EDP Sciences
Free access
Volume 406, Number 2, August I 2003
Page(s) L47 - L50
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20030932

A&A 406, L47-L50 (2003)
DOI: 10.1051/0004-6361:20030932


Far-infrared detection of $^{\mathsf{17}}$OH towards Sagittarius B2

E. T. Polehampton1, J. M. Brown2, B. M. Swinyard3 and J.-P. Baluteau4

1  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
    e-mail: epoleham@mpifr-bonn.mpg.de
2  Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, UK
    e-mail: john.m.brown@chem.ox.ac.uk
3  Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
    e-mail: B.M.Swinyard@rl.ac.uk
4  Laboratoire d'Astrophysique de Marseille, CNRS & Université de Provence, BP 8, 13376 Marseille Cedex 12, France
    e-mail: Jean-Paul.Baluteau@oamp.fr

(Received 31 January 2003 / Accepted 19 June 2003)

The frequencies and line strengths of the $^{2}\Pi_{3/2}~J=5$/2-3/2 rotational transition of  17OH have been calculated from an analysis of its far-infrared laser magnetic resonance spectrum. These results have been used to make the first detection of a pure rotational transition of  17OH in the ISM. Two resolved components of this transition appear in absorption towards the giant molecular cloud Sagittarius B2, which was observed at a spectral resolution of 33 km s -1 with the Fabry-Pérot mode of the ISO Long Wavelength Spectrometer. The corresponding transition of  18OH was also observed and its line shape was modelled using $\ion{H}{i}$ measurements. The 18O/ 17O ratio of 3.5 was then used to compare this with the observed 17OH line shape.

Key words: infrared: ISM -- molecular data -- ISM: molecules -- line: identification -- ISM: individual objects: Sagittarius B2

Offprint request: E. Polehampton, epoleham@mpifr-bonn.mpg.de

SIMBAD Objects
Tables at the CDS

© 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.