Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332..400s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 1, 1988, p. 400-409.
Astronomy and Astrophysics
Astronomy
91
Infrared Astronomy, Interstellar Gas, Molecular Gases, Scaling Laws, Ultraviolet Absorption, Incident Radiation, Luminous Intensity, Molecular Clouds
Scientific paper
A scaling law for molecular hydrogen clouds is presented. The law relates the dependence of the intensities of the infrared fluorescent emission line produced in low-density, cold, isothermal, static photodissociation regions of such clouds on the gas density, the intensity of the incident UV radiation, the molecular formation rate coefficient, and the effective grain continuum UV absorption cross-section to a single calculated reference spectrum and a UV-to-IR conversion efficiency function. The computed reference spectrum and conversion efficiency function are presented for a gas cloud at a temperature of 1000 K, and observations of fluorescent emission in the two reflection nebulae Parsamyan 18 and NGC 2023 are analyzed.
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