Issue |
A&A
Volume 387, Number 1, May III 2002
|
|
---|---|---|
Page(s) | 310 - 316 | |
Section | The Sun | |
DOI | https://doi.org/10.1051/0004-6361:20020358 | |
Published online | 15 May 2002 |
Torsionally excited methanol at 44.9 GHz
1
Astro Space Center, Profsouznaya st. 84/32, 117997 Moscow, Russia
2
The Catholic University of America, 620 Michigan Ave., Washington, DC 20064, USA
3
Maria Mitchell Observatory, 59 Milk st., Nantucket, MA 02554, USA
4
Astronomical Observatory, Ural State University, Lenin st. 51, 620083 Ekaterinburg, Russia
Corresponding author: M. A. Voronkov, voronkov@tanatos.asc.rssi.ru
Received:
17
July
2001
Accepted:
6
March
2002
Using the Haystack Observatory 37-m radio telescope we have
undertaken a search for emission in the E rotational transition of
methanol in its first torsionally excited state (
) at 44.9 GHz. We
examined seven galactic sources – six strong emitters of Class II methanol
maser lines and Orion KL, the only source where this line had been previously
detected. We confirm (at a level of
) the previous detection and
report two new detections – a reliable (
) detection in W3(OH)
and a marginal (
) detection in NGC 6334F. Upper limits for other
sources are presented. Although we did not see obvious
signatures of maser amplification in this transition in any source, arguments
in favor of weak masing in W3(OH) are presented.
Key words: masers / ISM: molecules / ISM: individual objects: W3(OH), Orion KL, NGC 6334F / stars: formation
© ESO, 2002
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.