EDP Sciences
Free access
Volume 402, Number 2, May I 2003
Page(s) 635 - 645
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20030293

A&A 402, 635-645 (2003)
DOI: 10.1051/0004-6361:20030293

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

C. Comito1, P. Schilke1, M. Gerin2, T. G. Phillips3, J. Zmuidzinas3 and D. C. Lis3

1  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2  Laboratoire de Radioastronomie Millimétrique, Observatoire de Paris and École Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France
3  California Institute of Technology, Downs Laboratory of Physics 320-47, Pasadena, CA 91125, USA

(Received 17 December 2002 / Accepted 27 February 2003)

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 H 218 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 H 218 ground-state transition detected by SWAS and KAO at 548 GHz (Neufeld et al. 2000; Zmuidzinas et al. 1995a) is instead a product of the hot, diffuse, thin gas layer lying in the foreground of the SgrB2 complex.

Key words: astrochemistry -- ISM: individual objects: SgrB2 -- ISM: abundances -- ISM: molecules

Offprint request: C. Comito, ccomito@mpifr-bonn.mpg.de

SIMBAD Objects

© ESO 2003

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.

An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account.
    In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.