To be published in Astrophysics and Space Science Proceedings.
astro-ph/1304.0416

For a PDF version of the article, click here.

NONTHERMAL EMISSION FROM STAR-FORMING GALAXIES

Yoel Rephaeli 1 and Massimo Persic 2


1 School of Physics and Astronomy, Tel Aviv University, Tel Aviv, 69978, Israel
and
Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla, CA 92093-0424, USA
2 INAF/Osservatorio Astronomico di Trieste and INFN-Trieste, via G.B.Tiepolo 11, I-34143 Trieste, Italy


Abstract: The detections of high-energy gamma-ray emission from the nearby starburst galaxies M 82 & NGC 253, and other local group galaxies, broaden our knowledge of star-driven nonthermal processes and phenomena in non-AGN star-forming galaxies. We review basic aspects of the related processes and their modeling in starburst galaxies. Since these processes involve both energetic electrons and protons accelerated by SN shocks, their respective radiative yields can be used to explore the SN-particle-radiation connection. Specifically, the relation between SN activity, energetic particles, and their radiative yields, is assessed through respective measures of the particle energy density in several star-forming galaxies. The deduced energy densities range from O(10-1) eV cm-3 in very quiet environments to O(102) eV cm-3 in regions with very high star-formation rates.


Table of Contents

INTRODUCTION

PARTICLE AND RADIATION SPETRA IN STARBURST GALAXIES

ESTIMATES OF COSMIC-RAY ENERGY DENSITY
Particles and magnetic field
Energetic particles and gamma-ray emission
Energetic particles and Supernovae

DISCUSSION

REFERENCES

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