A&A 413, 233-240 (2004)
DOI: 10.1051/0004-6361:20031451

12.2 GHz survey towards 6.7 GHz methanol masers

A comparison of 12.2 GHz and 6.7 GHz spectra

L. Blaszkiewicz and A. J. Kus

Torun Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, 87-100 Torun, Poland
(Received 4 March 2003 / Accepted 19 August 2003)

Abstract
We present results of a 12.2 GHz methanol maser survey done with the Torun 32 m radio telescope. We examined 261 star forming-sites, known as containing 6.7 GHz maser emission sources. The survey resulted in 49 sources with maser line detection, with 21 previously unknown emissions. All detected 12.2 GHz masers have been observed at the 6.7 GHz transition. Only one 12.2 GHz source had no 6.7 GHz counterpart. We compared basic spectral line properties at both transitions. In a few cases we observed absorption features and emitting counterparts in the other monitored frequency, at the same velocity.

Key words: masers - surveys - stars: formation - ISM: molecules - radio lines: ISM - ISM: HII regions

Offprint request: L. Blaszkiewicz, leszekb@matman.uwm.edu.pl

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