W1963805676 date "2014-10-24" @default.
- W1963805676 modified "2023-10-10" @default.
- W1963805676 title "Power spectrum tomography of dark matter annihilation with local galaxy distribution" @default.
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- W1963805676 doi "https://doi.org/10.1088/1475-7516/2014/10/061" @default.
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