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Cosmic ray production and emission in M82

Published online by Cambridge University Press:  17 August 2012

Tova Yoast-Hull ,
John Everett ,
J. S. Gallagher III  and
Ellen Zweibel
Tova Yoast-Hull
Affiliation:
Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA email: yoasthull@wisc.edu
John Everett
Affiliation:
Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA email: yoasthull@wisc.edu Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706, USA
J. S. Gallagher III
Affiliation:
Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706, USA
Ellen Zweibel
Affiliation:
Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA email: yoasthull@wisc.edu Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706, USA
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Abstract

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Starting from first principles, we construct a simple model for the evolution of energetic particles produced by supernovae in the starburst galaxy M82. The supernova rate, geometry, and properties of the interstellar medium are all well observed in this nearby galaxy. Assuming a uniform interstellar medium and constant cosmic-ray injection rate, we estimate the cosmic-ray proton and primary & secondary electron/positron populations. From these particle spectra, we predict the gamma ray flux and the radio synchrotron spectrum. The model is then compared to the observed radio and gamma-ray spectra of M82 as well as previous models by Torres (2004), Persic et al. (2008), and de Cea del Pozo et al. (2009). Through this project, we aim to build a better understanding of the calorimeter model, in which energetic particle fluxes reflect supernova rates, and a better understanding of the radio-FIR correlation in galaxies.

Keywords

galaxies: individual (M82)galaxies: starburstcosmic raysgamma rays: theoryradio continuum: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 397 - 399
Copyright
Copyright © International Astronomical Union 2012

References

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