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Communication Dans Un Congrès Année : 2021

Giant cosmic ray halos around M31 and the Milky Way

Sarah Recchia
  • Fonction : Auteur
Felix Aharonian
  • Fonction : Auteur

Résumé

Recently, a diffuse emission of 1-100 GeV 훾-rays has been detected from the direction of M31, extending up to 200 kpc from its center. The interpretation of the extended 훾−ray emission by the escape of cosmic rays produced in the galactic disk or in the galactic center is problematic. In this paper, we argue that a cosmic ray origin (either leptonic or hadronic) of the 훾-ray emission is possible in the framework of non standard cosmic ray propagation scenarios or is caused by in situ particle acceleration in the galaxy’s halo. Correspondingly, the halo is powered by the galaxy’s nuclear activity or by the accretion of intergalactic gas. If the formation of cosmic ray halos around galaxies is a common phenomenon, the interactions of cosmic ray protons and nuclei with the circumgalactic gas surrounding Milky Way could be responsible for the isotropic diffuse flux of neutrinos observed by Icecube.

Dates et versions

hal-03577090 , version 1 (16-02-2022)

Identifiants

Citer

Stefano Gabici, Sarah Recchia, Felix Aharonian, Viviana Niro. Giant cosmic ray halos around M31 and the Milky Way. 37th International Cosmic Ray Conference, Jul 2021, Berlin, Germany. pp.683, ⟨10.22323/1.395.0683⟩. ⟨hal-03577090⟩
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