Searching for light in the darkness: Bounds on ALP dark matter with the optical MUSE-faint survey
Abstract
We use MUSE spectroscopic observations of the dwarf spheroidal galaxy Leo T between 470 and 935 nm to search for radiative decays of axion like particles (ALPs). Under the assumption that ALPs constitute the dark matter component of the Leo T halo, we derive bounds on the effective ALP-two-photon coupling. We improve existing limits by more than one order of magnitude in the ALP mass range 2.7-5.3 eV.
- Publication:
-
Physics Letters B
- Pub Date:
- March 2021
- DOI:
- 10.1016/j.physletb.2021.136075
- arXiv:
- arXiv:2009.01310
- Bibcode:
- 2021PhLB..81436075R
- Keywords:
-
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- Astrophysics - Astrophysics of Galaxies;
- High Energy Physics - Phenomenology
- E-Print:
- 11 pages, 5 figures. v2: minor revision, matching the version to appear in PLB