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The line-of-sight distribution of water in the SgrB2 complex

Comito, C. and Schilke, P. and Gerin, M. and Phillips, T. G. and Zmuidzinas, J. and Lis, D. C. (2003) The line-of-sight distribution of water in the SgrB2 complex. Astronomy and Astrophysics, 402 (2). pp. 635-645. ISSN 0004-6361. doi:10.1051/0004-6361:20030293.

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We report the detection, with the Caltech Submillimeter Observatory, of the 894-GHz HDO(1₁,₁-0₀,₀) transition, observed in absorption against the background continuum emission of the SgrB2 cores M and N. Radiative transfer modeling of this feature, together with the published data set of mm and submm HDO and H₂¹⁸ transitions, suggests that ground-state absorption features from deuterated and non-deuterated water trace different gas components along the line of sight. In particular, while the HDO line seems to be produced by the large column densities of gas located in the SgrB2 warm envelope, the H₂¹⁸ ground-state transition detected by SWAS and KAO at 548 GHz (Neufeld et al. [CITE]; Zmuidzinas et al. [CITE]) is instead a product of the hot, diffuse, thin gas layer lying in the foreground of the SgrB2 complex.

Item Type:Article
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URLURL TypeDescription Paper
Schilke, P.0000-0003-2141-5689
Lis, D. C.0000-0002-0500-4700
Additional Information:© 2003 ESO. Article published by EDP Sciences. Received 17 December 2002; Accepted 27 February 2003. Published online 14 April 2003. The CSO is operated by the California Institute of Technology under funding from the National Science Foundation, Grant No. AST-9980846. The authors are grateful to D. Neufeld for providing the 548-GHz SWAS data in digital format; to M. Walmsley, T. Wilson and C. Ceccarelli for their valuable comments; and to the referee, E. Bergin, whose input has very much contributed to improve the quality of this paper. CC acknowledges travel support and sunny hospitality from the Submillimeter Wave Astrophysics Research Group at Caltech.
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Subject Keywords:astrochemistry – ISM: individual objects: SgrB2 – ISM: abundances – ISM: molecules
Issue or Number:2
Record Number:CaltechAUTHORS:20200130-082336961
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Official Citation:The line-of-sight distribution of water in the SgrB2 complex. C. Comito, P. Schilke, M. Gerin, T. G. Phillips, J. Zmuidzinas and D. C. Lis. A&A, 402 2 (2003) 635-645 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101000
Deposited By: Tony Diaz
Deposited On:30 Jan 2020 19:10
Last Modified:16 Nov 2021 17:58

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