Detection of 36 GHz Class I Methanol Maser Emission toward NGC 4945

doi:10.3847/1538-4357/aa872c

	Detection of 36 GHz Class I Methanol Maser Emission toward NGC 4945
	McCarthy,Tiege P 1,2; Ellingsen,Simon P.1; Chen,Xi 3,4; Breen,Shari L.5; Voronkov,Maxim A.2; Qiao,Hai-hua 4,6
刊名	The Astrophysical Journal
	2017-09-13
卷号	846 期号:2
关键词	masers galaxies: individual (NGC 4945) galaxies: starburst radio lines: ISM
ISSN号	0004-637X
DOI	10.3847/1538-4357/aa872c
英文摘要	Abstract We have searched for emission from the 36.2 GHz ( 4 ? 1 → 3 0 E ) methanol transition toward NGC 4945, using the Australia Telescope Compact Array. 36.2 GHz methanol emission was detected offset southeast from the Galactic nucleus. The methanol emission is narrow, with a line width <10 km s?1 and a luminosity five orders of magnitude higher than Galactic class I masers from the same transition. These characteristics combined the with physical separation from the strong central thermal emission suggests that the methanol emission is a maser. This emission is a factor of ～90 more luminous than the widespread emission detected from the Milky Way central molecular zone. This is the fourth detection of extragalactic class I emission and the third detection of extragalactic 36.2 GHz maser emission. These extragalactic class I methanol masers do not appear to be simply highly luminous variants of Galactic class I emission and instead appear to trace large-scale regions of low-velocity shocks in molecular gas, which may precede, or be associated with, the early stages of large-scale star formation.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-846-2-AA872C
内容类型	期刊论文
源URL	[http://210.72.145.45/handle/361003/10686]
专题	中国科学院国家授时中心
作者单位	1.School of Physical Sciences, University of Tasmania, Hobart, TAS 7001, Australia; tiegem@utas.edu.au 2.Australia Telescope National Facility, CSIRO, P.O. Box 76, Epping, NSW 1710, Australia 3.Center for Astrophysics, GuangZhou University, Guangzhou 510006, China 4.Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China 5.Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, Sydney, NSW 2006, Australia 6.National Time Service Center, Chinese Academy of Sciences, Xi’An, Shaanxi 710600, China
推荐引用方式 GB/T 7714	McCarthy,Tiege P,Ellingsen,Simon P.,Chen,Xi,et al. Detection of 36 GHz Class I Methanol Maser Emission toward NGC 4945[J]. The Astrophysical Journal,2017,846(2).
APA	McCarthy,Tiege P,Ellingsen,Simon P.,Chen,Xi,Breen,Shari L.,Voronkov,Maxim A.,&Qiao,Hai-hua.(2017).Detection of 36 GHz Class I Methanol Maser Emission toward NGC 4945.The Astrophysical Journal,846(2).
MLA	McCarthy,Tiege P,et al."Detection of 36 GHz Class I Methanol Maser Emission toward NGC 4945".The Astrophysical Journal 846.2(2017).