Robust bounds on ALP dark matter from dwarf spheroidal galaxies in the optical MUSE-Faint survey

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Todarello, E (Author) Other; Regis, M (Author) Other; Reynoso-Cordova, J (Author) Other; Taoso, M (Author) Other; Vaz, D (Author) Other; J. Brinchmann (Author) FCUP; Steinmetz, M (Author) Other; Zoutendijk, SL (Author) Other

Journal

Title: Journal of Cosmology and Astroparticle Physics

Vol. 2024

Final page: 043

ISSN: 1475-7516

Publisher: Institute of Physics Publishing

Indexing

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Other information

Authenticus ID: P-010-EGN

DOI: 10.1088/1475-7516/2024/05/043

Abstract (EN): 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 wavelength channels selected for this analysis, i.e., not affected by large background contamination, is exhibiting such evidence.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 19