COS-B gamma-ray measurements, cosmic rays and the local interstellar medium

Details COS-B gamma-ray measurements, cosmic rays and the local interstellar medium COS-B gamma-ray measurements, cosmic rays and the local interstellar medium

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107..390l&link_type=abstract

Astronomy and Astrophysics, vol. 107, no. 2, Mar. 1982, p. 390-396.

Astronomy and Astrophysics

Astronomy

53

Cos-B Satellite, Cosmic Dust, Gamma Ray Astronomy, Gas Density, Hydrogen Clouds, Interstellar Gas, Abundance, Bremsstrahlung, Cosmic Rays, Electron Flux Density, Hydrogen Atoms, Interstellar Extinction

Scientific paper

A study of the relation between galaxy counts and gamma rays measured by the COS-B satellite clearly shows that there exists a bidimensional correlation between these quantities. Though the 21 cm measurements are more accurate than galaxy counts they show a weaker correlation with gamma rays. A significant fraction of the local gas in molecular form, linked to the dust, can account for this situation: gamma rays and galaxy counts being total gas tracers. The gamma-ray emissivity per hydrogen atom is derived leading to an estimate of the spectrum of the cosmic-ray electrons contributing to the gamma-ray emission through bremsstrahlung interactions.

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