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

S. V. Kalenskii·V. I. Slysh·I. E. Val'tts·A. Winngerg·L. E. B. Johansson
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Abstract

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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S. V. Kalenskii, V. I. Slysh, I. E. Val'tts, A. Winngerg, L. E. B. Johansson. 2001-06-07. The Detection of New Methanol Masers in the 5_{-1}-4_0E Line. https://doi.org/10.1134/1.1336598

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