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Gamma-rays from atomic and molecular gas in the first galactic quadrant

Caraveo, P. A.; Bignami, G. F.; Strong, A. W. +15 more

The fully sampled Columbia 1 deg CO survey and the Berkeley H I survey are compared with the COS B gamma-ray survey. As a first step, the study is limited to the high-energy gamma-rays (E greater than 300 MeV). It is found that a simple model, in which uniformly distributed cosmic rays interact with the interstellar gas, as traced by H I and CO, c…

Gamma-ray observations toward NGC 1275 and the origin of the emissionin the infrared, X-rays, and gamma-rays.

Bignami, G. F.; Strong, A. W.

The COS B gamma-ray data used in the present search for possible emission mechanisms in the halo and nucleus of NGC 1275 show a gamma-ray excess at the galaxy's position which, if interpreted as emission from the galaxy, yields consequences concerning the origin of the hard X-rays and the IR-optical emission from the nucleus. These data are studie…

The galactic gamma-ray source population

Godfrey, C. P.

A procedure has been developed to estimate the contribution to the galactic gamma-ray emission by discrete sources under the assumption that the sources are distributed spatially like the total emission, but without regard to the nature of the individual sources. In particular, an analytical method is developed for calculating the fraction of the …