Volume 406, Number 2, August I 2003
|Page(s)||L47 - L50|
|Published online||17 November 2003|
Letter to the Editor
Far-infrared detection of OH towards Sagittarius B2 *
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: email@example.com
2 Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, UK e-mail: firstname.lastname@example.org
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
Corresponding author: E. Polehampton, email@example.com
Accepted: 19 June 2003
The frequencies and line strengths of the /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 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
© ESO, 2003
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