Formaldehyde and H110 alpha observations towards 6.7 GHz methanol maser sources

CORC > 新疆天文台 > 研究单元未命名 > 射电天文研究室 > 恒星形成与演化研究团组

	Formaldehyde and H110 alpha observations towards 6.7 GHz methanol maser sources
	Okoh, Daniel1,2,3 ; Esimbek, Jarken1 ; Zhou, Jian Jun1 ; Di Tang, Xin1 ; Chukwude, Augustine 3; Urama, Johnson 3; Okeke, Pius 2
刊名	ASTROPHYSICS AND SPACE SCIENCE
	2014-04-01
卷号	350 期号:2 页码:657-681
关键词	Molecular clouds-ISM molecule-stars formation
英文摘要	Intriguing work on observations of 4.83 GHz formaldehyde (H2CO) absorptions and 4.87 GHz H110 alpha radio recombination lines (RRLs) towards 6.7 GHz methanol (CH3OH) maser sources is presented. Methanol masers provide ideal sites to probe the earliest stages of massive star formation, while 4.8 GHz formaldehyde absorptions are accurate probes of physical conditions in dense (10(3)-10(5) cm(-3)) and low temperature molecular clouds towards massive star forming regions. The work is aimed at studying feature similarities between the formaldehyde absorptions and the methanol masers so as to expand knowledge of events and physical conditions in massive star forming regions. A total of 176 methanol maser sources were observed for formaldehyde absorptions, and formaldehyde absorptions were detected 138 of them. 53 of the formaldehyde absorptions were newly detected. We noted a poor correlation between the methanol and formaldehyde intensities, an indication that the signals (though arise from about the same regions) are enhanced by different mechanisms. Our results show higher detection rates of the formaldehyde lines for sources with stronger methanol signals. The strongest formaldehyde absorptions were associated with IRAS sources and IRDCs that have developed HII regions, and that do not have EGOs.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	H-II REGIONS ; RECOMBINATION LINE EMISSION ; LARGE ARRAY OBSERVATIONS ; DENSE MOLECULAR CLOUDS ; STAR-FORMING REGIONS ; DARK DUST CLOUDS ; INTERSTELLAR FORMALDEHYDE ; H2CO ABSORPTION ; GALACTIC-CENTER ; 6-CENTIMETER H2CO
收录类别	SCI
语种	英语
WOS记录号	WOS:000332664500028
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/621]
专题	恒星形成与演化研究团组新疆天文台_射电天文研究室新疆天文台_其它
作者单位	1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 2.Univ Nigeria, Ctr Basic Space Sci, Nsukka 410001, Nigeria 3.Univ Nigeria, Dept Phys & Astron, Nsukka 410001, Nigeria
推荐引用方式 GB/T 7714	Okoh, Daniel,Esimbek, Jarken,Zhou, Jian Jun,et al. Formaldehyde and H110 alpha observations towards 6.7 GHz methanol maser sources[J]. ASTROPHYSICS AND SPACE SCIENCE,2014,350(2):657-681.
APA	Okoh, Daniel.,Esimbek, Jarken.,Zhou, Jian Jun.,Di Tang, Xin.,Chukwude, Augustine.,...&Okeke, Pius.(2014).Formaldehyde and H110 alpha observations towards 6.7 GHz methanol maser sources.ASTROPHYSICS AND SPACE SCIENCE,350(2),657-681.
MLA	Okoh, Daniel,et al."Formaldehyde and H110 alpha observations towards 6.7 GHz methanol maser sources".ASTROPHYSICS AND SPACE SCIENCE 350.2(2014):657-681.