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Discovery of a new class I methanol maser transition at 266.8 GHz

Citation

Chen, X and Ellingsen, SP and Ren, Z-Y and Sobolev, AM and Parfenov, S and Shen, Z-Q, Discovery of a new class I methanol maser transition at 266.8 GHz, Astrophysical Journal, 877, (2) Article 90. ISSN 0004-637X (2019) [Refereed Article]


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© 2019. The American Astronomical Society. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0) http://creativecommons.org/licenses/by/3.0/

DOI: doi:10.3847/1538-4357/ab1078

Abstract

We report the detection of a new class I methanol maser candidate from the 52-41 E transition (266.8 GHz). This methanol transition has been detected toward a nearby high-mass star-forming region G352.630-1.067 (distance ∼0.7 kpc), in Submillimeter Array (SMA) observations. The new candidate transition has a similar spatial distribution as the 42-31 E (218.4 GHz) and 8-1-70 E (229.7 GHz) transitions, which are known class I maser transitions. Thermal methanol emission in this source is confined to a central hot core, while the three class I maser transitions are detected in two additional regions. These two maser-only emission regions are clearly associated with shocked gas traced by 2 μm Ks-band and thermal v = 0, J = 5-4 SiO molecular emission. In contrast to the thermal methanol emission from the hot core, the three class I maser transitions show an positive trend in the rotation diagram for the two maser regions. Large velocity gradient modeling of the 266.8, 218.4, and 229.7 GHz transitions shows that the 266.8 GHz transition can be a maser for a wide range of conditions. The intensity ratios for the three methanol transitions detected in maser regions can be reproduced under conditions that are typical for class I methanol maser sites. These facts all support the hypothesis that the detected emission from the 266.8 GHz methanol (52−41 E) transition is masing.

Item Details

Item Type:Refereed Article
Keywords:ISM: jets and outflows – ISM: molecules – masers – stars: formation
Research Division:Physical Sciences
Research Group:Astronomical and Space 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:136268
Year Published:2019
Funding Support:Australian Research Council (DP180101061)
Web of Science® Times Cited:1
Deposited By:Mathematics and Physics
Deposited On:2019-12-11
Last Modified:2020-05-20
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