Wino Dark Matter and Future dSph Observations

TL;DR

This paper explores the potential of future gamma-ray observations of dwarf spheroidal galaxies to detect or constrain wino dark matter, emphasizing the importance of astrophysical uncertainties and improved J-factor measurements.

Contribution

It provides a detailed analysis of how upcoming gamma-ray telescopes can improve constraints on wino dark matter, highlighting the role of J-factor uncertainties.

Findings

Future gamma-ray telescopes can cover the entire wino mass range with improved J-factors.

Reducing J-factor uncertainties to 0.1 dex enables comprehensive wino dark matter searches.

Long-term observations (10-15 years) are crucial for probing the full wino mass spectrum.

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 $\delta (\log_{10}J) = 0.1$ 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.