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44GHz methanol masers: observations toward 95GHz methanol masers

Citation

Yang, W and Xu, Y and Choi, YK and Ellingsen, SP and Sobolev, AM and Chen, X and Li, J and Lu, D, 44GHz methanol masers: observations toward 95GHz methanol masers, The Astrophysical Journal Supplement Series, 248 Article 18. ISSN 0067-0049 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 The American Astronomical Society

DOI: doi:10.3847/1538-4365/ab8b5b

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 Details

Item Type:Refereed Article
Keywords:star formation, interstellar masers, radio sources, interstellar molecules
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Ellingsen, SP (Professor Simon Ellingsen)
ID Code:140105
Year Published:2020
Web of Science® Times Cited:1
Deposited By:Physics
Deposited On:2020-07-27
Last Modified:2020-08-25
Downloads:0

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