Space Science Reviews

, Volume 36, Issue 1, pp 41–49

The relevance of molecular observations to gamma-ray astronomy

  • T. W. Hartquist

DOI: 10.1007/BF00171899

Cite this article as:
Hartquist, T.W. Space Sci Rev (1983) 36: 41. doi:10.1007/BF00171899


The interaction of cosmic rays with interstellar clouds may produce some of the observed gamma-ray sources. The use of molecular observations to estimate the cloud masses, which are used to derive cosmic-ray fluxes, is reviewed. Molecular diagnostics of high cosmic-ray ionization rates are discussed, and a detailed application of those diagnostics is summarised and presented as evidence that second-order Fermi acceleration is important in old supernova remnants and can produce cosmic rays of too low energy to induce gamma-ray emission.

Copyright information

© D. Reidel Publishing Co 1983

Authors and Affiliations

  • T. W. Hartquist
    • 1
  1. 1.Department of Physics and AstronomyUniversity College LondonLondonEngland

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