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The detection of new methanol masers in the 5−1 — 40E Line

Published online by Cambridge University Press:  03 August 2017

Sergei V. Kalenskii ,
Vyacheslav I. Slysh ,
Irina E. Val'tts ,
Anders Winnberg  and
Lars E. B. Johansson
Sergei V. Kalenskii
Affiliation:
Astro Space Center, Lebedev's Physical Institute, Profsoyuznaya str. 84/32, 117810 Moscow, Russia
Vyacheslav I. Slysh
Affiliation:
Astro Space Center, Lebedev's Physical Institute, Profsoyuznaya str. 84/32, 117810 Moscow, Russia
Irina E. Val'tts
Affiliation:
Astro Space Center, Lebedev's Physical Institute, Profsoyuznaya str. 84/32, 117810 Moscow, Russia
Anders Winnberg
Affiliation:
Onsala Space Observatory, S-439 92 Onsala, Sweden
Lars E. B. Johansson
Affiliation:
Onsala Space Observatory, S-439 92 Onsala, Sweden

Abstract

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Fifty-one objects in the 5−1 − 40E methanol line at 84.5 GHz was 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 80 − 71A+ 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.

Type
Part 1. Star Formation
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 195 - 198
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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