Physics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987izssr..51.1796b&link_type=abstract
Akademiia Nauk SSSR, Izvestiia, Seriia Fizicheskaia (ISSN 0367-6765), vol. 51, Oct. 1987, p. 1796-1798. In Russian.
Physics
Cosmic Rays, Interstellar Matter, Molecular Clouds, Supernovae, High Temperature Gases, Particle Acceleration, Shock Fronts
Scientific paper
The paper examines the effect of cosmic rays accelerated at shock fronts from supernova explosions on the formation of the shells of diffuse clouds in the interstellar medium (ISM). An analysis of observational data indicates the presence in the ISM of extended regions filled with hot coronal gas coexisting with dense neutral formations and 'warm' ionized gas. The main observational features are described well by the three-phase ISM model of McKee and Ostriker (1977); the quasi-steady state of the ISM in the framework of this model is sustained by shock waves from supernova explosions. It is shown that the rate of ionization of hydrogen atoms by shock-accelerated protons is several orders of magnitude greater than the rate of ionization by the average cosmic-ray background.
Bykov Andrei M.
Toptygin Igor N.
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