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(log10J)=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.
@article{arxiv.1405.4914,
title = {Wino Dark Matter and Future dSph Observations},
author = {Biplob Bhattacherjee and Masahiro Ibe and Koji Ichikawa and Shigeki Matsumoto and Kohei Nishiyama},
journal= {arXiv preprint arXiv:1405.4914},
year = {2014}
}