Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..659b&link_type=abstract
Astrophysical Journal, Part 1, vol. 212, Mar. 15, 1977, p. 659-663.
Astronomy and Astrophysics
Astrophysics
22
Electron Distribution, High Energy Electrons, Hydrogen Clouds, Interstellar Matter, Bremsstrahlung, Compton Effect, Gamma Rays, Gas Ionization, Primary Cosmic Rays, Synchrotron Radiation
Scientific paper
The steady-state distribution of secondary electrons in dense interstellar clouds that are produced in collisions between primary cosmic rays and thermal gas atoms is calculated. It is found that if the magnetic field in such clouds is of the order of 100 microgauss, then the synchrotron volume emissivity in the clouds is sufficiently large that discrete isolated clouds may be identifiable in the Galactic radio background; if the field is as large as 1 milligauss, the synchrotron radiation from nearby clouds would be the dominant feature of radio maps of the Galaxy. Energetic secondary electrons in dark clouds will also manifest themselves through bremsstrahlung and inverse Compton contributions to the gamma-ray background and by increasing the hydrogen ionization rate in the clouds; calculations of the magnitude of these effects are given.
Brown Raymon L.
Marscher Alan P.
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