Robust bounds on ALP dark matter from dwarf spheroidal galaxies in the optical MUSE-Faint survey
Journal of Cosmology and Astroparticle Physics(2023)
摘要
Nearby dwarf spheroidal galaxies are ideal targets in the search for indirect
dark matter (DM) signals. In this work, we analyze MUSE spectroscopic
observations of a sample of five galaxies, composed of both classical and
ultra-faint dwarf spheroidals. The goal is to search for radiative decays of
axion-like particles (ALPs) in the mass range of 2.7-5.3 eV. After taking into
account the uncertainties associated with the DM spatial distribution in the
galaxies, we derive robust bounds on the effective ALP-two-photon coupling.
They lie well below the QCD axion band and are significantly more constraining
than limits from other probes, in the relevant mass range. We also test the
possible presence of a positive signal, concluding that none of the channels
selected for this analysis, i.e., not affected by large background
contamination, is exhibiting such evidence.
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