The Nine Lives of Cosmic Rays in Galaxies

Cosmic-ray astrophysics has advanced rapidly in recent years, and its impact on other astronomical disciplines has broadened. Many new experiments measuring these particles, both directly in the atmosphere or space and indirectly via γ rays and synchrotron radiation, have widened the range and quali...

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Bibliographic Details
Published in:Annual review of astronomy and astrophysics 2015-01, Vol.53 (1), p.199-246
Main Authors: Grenier, Isabelle A, Black, John H, Strong, Andrew W
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Clouds
Cosmic rays
Cosmology
Dust
Experiments
Galaxies
Interstellar chemistry
Interstellar matter
Interstellar medium
Propagation
rays
Stars & galaxies
Superbubbles
Synchrotron radiation
γ rays
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Summary:Cosmic-ray astrophysics has advanced rapidly in recent years, and its impact on other astronomical disciplines has broadened. Many new experiments measuring these particles, both directly in the atmosphere or space and indirectly via γ rays and synchrotron radiation, have widened the range and quality of the information available on their origin, propagation, and interactions. The impact of low-energy cosmic rays on interstellar chemistry is a fast-developing topic, including the propagation of these particles into the clouds in which the chemistry occurs. Cosmic rays, via their γ -ray production, also provide a powerful way to probe the gas content of the interstellar medium. Substantial advances have been made in the observations and modelling of the interplay between cosmic rays and the interstellar medium. Focusing on energies up to 1 TeV, these interrelating aspects are covered at various levels of detail, giving a guide to the state of the subject.
ISSN:0066-4146
1545-4282
1545-4282
DOI:10.1146/annurev-astro-082214-122457