AAS 201st Meeting, January, 2003
Session 112. The ISM: Clouds and Regions
Poster, Thursday, January 9, 2003, 9:20am-4:00pm, Exhibit Hall AB

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[112.14] Molecular Depletion in MSX Infrared-Dark Clouds

S. J. Carey (SSC/Caltech), S.B. Charnley (NASA/Ames Research Center), M.P. Egan (Air Force Research Laboratory), P.A. Feldman, R.O. Redman (HIA/NRC-Canada)

We present the results of a study of molecular abundances in three infrared-dark clouds (IRDCs) identified in the Midcourse Space Experiment (MSX) Galactic plane survey. Isotopomers of CO, HCO+, CS, SO, N2H+, HCO2+, SO2, NH2D and HCN were observed using the NRAO/UASO 12m and JCMT telescopes. Molecular column densities are derived from the spectroscopic data. These column densities will be compared with the dust column densities independently derived from submillimeter emission and mid-infrared extinction. The depletion of molecular species as a function of grain volatility will be presented.

The author(s) of this abstract have provided an email address for comments about the abstract: carey@ipac.caltech.edu

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.