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Chlorine in dense interstellar clouds - The abundance of HCl in OMC-1
External Online Source: doi:10.1086/163394
Author and Affiliation:
Blake, G. A.(California Inst. of Tech., Pasadena, CA, United States);
Keene, J.(California Inst. of Tech., Pasadena, CA, United States);
Phillips, T. G.(California Institute of Technology, Pasadena, United States)
Abstract: The first detection of a chlorine-bearing molecular species in the interstellar medium via emission from the J = 1-0 transition of HCl at 625.9 GHz toward OMC-1 is reported. The relative strengths, widths, and velocities of the resolved hyperfine components are consistent with moderate optical depth emission originating from dense, quiescent molecular cloud material. The overall emission strength implies a fractional abundance of f(HCl/H2) of about (0.5-5.0) x 10 to the -8th, depending on the density of the emitting region. This is approximately an order of magnitude below previous theoretical estimates and a factor of 3-30 below the cosmic abundance of Cl. Recent laboratory work suggests that the lowered fractional abundance of HCl is caused by a combination of depletion onto grains with gas-phase loss processes such as the reaction of HCl with C(+).
Publication Date: Aug 15, 1985
Document ID:
19850064294
(Acquired Nov 28, 1995)
Accession Number: 85A46445
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1 (ISSN 0004-637X); 295; 501-506
Publisher Information: United States
Contract/Grant/Task Num: NAG2-1
Financial Sponsor: NASA; United States
Organization Source: California Inst. of Tech.; Pasadena, CA, United States
Description: 6p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ABUNDANCE; ASTRONOMICAL SPECTROSCOPY; CHLORINE; EMISSION SPECTRA; HYDROCHLORIC ACID; INTERSTELLAR CHEMISTRY; INTERSTELLAR GAS; MOLECULAR CLOUDS; OPTICAL THICKNESS
Imprint And Other Notes: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 295, Aug. 15, 1985, p. 501-506.
Availability Source: Other Sources
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