Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980stin...8224159c&link_type=abstract
Presented at the 94th Symp. on Origin of Cosmic Rays, Bologna, 11-14 Jun. 1980
Astronomy and Astrophysics
Astronomy
Cosmic Rays, Galactic Radiation, Gamma Ray Astronomy, Stars, Stellar Winds, Acceleration (Physics), Cos-B Satellite, Kinetic Energy, Molecular Clouds, Stellar Luminosity, Wolf-Rayet Stars
Scientific paper
The question of whether OB associations are detectable high energy gamma ray sources because of the interaction of accelerated particles with the dense molecular cloud still present near young and massive stars was addressed. The three factors that govern the gamma ray visibility of a given OB association are (1) the rate of kinetic energy deposition; (2) the distance of the OB association; and (3) the angular extent of the association. The relative detectability of OB associations as well as of the Wolf-Rayet stars in them was examined. The expected gamma ray surface brightness for the 10 brightness associations, normalized to that of the Carina complex, are tabulated. The large scale correlation between galactic gamma radiation and Lyman continuum of photons is naturally explained as well as the dominance of the spiral structure on the galactic gamma ray emission.
Cass'e Michel
Montmerle Th.
Paul J. A.
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