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Molecular Astrophysics pp 281–293Cite as

The Chemistry of Shocked Regions of the Interstellar Gas

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Part of the book series: NATO ASI Series ((ASIC,volume 157))

Abstract

Shock waves occur in compressible fluids when the pressure gradients are large enough to generate supersonic motion. Because information about the pressure disturbances cannot propagate upstream faster than the velocity of sound the fluid ahead of the shock does not respond dynamically until the shock arrives. The shock then compresses and heats the fluid. The boundary which separates the hot compressed fluid and the upstream fluid is called the shock front. The shocked material will undergo excitation, dissociation and ionization if the shock is rapid. The subsequent recombinations and emissions produce photons which may dissociate and ionize the fluid constituents ahead of and behind the shock. This precursor radiation modifies the effect of the shock and influences its dynamical and thermal evolution. The shock structure is changed in the presence of a magnetic field and if the fractional ionization is small the shock may be preceeded by a magnetic precursor, compressing and heating the material ahead and behind the shock front (1,2,3).

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Author information

Authors and Affiliations

  1. Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, USA

    A. Dalgarno

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  1. A. Dalgarno
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Editors and Affiliations

  1. Institut für Astrophysik, Max-Planck-lnstitut für Physik und Astrophysik, Garching-bei-München, Germany

    G. H. F. Diercksen

  2. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico, USA

    W. F. Huebner

  3. Department of Chemistry, Indian University, Bloomington, Indiana, USA

    P. W. Langhoff

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© 1985 D. Reidel Publishing Company

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Dalgarno, A. (1985). The Chemistry of Shocked Regions of the Interstellar Gas. In: Diercksen, G.H.F., Huebner, W.F., Langhoff, P.W. (eds) Molecular Astrophysics. NATO ASI Series, vol 157. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5432-8_9

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  • DOI: https://doi.org/10.1007/978-94-009-5432-8_9

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  • Online ISBN: 978-94-009-5432-8

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