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Title:
Detection of absorption by H2 in molecular clouds: A direct measurement of the H2:CO ratio
Authors:
Lacy, J. H.; Knacke, R.; Geballe, T. R.; Tokunaga, A. T.
Affiliation:
AA(University of Texas, Austin, TX, US), AB(University of Texas, Austin, TX, US), AC(Joint Astronomy Centre, Hilo, HI, US), AD(Joint Astronomy Centre, Hilo, HI, US)
Publication:
The Astrophysical Journal, vol. 428, no. 2, pt. 2, p. L69-L72 (ApJL Homepage)
Publication Date:
06/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Abundance, Astronomical Models, Carbon Monoxide, Hydrogen, Infrared Absorption, Infrared Astronomy, Molecular Clouds, Arrays, Data Reduction, Infrared Detectors, Spectrographs
DOI:
10.1086/187395
Bibliographic Code:
1994ApJ...428L..69L

Abstract

Vibrational absorption by H2 and CO has been searched for toward infrared sources embedded in molecular clouds. H2 was detected toward NGC 2024 IRS 2 and possibly toward NGC 2264 (GL 989). CO was detected toward both sources. The results are consistent with the H2 ortho:para ratio being equilibrated at the cloud temperature. Toward NGC 2024, H2:CO = (3700-2600+3100) (2 sigma limits), and toward NGC 2264, H2:CO less than 6000. Approximately one-third of all carbon is in gas-phase CO.

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