期刊
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES
卷 143, 期 2, 页码 269-301出版社
E D P SCIENCES
DOI: 10.1051/aas:2000334
关键词
masers; surveys; stars : formation; ISM : molecules; radio lines : ISM; HII regions
We report the first results of a search for 6.7 GHz methanol masers in the direction of 1399 IRAS objects: north of declination -20 degrees with the flux densities greater than 100 Jy at 60 mu m and the flux density ratio F-60/F-25 > 1. Observations were made with the sensitivity of 1.7 Jy and the velocity resolution of 0.04 km s(-1) using the 32-m Torun radio telescope. Maser emission was found in 182 sources, including 70 new detections. 32 new sources were identified with objects of radio emission associated with star-forming regions. Comparison of the present data set with other observations suggests that about 65% of methanol masers exhibit moderate or strong variations on time-scales of about 4 and 8 years.
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