Author:
Kalashev Oleg,Martynenko Nickolay,Troitsky Sergey
Abstract
Abstract
Cosmic rays escaping the Milky-Way disk interact with circumgalactic gas which fills the
virial volume of our Galaxy. These interactions should produce guaranteed fluxes of energetic
diffuse neutrinos and photons observable at the Earth. This neutrino flux would be a plausible
contribution to the spectrum measured by the IceCube neutrino observatory: the energy emitted in
this way is weakly constrained from cascade gamma rays, since the cascades have no time to
develop, but the arrival directions of the neutrinos do not point to the Galactic disk, in
agreement with observations. However, previous studies reported very different estimates of the
corresponding neutrino flux, so it was unclear if this contribution to the observed spectrum is
essential. Here we readdress the calculation of this diffuse neutrino flux component under various
assumptions about the cosmic-ray spectrum and propagation in the circumgalactic medium. We find
that even with these variations, this contribution to the observed neutrino flux remains
subleading provided multimessenger constraints are satisfied.
Subject
Astronomy and Astrophysics
Cited by
1 articles.
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