NAOC Open IR
New Ammonia Masers in the High-mass Star-forming Region Sgr B2(N)
Mei, Ying1,2,3,4; Chen, Xi1,2,3,4; Shen, Zhi-Qiang5; Li, Bin5
2020-08-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume898Issue:2Pages:8
AbstractWe report a systemic search for nonmetastable NH(3)masers toward a high-mass star-forming region Sgr B2(N) using the Shanghai 65 m Tianma radio telescope with itsKu-band (12-18 GHz) andK-band (18-26.5 GHz) receivers. A total of 18 maser emission transitions were detected, and eight of these are newly identified NH(3)maser transitions in interstellar space. Most (five) of the new maser transitions were found from theKu-band observations which were absent from previous searches. Rotation diagram analysis for the 18 quasi-thermal transitions derived a high gas kinematic temperature (similar to 400 K) and an extremely high H(2)column density (similar to 5 x 10(25)cm(-2)). Such conditions suggest that the NH(3)masers are likely pumped by vibrational excitation. Compared with quiet maser activity observed more than 20 yr ago, NH(3)masers may be bursting in our observation time when the gas kinematic temperature might increase from similar to 150 to similar to 400 K. As extreme conditions (either high gas kinematic temperature and/or high gas column density) are required to excite nonmetastable NH(3)masers, it can be argued that the detected NH(3)maser outburst may be linked to a more intensive accretion-burst event from an high-mass young stellar object in the Sgr B2(N) region.
KeywordInterstellar masers Interstellar line emission Molecular clouds Molecular gas Molecular spectroscopy Star formation Galactic center
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019)
DOI10.3847/1538-4357/ab9b90
WOS KeywordMOLECULAR-SPECTROSCOPY ; COLOGNE DATABASE ; MULTILEVEL ; SUBMILLIMETER ; MILLIMETER ; EMISSION ; LINE ; NH3
Language英语
Funding ProjectNational Natural Science Foundation of China[11590781] ; National Natural Science Foundation of China[11873002] ; National Natural Science Foundation of China[11590780] ; National Natural Science Foundation of China[11903009] ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019)
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019) ; Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2019)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000560045300001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82348
Collection中国科学院国家天文台
Corresponding AuthorChen, Xi
Affiliation1.Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China
2.Dept Educ Guangdong Prov, Astron Sci & Technol Res Lab, Guangzhou 510006, Peoples R China
3.Key Lab Astron Observat & Technol Guangzhou, Guangzhou 510006, Peoples R China
4.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
5.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Mei, Ying,Chen, Xi,Shen, Zhi-Qiang,et al. New Ammonia Masers in the High-mass Star-forming Region Sgr B2(N)[J]. ASTROPHYSICAL JOURNAL,2020,898(2):8.
APA Mei, Ying,Chen, Xi,Shen, Zhi-Qiang,&Li, Bin.(2020).New Ammonia Masers in the High-mass Star-forming Region Sgr B2(N).ASTROPHYSICAL JOURNAL,898(2),8.
MLA Mei, Ying,et al."New Ammonia Masers in the High-mass Star-forming Region Sgr B2(N)".ASTROPHYSICAL JOURNAL 898.2(2020):8.
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