The detection of new methanol masers in the 5?1–40
E line |
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Authors: | S V Kalenskii V I Slysh I E Val’tts A Winnberg L E Johansson |
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Institution: | (1) Astro Space Center, Profsoyuznaya ul. 84/32, Moscow, 117810, Russia;(2) Onsala Space Observatory, S-439 Onsala 92, Sweden |
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Abstract: | Forty-eight objects were detected in the 5?1–40 E methanol line at 84.5 GHz during a survey of Class I maser sources. Narrow maser features were found in 14 of these. Broad quasi-thermal lines were detected toward other sources. One of the objects with narrow features at 84.5 GHz, the young bipolar outflow L1157, was also observed in the 80–71 A + 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 there are no more than a few line opacities. These results confirm the plausibility of models in which compact Class I masers appear in extended sources as a result of a preferential velocity field. |
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