| Issue |
A&A
Volume 406, Number 2, August I 2003
|
|
|---|---|---|
| Page(s) | L47 - L50 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20030932 | |
| Published online | 17 November 2003 | |
Letter to the Editor
Far-infrared detection of 
OH towards Sagittarius B2
*
1
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
2
Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, UK e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
3
Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
4
Laboratoire d'Astrophysique de Marseille, CNRS & Université de Provence, BP 8, 13376 Marseille Cedex 12, France e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Corresponding author: E. Polehampton, This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
31
January
2003
Accepted:
19
June
2003
Abstract
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
Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the United Kingdom) with the participation of ISAS and NASA.
© ESO, 2003
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