Cosmic ray ionization of the interstellar medium

Details Cosmic ray ionization of the interstellar medium Cosmic ray ionization of the interstellar medium

1993-11-18

arxiv.org/abs/astro-ph/9311048v1

Mon.Not.Roy.Astron.Soc. 267 (1994) 447

Astronomy and Astrophysics

Astrophysics

(to appear in MNRAS) 8 pages, Plain TeX, 2 figures available upon request, Max Planck Institut f. Radioastronomie preprint # 5

Scientific paper

We consider a cosmic ray spectrum that is a power law in momentum down to a cutoff and derive a lower cutoff corresponding to $E_{kin} \sim (30-60)$ 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 at such energies and that, at first approximation, a power law spectra with a lower cutoff 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.

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