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44GHz methanol masers: observations toward 95GHz methanol masers

Yang, W, Xu, Y, Choi, YK, Ellingsen, SP ORCID: 0000-0002-1363-5457, Sobolev, AM, Chen, X, Li, J and Lu, D 2020 , '44GHz methanol masers: observations toward 95GHz methanol masers' , The Astrophysical Journal Supplement Series, vol. 248 , pp. 1-16 , doi: 10.3847/1538-4365/ab8b5b.

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Abstract

We report a simultaneous 44 and 95 GHz class I methanol maser survey toward 144 sources from the 95 GHz class I methanol maser catalog. The observations were made with the three telescopes of the Korean very long baseline interferometry network operating in single-dish mode. The detection rates are 89% at 44 GHz and 77% at 95 GHz. There are 106 new discoveries at 44 GHz. Comparing the previous 95 GHz detections with new observations of the same transitions made using the Purple Mountain Observatory 13.7 m radio telescope shows no clear evidence of variability on a timescale of six years. Emission from the 44 and 95 GHz transitions shows strong correlations in peak velocity, peak flux density, and integrated flux density, indicating that they are likely cospatial. We found that the peak flux density ratio Spk,95/Spk,44 decreases as the 44 GHz peak flux density increases. We found that some class I methanol masers in our sample might be associated with infrared dark clouds, while others are associated with H II regions, indicating that some sources occur at an early stage of high-mass star formation, while others are located toward more evolved sources.

Item Type: Article
Authors/Creators:Yang, W and Xu, Y and Choi, YK and Ellingsen, SP and Sobolev, AM and Chen, X and Li, J and Lu, D
Keywords: star formation, interstellar masers, radio sources, interstellar molecules
Journal or Publication Title: The Astrophysical Journal Supplement Series
Publisher: Univ Chicago Press
ISSN: 0067-0049
DOI / ID Number: 10.3847/1538-4365/ab8b5b
Copyright Information:

Copyright 2020 The American Astronomical Society

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