Extended gamma-ray sources and active regions in the Galaxy - The Carina and Orion complexes

Details Extended gamma-ray sources and active regions in the Galaxy - The Carina and Orion complexes Extended gamma-ray sources and active regions in the Galaxy - The Carina and Orion complexes

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.301..505m&link_type=abstract

(Royal Society, Discussion on Gamma-Ray Astronomy, London, England, Nov. 27, 28, 1980.) Royal Society (London), Philosophical Tr

Astronomy and Astrophysics

Astronomy

15

Gamma Ray Astronomy, Milky Way Galaxy, Nebulae, Radiation Sources, Cos-B Satellite, H Ii Regions, Magnetohydrodynamic Waves, Orion Nebula, Particle Acceleration, Protons, Stellar Winds, Wave Scattering

Scientific paper

It is found that at least one class of gamma-ray sources is linked with extremely young objects in the Galaxy, namely regions of star formation (active regions). This class includes the Orion complex, the Rho-Oph cloud, and supernova remnants physically linked with OB-associations (SNOBs). The considered investigation is concerned with the evidence for the inclusion of the Carina complex. The possibility that gamma-ray sources in active regions are extended is studied. The Carina complex appears a good candidate for identification with the gamma-ray source 2CG288-00. By comparing the Carina complex with the Orion complex conclusions are drawn as to the conditions required for an active region to appear as a gamma-source. It is found that to have a gamma-ray source, it is necessary to assume some reasonably efficient confinement mechanism for cosmic rays, unless the mechanical power is many orders of magnitude higher than the gamma-ray luminosity. According to the considered model, the dominant gamma-ray emission must come from the H II region NGC 3372 itself.

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