Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26as..143..269s&link_type=abstract
Astronomy and Astrophysics Supplement, v.143, p.269-301
Astronomy and Astrophysics
Astrophysics
122
Masers, Surveys, Stars: Formation, Ism: Molecules, Radio Lines: Ism, Hii Regions
Scientific paper
We report the first results of a search for 6.7 GHz methanol masers in the direction of 1399 IRAS objects north of declination -20deg with the flux densities greater than 100 Jy at 60 mu m and the flux density ratio F60/F25>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 Toruń 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. Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html
Hrynek G.
Kus Andrzej J.
Szymczak Marian
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