D. A. D. Vaz, J. Brinchmann, B. Zoutendijk, N. Bouchť, M. Steinmetz
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.
Astrophysics - Cosmology and Nongalactic Astrophysics; Astrophysics - Astrophysics of Galaxies; High Energy Physics - Phenomenology
Physics Letters B
Volume 814, Number 1360, Page 11