view Abstract Citations (71) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Ultraviolet Fluorescent Molecular Hydrogen Emission Sternberg, Amiel Abstract 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. Publication: The Astrophysical Journal Pub Date: December 1989 DOI: 10.1086/168177 Bibcode: 1989ApJ...347..863S Keywords: Emission Spectra; Fluorescence; Hydrogen; Reflection Nebulae; Ultraviolet Spectra; Emissivity; Infrared Radiation; Molecular Excitation; Photodissociation; Astrophysics; INTERSTELLAR: MOLECULES; MOLECULAR PROCESSES; NEBULAE: REFLECTION; ULTRAVIOLET: SPECTRA full text sources ADS | data products SIMBAD (3) MAST (1)