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Molecular line survey of Orion A from 215 to 247 GHz

Sutton, E. C. and Blake, Geoffrey A. and Masson, C. R. and Phillips, T. G. (1985) Molecular line survey of Orion A from 215 to 247 GHz. Astrophysical Journal Supplement Series, 58 (3). pp. 341-378. ISSN 0067-0049. http://resolver.caltech.edu/CaltechAUTHORS:20120919-152843984

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Abstract

Molecular line emission from the core of the Orion molecular cloud has been surveyed from 215 to 247 GHz to an average sensitivity of about 0.2 K. A total of 544 resolvable lines were detected, of which 517 are identified and attributed to 25 distinct chemical species. A large fraction of the lines are partially blended with other identified transitions. Because of the large line width in the Orion core, the spectrum is near the confusion limit for the weakest lines identified (≈ 0.2 K). The most abundant complex molecules present are HCOOCH_3, CH_30CH_3, and C_2H_5CN, with beam-averaged column densities of about 3X10^(15) cm^(-2). Together with the simpler species S0_2, CH_30H, and CH_3CN, they account for approximately 70% of the lines in the spectrum. Relatively few unidentified lines are present. There are 27 lines clearly present in the spectrum which are currently unidentified. However, many of these are thought to be high-lying transitions of complex asymmetric rotors such as CH_30H. Present spectroscopic data are inadequate to predict the frequencies of such transitions with sufficient accuracy.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/191045DOIUNSPECIFIED
http://adsabs.harvard.edu/abs/1985ApJS...58..341SPublisherUNSPECIFIED
Additional Information:© 1985 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1984 September 13; accepted 1984 December 17. The authors are grateful to F. J. Lovas, H. M. Pickett, F. C. De Lucia, E. Herbst, and G. M. Plummer for providing most of the spectroscopic data used in this work. In addition, the authors would like to thank D.P. Woody and S. L. Scott for their efforts in ensuring successful observations, and R. E. Miller of AT&T Bell Laboratories, Murray Hill, for supplying the junctions used in this work. Single-dish millimeter-wave astronomy at the Owens Valley Radio Observatory is supported by NSF grant AST-8214693.
Funders:
Funding AgencyGrant Number
NSFAST-8214693
Subject Keywords:interstellar: molecules; line identifications; radio sources: lines
Record Number:CaltechAUTHORS:20120919-152843984
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120919-152843984
Official Citation:Molecular line survey of Orion A from 215 to 247 GHz Sutton, E. C., Blake, G. A., Masson, C. R., & Phillips, T. G. Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 58, July 1985, p. 341-378.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34236
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Sep 2012 23:56
Last Modified:26 Dec 2012 16:13

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