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Direct Evidence for Maser Emission from the 36.2GHz Class I Transition of Methanol in NGC253
Chen, Xi1,2,4; Ellingsen, Simon P.3; Shen, Zhi-Qiang2,4; McCarthy, Tiege P.3; Zhong, Wei-Ye2,4; Deng, Hui1
2018-04-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume856Issue:2Pages:6
Corresponding AuthorChen, Xi(chenxi@gzhu.edu.cn)
AbstractObservations made with the Jansky Very large Array (JVLA) at an angular resolution of similar to 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 similar to 6 ''(0.1 kpc) and similar to 0 ''.05 (1 pc), respectively. The strongest components have a brightness temperature of > 10(3) K, much higher than the maximum kinetic temperature (similar to 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.
Keywordgalaxies: starburst ISM: molecules masers stars: formation
DOI10.3847/2041-8213/aab894
WOS KeywordSTAR-FORMATION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000429051000002
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22413
Collection中国科学院紫金山天文台
Corresponding AuthorChen, Xi
Affiliation1.GuangZhou Univ, Ctr Astrophys, Guangzhou 510006, Guangdong, Peoples R China
2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
3.Univ Tasmania, Sch Nat Sci, Hobart, Tas 7001, Australia
4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Chen, Xi,Ellingsen, Simon P.,Shen, Zhi-Qiang,et al. Direct Evidence for Maser Emission from the 36.2GHz Class I Transition of Methanol in NGC253[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,856(2):6.
APA Chen, Xi,Ellingsen, Simon P.,Shen, Zhi-Qiang,McCarthy, Tiege P.,Zhong, Wei-Ye,&Deng, Hui.(2018).Direct Evidence for Maser Emission from the 36.2GHz Class I Transition of Methanol in NGC253.ASTROPHYSICAL JOURNAL LETTERS,856(2),6.
MLA Chen, Xi,et al."Direct Evidence for Maser Emission from the 36.2GHz Class I Transition of Methanol in NGC253".ASTROPHYSICAL JOURNAL LETTERS 856.2(2018):6.
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