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

文献类型：期刊论文

作者McCarthy, T. P.5,6; Ellingsen, S. P.6; Breen, S. L.4; Voronkov, M. A.5; Chen, X.2,3; Qiao, H-h1,2
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期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
DOI10.1093/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).
WOS关键词CH3OH MASER ; GALAXY ; STARBURST ; EMISSION ; REGIONS ; FLARES ; GHZ ; END ; OH
资助项目Commonwealth of Australia ; National Aeronautics and Space Administration
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000512310600005
出版者OXFORD UNIV PRESS
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
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.

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