Molecular Hydrogen

Details Molecular Hydrogen Molecular Hydrogen

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ssrv..119...71h&link_type=abstract

Space Science Reviews, Volume 119, Issue 1-4, pp. 71-91

Astronomy and Astrophysics

Astrophysics

12

Molecular Hydrogen, Infrared: Spectroscopy, Molecular Processes, Ism: Molecules, Ism: Clouds, Star Formation, Circumstellar Matter, Infrared: Galaxies

Scientific paper

Observations of H2 line emission in galactic and extragalactic environments obtained with the Infrared Space Observatory (ISO) are reviewed. The diagnostic capability of H2 observations is illustrated. We discuss what one has learned about such diverse astrophysical sources as photon-dominated regions, shocks, young stellar objects, planetary nebulae and starburst galaxies from ISO observations of H2 emission. In this context, we emphasise use of measured H2 line intensities to infer important physical quantities such as the gas temperature, gas density and radiation field and we discuss the different possible excitation mechanisms of H2. We also briefly consider future prospects for observation of H2 from space and from the ground.

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