Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231...95m&link_type=abstract
Astrophysical Journal, Part 1, vol. 231, July 1, 1979, p. 95-110.
Astronomy and Astrophysics
Astronomy
125
Cosmic Rays, Gamma Ray Astronomy, O Stars, Supernova Remnants, B Stars, H Ii Regions, High Energy Interactions, Milky Way Galaxy, Spatial Distribution, Stellar Evolution
Scientific paper
Spatial coincidences between supernova remnants and OB associations or H II regions are sought, and a list of about 30 objects (referred to as 'SNOBs') is obtained. On the basis of COS B data it is found that five, or perhaps six, of 11 as-yet unidentified gamma-ray sources are associated with SNOBs and that as many as three-fourths of the best-identified SNOBs may be observable in gamma rays. It is suggested that if a substantial proportion of the observed gamma rays originates from neutral-pion decay, SNOBs would appear to be a major source of galactic cosmic rays. A phenomenological scenario is considered in which cosmic rays are produced by a two-step process whereby low-energy particles are injected by the young member stars of an OB association and are subsequently accelerated by the shock wave from a nearby supernova explosion.
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