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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28501
Title: Cosmic ray penetration in diffuse clouds
Authors: MORLINO, GIOVANNI 
S. Gabici
Issue Date: 2015
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. LETTERS 
Number: 451
Issue: 1
First Page: L100
Abstract: Cosmic rays are a fundamental source of ionization for molecular and diffuse clouds, influencing their chemical, thermal, and dynamical evolution. The amount of cosmic rays inside a cloud also determines the $\gamma$-ray flux produced by hadronic collisions between cosmic rays and cloud material. We study the spectrum of cosmic rays inside and outside of a diffuse cloud, by solving the stationary transport equation for cosmic rays including diffusion, advection and energy losses due to ionization of neutral hydrogen atoms. We found that the cosmic ray spectrum inside a diffuse cloud differs from the one in the interstellar medium for energies smaller than $E_{br}\approx 100$ MeV, irrespective of the model details. Below $E_{br}$, the spectrum is harder (softer) than that in the interstellar medium if the latter is a power law $\propto p^{-s}$ with $s$ larger (smaller) than $\sim 0.42$.
URI: http://hdl.handle.net/20.500.12386/28501
URL: http://arxiv.org/abs/1503.02435v2
https://academic.oup.com/mnrasl/article/451/1/L100/956285
ISSN: 1745-3925
DOI: 10.1093/mnrasl/slv074
Bibcode ADS: 2015MNRAS.451L.100M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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