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The molecular emission-line spectrum of IRC +10216 between 330 and 358 GHz

Groesbeck, T. D. and Phillips, T. G. and Blake, Geoffrey A. (1994) The molecular emission-line spectrum of IRC +10216 between 330 and 358 GHz. Astrophysical Journal Supplement Series, 94 (1). pp. 147-162. ISSN 0067-0049.

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We have conducted a spectral line survey of IRC + 10216 using the Caltech Submillimeter Observatory to an average sensitivity of ≾95 mK. A deconvolution algorithm has been used to derive the continuous single-sideband spectrum from 330.2 to 358.1 GHz. A total of 56 spectral lines were detected of which 54 have been identified with 8 molecules and a total of 18 isotopomers. The observed lines are used to derive column densities and relative abundances for the detected species. Within this frequency range the spectral lines detected contribute the majority of the total flux emitted by IRC + 10216. We use the derived column densities and excitation temperatures to simulate the molecular line emission (assuming LTE) at frequencies up to 1000 GHz. The observed and simulated flux from line emission is compared to broadband total flux measurements and to dust emission assuming a power-law variation of the dust emissivity. We conclude that significant corrections for the line flux must be made to broadband flux measurements of IRC + 10216 at wavelengths longer than ~750 µm.

Item Type:Article
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Blake, Geoffrey A.0000-0003-0787-1610
Additional Information:© 1994 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1993 September 14; accepted 1994 February 7. We wish to thank the CSO staff for their assistance with the observations. We are grateful to Göran Sandell for permission to use his unpublished data and to an anonymous referee for suggesting the identification of the vibrationally excited H13CN line. This work has been supported by NSF grant AST 90-15755 to the California Institute of Technology. G.A.B. would like to acknowledge support from the David and Lucille Packard and Alfred P. Sloan Foundations.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
NSFAST 90-15755
David and Lucile Packard FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:circumstellar matter; line: identification; radio lines: ISM stars: individual (IRC + 10216)
Issue or Number:1
Record Number:CaltechAUTHORS:20120912-143915602
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Official Citation:The molecular emission-line spectrum of IRC +10216 between 330 and 358 GHz Groesbeck, T. D.; Phillips, T. G.; Blake, Geoffrey A.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34037
Deposited By: Ruth Sustaita
Deposited On:13 Sep 2012 14:46
Last Modified:03 Oct 2019 04:15

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