Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-02-07
Astrophys.J. 586 (2003) L33-L36
Astronomy and Astrophysics
Astrophysics
To appear in Astrophysical Journal Letters. One reference added
Scientific paper
10.1086/374654
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 km-scale neutrino telescopes, like ICECUBE, within reasonable integration times.
Romero Gustavo E.
Torres Diego F.
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