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: 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
Corresponding author: E. Polehampton, epoleham@mpifr-bonn.mpg.de
Received:
31
January
2003
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.