Global cosmic-ray related luminosity and energy budget of the Milky Way

Details Global cosmic-ray related luminosity and energy budget of the Milky Way Global cosmic-ray related luminosity and energy budget of the Milky Way

2010-08-25

arxiv.org/abs/1008.4330v1

The Astrophysical Journal Letters 722 (2010) L58-L63

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

7 pages, 3 figures, 2 tables, accepted by ApJL

Scientific paper

10.1088/2041-8205/722/1/L58

We use the GALPROP code for cosmic-ray (CR) propagation to calculate the broad-band luminosity spectrum of the Milky Way related to CR propagation and interactions in the interstellar medium. This includes gamma-ray emission from the production and subsequent decay of neutral pions, bremsstrahlung, and inverse Compton scattering, and synchrotron radiation. The Galaxy is found to be nearly a CR electron calorimeter, but {\it only} if gamma ray emitting processes are taken into account. Synchrotron radiation alone accounts for only one third of the total electron energy losses with ~10-20% of the total synchrotron emission from secondary CR electrons and positrons. The relationship between far-infrared and radio luminosity that we find from our models is consistent with that found for galaxies in general. The results will be useful for understanding the connection between diffuse emissions from radio through gamma rays in ``normal'' (non-AGN dominated) galaxies, as well as for estimating the broad-band extragalactic diffuse background from these kinds of galaxies.

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