Issue |
A&A
Volume 533, September 2011
|
|
---|---|---|
Article Number | L11 | |
Number of page(s) | 4 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361/201117753 | |
Published online | 07 September 2011 |
Letter to the Editor
The rotational spectrum of protonated sulfur dioxide, HOSO+
1
Harvard-Smithsonian Center for Astrophysics, 60 Garden St.,
Cambridge,
MA
02138
USA
e-mail: vlattanzi@cfa.harvard.edu
2
School of Engineering & Applied Sciences, Harvard
University, 29 Oxford
St., Cambridge,
MA
02138,
USA
3
I. Physikalisches Institut, Universität zu Köln,
Zülpicher Str. 77, 50937
Köln,
Germany
Received: 21 July 2011
Accepted: 19 August 2011
Aims. We report on the millimeter-wave rotational spectrum of protonated sulfur dioxide, HOSO+.
Methods. Ten rotational transitions between 186 and 347 GHz have been measured to high accuracy in a negative glow discharge.
Results. The present measurements improve the accuracy of the previously reported centimeter-wave spectrum by two orders of magnitude, allowing a frequency calculation of the principal transitions to about 4 km s-1 in equivalent radial velocity near 650 GHz, or one linewidth in hot cores and corinos.
Conclusions. Owing to the high abundance of sulfur-bearing molecules in many galactic molecular sources, the HOSO+ ion is an excellent candidate for detection, especially in hot cores and corinos in which SO2 and several positive ions are prominent.
Key words: ISM: molecules / radio lines: ISM / molecular processes / molecular data / line: identification
© ESO, 2011
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