Statistics – Computation
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..863s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 863-874.
Statistics
Computation
49
Emission Spectra, Fluorescence, Hydrogen, Reflection Nebulae, Ultraviolet Spectra, Emissivity, Infrared Radiation, Molecular Excitation, Photodissociation
Scientific paper
Computations are presented of the ultraviolet (UV) molecular hydrogen fluorescent emission-line spectra that are produced in cold, isothermal, low-density, static photodissociation regions. An approximte scaling equation is provided which relates the UV line intensities to the gas density, the intensity of the incident UV continuum radiation, the molecular formation rate coefficient, and the effective grain UV continuum absorption cross section. The UV emission-line intensities for a wide range of cloud conditions may be estimated using the scaling equation, an UV continuum-to-line conversion efficiency function, and a single computed reference spectrum. The relationship between ultraviolet and infrared fluorescent emissivities is discussed. The observations of UV fluorescent emission from the reflection nebula IC 63 are analyzed, and the intensity of detectable infrared fluorescent emission from this object is predicted. The intensities of UV fluorescent emission from the reflection nebulae Parsamyan 18 and NGC 2023 are also predicted.
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