The Brightest Known H2CO Maser in the Milky Way: G339.88-1.26

doi:10.3847/2041-8213/aa9b2c

	The Brightest Known H2CO Maser in the Milky Way: G339.88-1.26
	Chen, Xi 1,2; Shen, Zhi-Qiang 2,3; Ellingsen, Simon P.4; Li, Xiao-Qiong 2,5; Yang, Kai 2,5; Chen, Hong-Ying 2,5; Dong, Jian 2,3
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2017-12-10
卷号	851 期号:1 页码:5
关键词	ISM: molecules masers radio lines: ISM stars: formation
ISSN号	2041-8205
DOI	10.3847/2041-8213/aa9b2c
通讯作者	Chen, Xi(chenxi@gzhu.edu.cn)
英文摘要	We 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.
WOS关键词	LARGE ARRAY OBSERVATIONS ; YOUNG STELLAR OBJECTS ; BASE-LINE ARRAY ; 6 CM EMISSION ; FORMALDEHYDE MASERS ; METHANOL MASERS ; SEARCH ; CATALOG
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000417542100003
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/22136]
专题	中国科学院紫金山天文台
通讯作者	Chen, Xi
作者单位	1.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
推荐引用方式 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.