The Physics of the Calorimeter Model in M82

Type Conference Paper
Names Tova Yoast-Hull, J. Everett, J. S. Gallagher, E. Zweibel
Proceedings Title Bulletin of the American Astronomical Society
Conference Name American Astronomical Society, AAS Meeting #217, #245.04
Volume 43
Date January 1, 2011
Library Catalog NASA ADS
Abstract The striking correlation between far-infrared and radio emission found in disk galaxies has led to a calorimetric model for galaxies. In this calorimeter model, all the energy input from supernovae is expended within the galaxy, so both the far-infrared and radio synchrotron emission from cosmic rays are proportional to the supernova rate. To determine how broadly the calorimeter model applies, we examine the energy balance in the starburst galaxy M82: this galaxy's hyperactive star formation rate per unit area (100 times the Milky Way's mean value) provides a severe test of the calorimeter model. Using an empirical model for the M82 starburst zone, we determine confinement times of cosmic rays in the galaxy and the energy losses of primary and secondary cosmic rays, specifically accounting for pair production, ionization losses, and synchrotron emission. We also consider the role of a wind in the propagation and transport of the cosmic rays. The results are tested against the observed multi-wavelength characteristics of M82.
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