Hot chemistry in the diffuse medium: spectral signature in the H2 rotational lines

Details Hot chemistry in the diffuse medium: spectral signature in the H2 rotational lines Hot chemistry in the diffuse medium: spectral signature in the H2 rotational lines

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..779v&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 779

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3

Turbulence, Chemistry, Shocks, Intermittency, H2 Rotational Lines

Scientific paper

Most of the diffuse interstellar medium is cold, but it must harbor pockets of hot gas to explain the large observed abundances of molecules like CH+ and HCO+. Because they dissipate locally large amounts of kinetic energy, MHD shocks and coherent vortices in turbulence can drive endothermic chemical reactions or reactions with large activation barriers. We predict the spectroscopic signatures in the H2 rotational lines of MHD shocks and vortices and compare them to those observed with the ISO-SWS along a line of sight through the Galaxy which samples 20 magnitudes of mostly diffuse gas.

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