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Direct evidence for maser emission from the 36.2GHz class I transition of methanol in NGC253


Chen, X and Ellingsen, SP and Shen, Z-Q and McCarthy, TP and Zhong, W-Y and Deng, H, Direct evidence for maser emission from the 36.2GHz class I transition of methanol in NGC253, Astrophysical Journal Letters, 856, (2) Article L35. ISSN 2041-8205 (2018) [Refereed Article]


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Copyright 2018 The American Astronomical Society. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0)

DOI: doi:10.3847/2041-8213/aab894


Observations made with the Jansky Very large Array (JVLA) at an angular resolution of ∼0."1 have detected class I methanol maser emission from the 36.2 GHz transition toward the starburst galaxy NGC 253. The methanol emission is detected toward four sites which lie within the regions of extended methanol emission detected in previous lower angular resolution (a few arcseconds) observations. The peak flux densities of the detected compact components are in the range 3-9 mJy beam-1. Combining the JVLA data with single-dish observations from the Shanghai Tianma Radio Telescope (TMRT) and previous interferometric observations with the Australia Telescope Compact Array (ATCA), we show that the 36.2 GHz class I methanol emission consists of both extended and compact structures, with typical scales of ∼6'' (0.1 kpc) and ∼0."05 (1 pc), respectively. The strongest components have a brightness temperature of >103 K, much higher than the maximum kinetic temperature (∼100 K) of the thermal methanol emission from NGC 253. Therefore, these observations conclusively demonstrate for the first time the presence of maser emission from a class I methanol transition in an external galaxy.

Item Details

Item Type:Refereed Article
Keywords:galaxies: starburst; ISM: molecules; masers; stars: formation
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic 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:128641
Year Published:2018
Web of Science® Times Cited:10
Deposited By:Mathematics and Physics
Deposited On:2018-10-04
Last Modified:2019-02-27
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