Prospects for annihilating dark matter from M31 and M33 observations with the Cherenkov Telescope Array
arxiv(2023)
摘要
M31 and M33 are the closest spiral galaxies and the largest members (together
with the Milky Way) of the Local group, which makes them interesting targets
for indirect dark matter searches. In this paper, we present studies of the
expected sensitivity of the Cherenkov Telescope Array (CTA) to an annihilation
signal from weakly interacting massive particles from M31 and M33. We show that
a 100 h long observation campaign will allow CTA to probe annihilation
cross-sections up to ⟨συ⟩≈ 5·10^-25
cm^3s^-1 for the τ^+τ^- annihilation channel (for M31, at a
DM mass of 0.3 TeV), improving the current limits derived by HAWC by up to an
order of magnitude. We present an estimate of the expected CTA sensitivity, by
also taking into account the contributions of the astrophysical background and
other possible sources of systematic uncertainty. We also show that CTA might
be able to detect the extended emission from the bulge of M31, detected at
lower energies by the Fermi/LAT.
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