Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.2901r&link_type=abstract
American Astronomical Society, HEAD meeting #11, #29.01; Bulletin of the American Astronomical Society, Vol. 41, p.700
Astronomy and Astrophysics
Astronomy
Scientific paper
We have made detailed predictions of high-energy γ-ray emission from the nearby starburst (SB) galaxies M82 and NGC253. Our treatment is based on a convection-diffusion model for energetic electron and proton propagation from their SN acceleration sites in the galactic central region. Accounting for all the relevant hadronic and leptonic processes, we determine the particle steady-state energy distributions by normalizing to the measured radio emission from both the SB and full disk regions. Doing so fully specifies the electron spectrum throughout the galactic disk, and with an assumed spatial profile of the mean strength of the magnetic field, the predicted radio emission from the full disk matches well the measured spectrum. Our quantitative predictions for the electron and proton radiative yields have recently been confirmed by measurements of both galaxies and Fermi/LAT and Cherenkov telescopes VERITAS and H.E.S.S. I will briefly describe our approach and predicted high energy spectra, and will then discuss the significance of the results to our understanding of the nonthermal quantities and process in SB galaxies.
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