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arXiv · 1405.4914

Wino Dark Matter and Future dSph Observations

Biplob Bhattacherjee·Masahiro Ibe·Koji Ichikawa·Shigeki Matsumoto·Kohei Nishiyama
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Abstract

We discuss the indirect detection of the wino dark matter utilizing gamma-ray observations of dwarf spheroidal galaxies (dSphs). After carefully reviewing current limits with particular attention to astrophysical uncertainties, we show prospects of the wino mass limit in future gamma-ray observation by the Fermi-LAT and the GAMMA-400 telescopes. We find that the improvement of the so-called $J$-factor of both the classical and the ultra-faint dSphs will play a crucial role to cover whole mass range of the wino dark matter. For example, with $δ(\log_{10}J) = 0.1$ for both the classical and the ultra-faint dSphs, whole wino dark matter mass range can be covered by 15 years and 10 years data at the Fermi-LAT and GAMMA-400 telescopes, respectively.

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Biplob Bhattacherjee, Masahiro Ibe, Koji Ichikawa, Shigeki Matsumoto, Kohei Nishiyama. 2014-10-02. Wino Dark Matter and Future dSph Observations. https://doi.org/10.1007/jhep07(2014)080

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