Local and large scale galactic gamma-ray emission

Details Local and large scale galactic gamma-ray emission Local and large scale galactic gamma-ray emission

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....50..247p&link_type=abstract

Astronomy and Astrophysics, vol. 50, no. 2, July 1976, p. 247-255.

Astronomy and Astrophysics

Astrophysics

31

Cosmic X Rays, Galactic Radiation, Gamma Rays, Carbon Monoxide, Cosmic Dust, H Ii Regions, Interstellar Gas, Milky Way Galaxy

Scientific paper

A study of the gas-to-dust ratio suggests that interstellar reddening may provide an accurate way of assessing column densities in various directions in the Galaxy. A gamma ray intensity of 7.25 x 10 to the -5th EB-V photon/sq cm/s/sterad is predicted for regions of the Galaxy where the medium cosmic ray density is equal to that observed close to the sun. It is found that in the longitude range of about 0-180 degrees, the large scale cosmic ray distribution producing the gamma rays follows that of extreme population I stars put in evidence by giant H II regions, and that of molecular hydrogen traced by carbon monoxide emission. The gamma-ray production exhibits a maximum at R roughly equal to 5 kpc, and practically vanishes at R not less than 11 kpc, beyond the location of the outermost H II regions.

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