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• W3100876959 abstract "We construct a family of models for the evolution of energetic particles in the starburst galaxy M82 and compare them to observations to test the calorimeter assumption that all cosmic ray energy is radiated in the starburst region. Assuming constant cosmic ray acceleration efficiency with Milky Way parameters, we calculate the cosmic-ray proton and primary and secondary electron/positron populations as a function of energy. Cosmic rays are injected with Galactic energy distributions and electron-to-proton ratio via Type II supernovae at the observed rate of 0.07 yr−1. From the cosmic ray spectra, we predict the radio synchrotron and γ-ray spectra. To more accurately model the radio spectrum, we incorporate a multiphase interstellar medium in the starburst region of M82. Our model interstellar medium is highly fragmented with compact dense molecular clouds and dense photoionized gas, both embedded in a hot, low density medium in overall pressure equilibrium. The spectra predicted by this one-zone model are compared to the observed radio and γ-ray spectra of M82. χ2 tests are used with radio and γ-ray observations and a range of model predictions to find the best-fit parameters. The best-fit model yields constraints on key parameters in the starburst zone of M82, including a magnetic field strength of ∼250 μG and a wind advection speed in the range of 300–700 km s−1. We find that M82 is a good electron calorimeter but not an ideal cosmic-ray proton calorimeter and discuss the implications of our results for the astrophysics of the far-infrared–radio correlation in starburst galaxies." @default.
• W3100876959 created "2020-11-23" @default.
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• W3100876959 date "2013-04-15" @default.
• W3100876959 modified "2023-10-12" @default.
• W3100876959 title "WINDS, CLUMPS, AND INTERACTING COSMIC RAYS IN M82" @default.
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• W3100876959 doi "https://doi.org/10.1088/0004-637x/768/1/53" @default.
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