Variability in extragalactic class I methanol masers: new maser components towards NGC 4945 and NGC 253

doi:10.1093/mnras/stz3098

CORC > 国家授时中心 > 中国科学院国家授时中心 > 守时理论与方法研究室

	Variability in extragalactic class I methanol masers: new maser components towards NGC 4945 and NGC 253
	McCarthy, T. P.5,6; Ellingsen, S. P.6; Breen, S. L.4; Voronkov, M. A.5; Chen, X.2,3; Qiao, H-h 1,2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2020-02-01
卷号	491 期号:4 页码:4642-4655
关键词	masers galaxies: starburst radio lines: galaxies
ISSN号	0035-8711
DOI	10.1093/mnras/stz3098
英文摘要	We have used the Australia Telescope Compact Array (ATCA) to make new observations of the 36.2-GHz (4(-1) -> 3(0)E) methanol transition towards NGC 4945 and NGC 253. These observations have revealed the presence of new maser components towards these galaxies, and have provided the first clear evidence for variability in extragalactic class I methanol masers. Alongside the new observations of NGC 4945 and NGC 253, we present the results of recent 36.2-GHz methanol maser searches towards 12 galaxies, placing upper limits on the emission from the 36.2-GHz class I transition and the 37.7-GHz (7(2) -> 8(1)E) class II maser line towards these sources. Flux density values for the 7-mm continuum emission towards these sources are also reported where applicable. A re-analysis of the published 36.2-GHz methanol observations of Arp 220 undertaken as part of the search revealed some issues with previous imaging procedures. The re-analysis, combined with non-detections in independent follow-up observations, suggests that there is no 36.2-GHz methanol emission towards Arp 220 stronger than 3.5 mJy in a 10 km s(-1) channel (5 sigma upper limit).
资助项目	Commonwealth of Australia ; National Aeronautics and Space Administration
WOS关键词	CH3OH MASER ; GALAXY ; STARBURST ; EMISSION ; REGIONS ; FLARES ; GHZ ; END ; OH
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000512310600005
资助机构	Commonwealth of Australia ; Commonwealth of Australia ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; Commonwealth of Australia ; Commonwealth of Australia ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; Commonwealth of Australia ; Commonwealth of Australia ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; Commonwealth of Australia ; Commonwealth of Australia ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration
内容类型	期刊论文
源URL	[http://210.72.145.45/handle/361003/9585]
专题	国家授时中心_守时理论与方法研究室
通讯作者	McCarthy, T. P.
作者单位	1.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Shaanxi, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 3.GuangZhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China 4.Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia 5.CSIRO, Australia Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia 6.Univ Tasmania, Sch Nat Sci, Private Bag 37, Hobart, Tas 7001, Australia
推荐引用方式 GB/T 7714	McCarthy, T. P.,Ellingsen, S. P.,Breen, S. L.,et al. Variability in extragalactic class I methanol masers: new maser components towards NGC 4945 and NGC 253[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,491(4):4642-4655.
APA	McCarthy, T. P.,Ellingsen, S. P.,Breen, S. L.,Voronkov, M. A.,Chen, X.,&Qiao, H-h.(2020).Variability in extragalactic class I methanol masers: new maser components towards NGC 4945 and NGC 253.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,491(4),4642-4655.
MLA	McCarthy, T. P.,et al."Variability in extragalactic class I methanol masers: new maser components towards NGC 4945 and NGC 253".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 491.4(2020):4642-4655.