The interstellar spectrum of cosmic rays

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Rays, Energy Spectra, Gamma Rays, Interstellar Radiation, Radiation Spectra, Galactic Nuclei, Particle Collisions, Pions, Proton Energy, Proton Flux Density

Scientific paper

Recent measurements of the angular distribution of cosmic gamma rays have been used to obtain information about the spectrum of cosmic-ray protons and heavier nuclei in interstellar space. Attention is devoted particularly towards gamma rays from directions well away from the galactic center, where the predominant production mechanism for quanta above 100 MeV appears to be by way of neutral pions generated in cosmic ray-interstellar gas nucleus collisions. The distribution of cosmic rays both in and away from the galactic plane is a crucial problem in the analysis, and it is examined in some detail. It is concluded that the spectral form for the interstellar spectrum (within about 2 kpc) suggested by Comstock, Hsieh, and Simpson (1972) gives a good fit to the data. The intensity of protons at 3 GeV is less than or approximately equal to 0.27 per sq m/s/sr/MeV.

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