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Abstract
This paper presents a comprehensive study of cosmic-ray flux from dark matter decay in dwarf spheroidal galaxies (dSphs), focusing on detectors with arcsecond-level resolution. The authors propose using differential D-factors, which are estimated for various dSphs, to enhance signal detection. They find that the signal flux can be enhanced by a factor of O(1-10) compared to traditional estimations. This analysis suggests the Infrared Camera and Spectrograph (IRCS) at the Subaru telescope is a promising dark matter detector for eV-range masses, particularly axion-like particles (ALPs). Observations of Draco or Ursa Major II with IRCS for a few nights could surpass stellar cooling bounds for ALPs with masses between 1 and 2 eV.
Publisher
arXiv preprint
Published On
May 24, 2023
Authors
Wen Yin, Kohei Hayashi
Tags
cosmic-ray flux
dark matter decay
dwarf spheroidal galaxies
axion-like particles
signal detection
differential D-factors
Infrared Camera and Spectrograph

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