Is NGC 253 A Calorimeter?
Yoast-Hull, Tova ( University of Wisconsin-Madison ); Gallagher, J. S. ( University of Wisconsin-Madison ); Zweibel, E. G. ( University of Wisconsin-Madison ); Everett, J. E. ( Northwestern University ) show affiliations
American Astronomical Society, AAS Meeting #221, #157.05
Published in Jan 2013
Based on our semi-analytic model for M82 (Yoast-Hull et al. 2012), we have developed and applied a model for cosmic ray interactions in starburst galaxies as a means to test the calorimeter model. We aim to determine whether the model is generic and applicable to other starburst systems. NGC 253 and M82 are the only starburst galaxies detected at GeV and TeV energies. Assuming constant cosmic-ray acceleration efficiency with Milky Way parameters, we calculate the cosmic-ray proton and primary & secondary electron/positron populations. From the cosmic-ray spectra and observed parameters of the interstellar medium of the NGC 253 starburst nucleus and its wind, we predict the radio and gamma-ray spectra and compare with published measurements.
(c) 2013: American Astronomical Society