Physics

Indirect Detection of Decaying Dark Matter with High Angular Resolution: Case for axion search by IRCS at Subaru Telescope

W. Yin and K. Hayashi

This groundbreaking research by Wen Yin and Kohei Hayashi delves into cosmic-ray flux from dark matter decay in dwarf spheroidal galaxies, presenting innovative differential D-factors to enhance signal detection. The study highlights the potential of the Infrared Camera and Spectrograph at the Subaru telescope to revolutionize dark matter detection, particularly for axion-like particles, suggesting that key observations could surpass existing stellar cooling bounds!

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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

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