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Title: Cosmic ray ionization of the interstellar medium
Authors: Nath, Biman B.
Biermann, P.L.
Keywords: atmospheric ionization
cosmic rays
interstellar matter
molecular clouds
plasma heating
radiation spectra
particle diffusion
spectrum analysis
Issue Date: Mar-1994
Publisher: Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 1994, Vol.267, p447
Abstract: We consider a cosmic ray spectrum that is a power law in momentum down to a cut-off, and derive a lower cut-off corresponding to Ekin approximately (30-60) MeV from the observed ionization rates in nearby diffuse clouds. While the real spectra of cosmic rays may not be so simple, we argue that one expects a substantial change in the spectra of such energies and that, at a first approximation, a power-law spectrum with a lower cut-off is appropriate. Such a description of the cosmic rays in the interstellar medium is not only theoretically more attractive than the spectra used in the literature, but is also supported by recent observations.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 0035-8711
1365-2966 (Online)
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Copyright: 1994 Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

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