Title: Detection of absorption by H2 in molecular clouds: A direct measurement of the H2:CO ratio
Abstract:view Abstract Citations (235) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Detection of Absorption by H 2 in Molecular Clouds: A Direct Measurement ...view Abstract Citations (235) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Detection of Absorption by H 2 in Molecular Clouds: A Direct Measurement of the H 2:CO Ratio Lacy, J. H. ; Knacke, R. ; Geballe, T. R. ; Tokunaga, A. T. 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. Publication: The Astrophysical Journal Pub Date: June 1994 DOI: 10.1086/187395 Bibcode: 1994ApJ...428L..69L Keywords: Abundance; Astronomical Models; Carbon Monoxide; Hydrogen; Infrared Absorption; Infrared Astronomy; Molecular Clouds; Arrays; Data Reduction; Infrared Detectors; Spectrographs; Astrophysics; ISM: ABUNDANCES; ISM: MOLECULES; INFRARED: ISM: LINES AND BANDS full text sources ADS | data products SIMBAD (14)Read More
Publication Year: 1994
Publication Date: 1994-06-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 233
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