NAOC Open IR
Variability in extragalactic class I methanol masers: new maser components towards NGC 4945 and NGC 253
McCarthy, T. P.1,2; Ellingsen, S. P.1; Breen, S. L.3; Voronkov, M. A.2; Chen, X.4,5; Qiao, H-h5,6
2020-02-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume491Issue:4Pages:4642-4655
AbstractWe 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).
Keywordmasers galaxies: starburst radio lines: galaxies
Funding OrganizationCommonwealth 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
DOI10.1093/mnras/stz3098
WOS KeywordCH3OH MASER ; GALAXY ; STARBURST ; EMISSION ; REGIONS ; FLARES ; GHZ ; END ; OH
Language英语
Funding ProjectCommonwealth of Australia ; National Aeronautics and Space Administration
Funding OrganizationCommonwealth 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
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000512310600005
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/54020
Collection中国科学院国家天文台
Corresponding AuthorMcCarthy, T. P.
Affiliation1.Univ Tasmania, Sch Nat Sci, Private Bag 37, Hobart, Tas 7001, Australia
2.CSIRO, Australia Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia
3.Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia
4.GuangZhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China
5.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
6.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Shaanxi, Peoples R China
Recommended Citation
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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