title: Fermi Large Area Telescope as a Galactic Supernovae Axionscope.
abstract: In a Galactic core-collapse supernova (SN), axionlike particles (ALPs) could be emitted via the Primakoff process and eventually convert into γ rays in the magnetic field of the Milky Way. From a data-driven sensitivity estimate, we find that, for a SN exploding in our Galaxy, the Fermi Large Area Telescope (LAT) would be able to explore the photon-ALP coupling down to g_{aγ}≃2×10^{-13}  GeV^{-1} for an ALP mass m_{a}≲10^{-9}  eV. These values are out of reach of next generation laboratory experiments. In this event, the Fermi LAT would probe large regions of the ALP parameter space invoked to explain the anomalous transparency of the Universe to γ rays, stellar cooling anomalies, and cold dark matter. If no γ-ray emission were to be detected, Fermi-LAT observations would improve current bounds derived from SN 1987A by more than 1 order of magnitude.
authors.affiliation: Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden.|The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Meyer
authors.affiliation: Physical Sciences, Barry University, 11300 NE 2nd Ave., Miami Shores, Florida 33161, USA.
authors.forename: M
authors.initials: M
authors.lastname: Giannotti
authors.affiliation: Dipartimento Interateneo di Fisica "Michelangelo Merlin", Via Amendola 173, 70126 Bari, Italy.|Istituto Nazionale di Fisica Nucleare-Sezione di Bari, Via Amendola 173, 70126 Bari, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Mirizzi
authors.affiliation: Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden.|The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm, Sweden.
authors.forename: J
authors.initials: J
authors.lastname: Conrad
authors.affiliation: Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden.|The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm, Sweden.
authors.forename: M A
authors.initials: MA
authors.lastname: Sánchez-Conde