Journal
ASTROPHYSICAL JOURNAL
Volume 586, Issue 1, Pages L33-L36Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/374654
Keywords
galaxies : individual (NGC 253); galaxies : starburst; gamma rays : observations; gamma rays : theory
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We show that it appears possible for starburst galaxies, like the nearby NGC 253, recently identified as a TeV source by the CANGAROO collaboration, to emit a significant amount of high-energy gamma-rays and neutrinos through hadronic processes in their cores. We suggest that proton illumination of the inner winds of massive stars can be a viable mechanism for producing TeV gamma-rays and neutrinos without a strong MeV-GeV counterpart. The rich stellar content of the starbursts, with millions of early-type stars concentrated in the central regions, where collective effects of the stellar winds and supernovae can produce a significant enhancement of the cosmic-ray density, provides an adequate scenario for TeV gamma-ray generation. Close starbursts are also found to be potential sources for kilometer-scale neutrino telescopes, like IceCube, within reasonable integration times.
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