Particle acceleration and multimessenger emission from starburst-driven galactic winds
Date Issued
2022
Author(s)
Abstract
The enhanced star forming activity, typical of starburst galaxies, powers
strong galactic winds expanding on kiloparsec (kpc) scales and characterized by
bubble structures. Here we discuss the possibility that particle acceleration
may take place at the termination shock of such winds. We calculate the
spectrum of accelerated particles and their maximum energy, that turns out to
range up to a few hundred petaelectronvolt (PeV) for typical values of the
parameters. Cosmic rays accelerated at the termination shock are advected
towards the edge of the bubble excavated by the wind and eventually escape into
extragalactic space. We also calculate the flux of gamma rays and neutrinos
produced by hadronic interactions in the bubble as well as the diffuse flux
resulting from the superposition of the contribution of starburst galaxies on
cosmological scales. Finally, we compute the diffuse flux of cosmic rays from
starburst bubbles and compare it with existing data.
Volume
511
Issue
1
Start page
1336
Issn Identifier
0035-8711
Rights
open.access
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