The Detection of New Methanol Masers in the 5_{-1}-4_0E Line

Details The Detection of New Methanol Masers in the 5_{-1}-4_0E Line The Detection of New Methanol Masers in the 5_{-1}-4_0E Line

2001-06-07

arxiv.org/abs/astro-ph/0106132v1

Astron.Rep. 45 (2001) 26-33

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1134/1.1336598

Fifty-one objects in the 5_{-1}-4_0E methanol line at 84.5 GHz were detected during a survey of Class I maser sources. Narrow maser features were found in 17 of these. Broad quasi-thermal lines were detected towards other sources. One of the objects with narrow features, the young bipolar outflow L 1157 was also observed in the 8_0-7_1A+ line at 95.2 GHz; a narrow line was detected at this frequency. Analysis showed that the broad lines are usually inverted. The quasi-thermal profiles imply that the line opacities are not larger than several units. These results confirm the plausibility of models in which compact Class I masers appear in extended sources as a result of an appropriate velocity field. Measurements of linear polarization at 84.5 GHz in 13 sources were made. No polarization was found except a tentative detection of a weak polarization in M 8E.

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