Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...354..220m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 354, May 1, 1990, p. 220-228.
Astronomy and Astrophysics
Astrophysics
38
Diffuse Radiation, Fluorescence, Hydrogen, Interstellar Matter, Molecular Clouds, Astronomical Models, Carbon Monoxide, Emission Spectra, Lyman Spectra, Radiation Distribution, Ultraviolet Radiation
Scientific paper
The first detection of molecular hydrogen fluorescence in the diffuse interstellar medium is reported. Using the Berkeley UVX Shuttle Spectrometer, H2 Lyman band fluorescence has been observed in four directions, each with high significance. Molecular hydrogen fluorescence is detected in all directions that have previously been found to contain significant CO emission. A simple equilibrium model has been developed that includes attenuation of the incident UV radiation field by H2 line and dust continuum absorption. Evidence is found that the gas in the CO emission portions of the clouds may be clumpy, with a filling factor less than 0.2 and an average density greater than 30/cu cm in most cases.
Bowyer Stuart
Hurwitz Mark
Martin Christopher
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