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The Brightest Known H2CO Maser in the Milky Way: G339.88-1.26
Chen, Xi1,2; Shen, Zhi-Qiang2,3; Ellingsen, Simon P.4; Li, Xiao-Qiong2,5; Yang, Kai2,5; Chen, Hong-Ying2,5; Dong, Jian2,3
2017-12-10
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume851Issue:1Pages:5
Corresponding AuthorChen, Xi(chenxi@gzhu.edu.cn)
AbstractWe report the detection of the strongest l(01)-l(11) 6 cm H2CO emission in our Galaxy. The detection toward the massive star-forming region G339.88-1.26 was made using the Shanghai Tianma radio telescope (TMRT). The G339.88-1.26 star formation region hosts one of the strongest 6.7 GHz methanol masers and has an accompanying collimated, ionized jet seen in radio continuum free-free emission. The peak flux density of the detected H2CO emission is similar to 19 Jy, one order of magnitude stronger than the nine previously known H2CO maser sources. The corresponding luminosity is also brighter than has been observed in previous H2CO maser sources, even those detected in the Central Molecular Zone of our Galaxy. A TMRT on-the-fly map of the region shows a point-like source structure and this, combined with the spectral characteristics of the H2CO emission (multiple, narrow components), leads us to conclude that the detected H2CO emission is masing (with a brightness temperature in excess of 104 K). The detection of a very strong H2CO maser in G339.88-1.26 suggests that ionized jet/outflow environments might provide efficient maser pumping for this transition, with the ionized jet/outflow-driven shock causing collisional excitation, and are also able to provide additional seed photons for maser amplification of the radio continuum emission.
KeywordISM: molecules masers radio lines: ISM stars: formation
DOI10.3847/2041-8213/aa9b2c
WOS KeywordLARGE ARRAY OBSERVATIONS ; YOUNG STELLAR OBJECTS ; BASE-LINE ARRAY ; 6 CM EMISSION ; FORMALDEHYDE MASERS ; METHANOL MASERS ; SEARCH ; CATALOG
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000417542100003
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22137
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.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
4.Univ Tasmania, Sch Phys Sci, Hobart, Tas 7001, Australia
5.Univ Chinese Acad Sci, 19A Yuquanlu, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Chen, Xi,Shen, Zhi-Qiang,Ellingsen, Simon P.,et al. The Brightest Known H2CO Maser in the Milky Way: G339.88-1.26[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,851(1):5.
APA Chen, Xi.,Shen, Zhi-Qiang.,Ellingsen, Simon P..,Li, Xiao-Qiong.,Yang, Kai.,...&Dong, Jian.(2017).The Brightest Known H2CO Maser in the Milky Way: G339.88-1.26.ASTROPHYSICAL JOURNAL LETTERS,851(1),5.
MLA Chen, Xi,et al."The Brightest Known H2CO Maser in the Milky Way: G339.88-1.26".ASTROPHYSICAL JOURNAL LETTERS 851.1(2017):5.
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