Cosmic-Ray Induced Diffuse Emissions from the Milky Way and Local Group Galaxies

Details Cosmic-Ray Induced Diffuse Emissions from the Milky Way and Local Group Galaxies Cosmic-Ray Induced Diffuse Emissions from the Milky Way and Local Group Galaxies

2011-12-07

arxiv.org/abs/1112.1476v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Contribution to "The Spectral Energy Distribution of Galaxies" Proceedings IAU Symposium No. 284, 2011, eds. R.J. Tuffs & C.C.

Scientific paper

Cosmic rays fill up the entire volume of galaxies, providing an important source of heating and ionisation of the interstellar medium, and may play a significant role in the regulation of star formation and galactic evolution. Diffuse emissions from radio to high-energy gamma rays (> 100 MeV) arising from various interactions between cosmic rays and the interstellar medium, interstellar radiation field, and magnetic field, are currently the best way to trace the intensities and spectra of cosmic rays in the Milky Way and other galaxies. In this contribution, I describe our recent work to model the full spectral energy distribution of galaxies like the Milky Way from radio to gamma-ray energies. The application to other galaxies, in particular the Magellanic Clouds and M31 that are detected in high-energy gamma-rays by the Fermi-LAT, is also discussed.

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