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http://hdl.handle.net/20.500.12386/34610
Titolo: | Rigorous Theory for Secondary Cosmic-Ray Ionization | Autori: | Ivlev, Alexei V. Silsbee, Kedron PADOVANI, Marco GALLI, Daniele |
Data pubblicazione: | 2021 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 909 | Fascicolo: | 2 | Da pagina:: | 107 | Abstract: | The energy spectrum of electrons produced in molecular gas by interstellar cosmic rays (CRs) is rigorously calculated as a function of gas column density N traversed by the CRs. This allows us to accurately compute the local value of the secondary ionization rate of molecular hydrogen, ${\zeta }_{\sec }(N)$ , as a function of the local primary ionization rate, ζ<SUB>p</SUB>(N). The ratio ${\zeta }_{\sec }/{\zeta }_{p}$ increases monotonically with N, and can considerably exceed the value of ≈0.67 commonly adopted in the literature. For sufficiently soft interstellar spectra, the dependence ${\zeta }_{\sec }/{\zeta }_{p}$ versus N is practically insensitive to their particular shape and thus is a general characteristic of the secondary CR ionization in dense gas. | URI: | http://hdl.handle.net/20.500.12386/34610 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/abdc27 https://api.elsevier.com/content/abstract/scopus_id/85103240284 |
ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/abdc27 | Bibcode ADS: | 2021ApJ...909..107I | Fulltext: | open |
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