H2ools - Molecular Hydrogen Optical Depth Templates

Details H2ools - Molecular Hydrogen Optical Depth Templates H2ools - Molecular Hydrogen Optical Depth Templates

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20111218m&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #112.18; Bulletin of the American Astronomical Society, Vol. 34, p.1282

Astronomy and Astrophysics

Astronomy

Scientific paper

The calculation of molecular hydrogen optical depth templates is described. These templates may be used to quickly identify and model molecular hydrogen absorption features in far-UV spectra, such as those obtained by the Far Ultraviolet Spectroscopic Explorer. The templates may be downloaded freely from the URL ěrb+ http://www.pha.jhu.edu/ stephan/h2ools2.html+. Individual templates are calculated containing all the Lyman and Werner transitions originating from a single rotational state (J") of the 0th vibrational level (v") of the ground electronic state. Templates are provided with 0.01 Å sampling for doppler parameters ranging from 2 <= b <= 20 km s-1 and rotational states 0 <= J" <= 15. Each is calculated for a fiducial column density of log[N(cm-2)] = 21 and may be scaled to any column less than this value without loss of accuracy. The transmission function is calculated by taking the template as the base-e exponent. These templates will facilitate the determination of the distribution of molecular hydrogen column density as a function of rotational level. Observationally these distributions are found to deviate from thermal equilibrium due to diverse processes such as, far-UV fluorescence, shock excitation, and formation pumping. This work has been supported by NASA grants NAG5-5315, NAG5-10403, and NAG5-11456 to the Johns Hopkins University.

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