Cosmic ray production and emission in M82

Tova Yoast-Hull*, John Everett, J. S. Gallagher, Ellen Zweibel

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish (US)
Title of host publicationThe Spectral Energy Distribution of Galaxies
EditorsRichard J. Tuffs, Cristina C. Popescu
Number of pages3
StatePublished - Sep 2011

Publication series

NameProceedings of the International Astronomical Union
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221


  • cosmic rays
  • galaxies: individual (M82)
  • galaxies: starburst
  • gamma rays: theory
  • radio continuum: galaxies

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science


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