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N2H(+) in the Orion ambient ridge - Cloud clumping versus rotationThe IRAM 30-m telescope is used to obtain spectra of the J = 1 yields 0 transition of N2H(+) over a 2 x 2 arcsec area toward the Orion-KL/IRc2 star-forming region with 26-arcsec angular resolution. The N2H(+) emission, which exclusively traces the ridge gas, exhibits multiple radial velocities which appear to arise from the presence of at least four clouds of quiescent material. It is argued that the velocity structure of N2H(+) does not uniformly change across OMC-1 and, consequently, is inconsistent with the presence of large-scale differential rotation of the extended ridge along the SW-NE axis about IRc2. The coincidence of the two larger clouds with star-forming activity in Orion-KL suggests that either the quiescent gas is being pushed apart or that the star formation may have been triggered by a cloud-cloud interaction.
Document ID
19930049491
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Womack, Maria
(Northern Arizona Univ. Flagstaff, AZ, United States)
Ziurys, L. M.
(Arizona State Univ. Tempe, United States)
Sage, L. J.
(Max-Planck-Inst. fuer Radioastronomie, Bonn, Germany; Nevada Univ. Las Vegas, United States)
Date Acquired
August 16, 2013
Publication Date
March 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 406
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A33488
Funding Number(s)
CONTRACT_GRANT: NAGW-3065
CONTRACT_GRANT: NSF AST-90-58467
CONTRACT_GRANT: NSF AST-91-10701
Distribution Limits
Public
Copyright
Other

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