Physical conditions in an optically thin relativistic gas irradiated by gamma-rays

Details Physical conditions in an optically thin relativistic gas irradiated by gamma-rays Physical conditions in an optically thin relativistic gas irradiated by gamma-rays

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100..271k&link_type=abstract

Astronomy and Astrophysics, vol. 100, no. 2, July 1981, p. 271-276. Research supported by the United States-Israel Binational S

Astronomy and Astrophysics

Astronomy

Cosmic Gases, Gamma Ray Astronomy, Optical Thickness, Radiation Sources, Relativistic Plasmas, Annihilation Reactions, Approximation, Bremsstrahlung, Electron Density (Concentration), Hydrogen Plasma, Pair Production, Particle Density (Concentration), Plasma Density, Plasma Temperature, Plasma-Electromagnetic Interaction, Positrons, Radiant Cooling, Radiant Heating, X Rays

Scientific paper

The temperature Te and the positron density n+ in an optically thin relativistic gas cloud irradiated by γ-rays are calculated. A power-law spectrum with an energy power index β, and a low energy cutoff E0 is assumed. It is assumed that both E0 and kTe are much larger than mc2 (m is the electron mass). The behaviour of Te and n+, as functions of β, E0, and the γ-ray flux I, is rather regular. In particular the temperature Te approaches some constant depending on β and E0 when the γ-ray flux becomes large. The approximate expressions in the extreme cases of a large or small γ-ray fluxes or equivalently low and high nucleon densities respectively are given. The cooling effect of X-rays and softer radiation is discussed.

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