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Nitric oxide in star-forming regions - Further evidence for interstellar N-O bondsNitric oxide has been newly detected toward several star-forming clouds, including Orion-KL, Sgr B2(N), W33A, W51M, and DR21(OH) via its J = 3/2-1/2 transitions near 150 GHz, using the FCRAO 14 m telescope. Both lambda-doubling components of NO were observed toward all sources. Column densities derived for nitric oxide in these clouds are 10 to the 15th-10 to the 16th/sq cm, corresponding to fractional abundances of 0.5-1.0 x 10 to the -8th, relative to H2. Toward Orion-KL, the NO line profile suggests that the species arises primarily from hot, dense gas. Nitric oxide may arise from warm material toward the other clouds as well. Nitric oxide in star-forming regions could be synthesized by high-temperature reactions, although the observed abundances do not disagree with values predicted from low-temperature, ion-molecule chemistry by more than one order of magnitude.
Document ID
19910053996
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ziurys, L. M.
(Arizona State University Tempe; Steward Observatory, Tucson, United States)
Mcgonagle, D.
(Arizona State Univ. Tempe, AZ, United States)
Minh, Y.
(Arizona State Univ. Tempe, AZ, United States)
Irvine, W. M.
(Five College Radio Astronomy Observatory Amherst, MA, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 373
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A38619
Funding Number(s)
CONTRACT_GRANT: NAGW-436
CONTRACT_GRANT: NSF AST-88-15406
CONTRACT_GRANT: NSF AST-90-58467
Distribution Limits
Public
Copyright
Other

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