Cosmic ray transport in starburst galaxies and possible observables
Journal
Date Issued
2019
Author(s)
Abstract
The nuclei of starburst galaxies are unique sources of high-energy radiation where ideal condi-tions for cosmic ray acceleration and confinement might be achieved. We investigate the con-ditions for effective cosmic ray confinement by modelling the transport accounting for diffusionand advection, and we study the implications of such confinement in terms of multifrequencyemission and production of high-energy neutrinos. Both primary and secondary electrons, aswell as electron-positron pairs produced by gamma ray absorption inside these regions are takeninto account. Electrons and positrons produced as secondary products of hadronic interactionsare found to be responsible for most of the emission of leptonic origin. In particular, secondaryelectrons produce an extended synchrotron emission of hard X-rays that represent a remarkablesignature of hadronic processes, potentially accessible to current and future observations in theX-ray band. We also apply for the first time our detailed model to study the starburst contributionto the diffuse gamma-ray and neutrino fluxes observed by Fermi-LAT and IceCube. In order toassess such contribution we adopt a redshift number density of starburst-like objects based on theinfrared luminosity function inferred by Herschel observations and we take into account the effectof the electromagnetic cascade in the intergalactic medium.
Coverage
36th International Cosmic Ray Conference (ICRC2019)
Volume
358
Start page
382
Conferenece
36th International Cosmic Ray Conference (ICRC2019)
Conferenece place
Madison, WI, U.S.A.
Conferenece date
July 24th-August 1st, 2019
Issn Identifier
1824-8039
Ads BibCode
2019ICRC...36..382P
Rights
open.access
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