High spectral resolution observations of fluorescent molecular hydrogen in molecular clouds

Details High spectral resolution observations of fluorescent molecular hydrogen in molecular clouds High spectral resolution observations of fluorescent molecular hydrogen in molecular clouds

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352..625b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, April 1, 1990, p. 625-629.

Astronomy and Astrophysics

Astrophysics

27

Emission Spectra, Hydrogen, Infrared Spectra, Molecular Clouds, Orion Nebula, Spectral Resolution, Fluorescence, High Resolution, Line Spectra, Ultraviolet Radiation

Scientific paper

The 1-0 S(1) line of molecular hydrogen has been observed at high spectral resolution in several sources where the emission was suspected of being fluorescent. In NGC 2023, the Orion Bar, and Parsamyan 18, the S(1) line is unresolved, and the line center close to the rest velocity of the ambient molecular cloud. Such behavior is expected for UV-excited line emission. The H2 line widths in molecular clouds thus can serve as diagnostic for shocked and UV-excitation mechanisms. If the lines are broader than several km/s or velocity shifts are observed across a source it is likely that shocks are responsible for the excitation of the gas.

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