H2CO Observations Towards CH3OH 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

	H2CO Observations Towards CH3OH Maser Sources
	Okoh, Daniel1,2,3 ; Esimbek, Jarken1 ; Zhou, JianJun1 ; Tang, Xindi1 ; Chukwude, Augustine 3; Urama, Johnson 3; Okeke, Pius 2
	2013-03-21
会议名称	IAU Symposium 292: Molecular Gas, Dust, and Star Formation in Galaxies
会议日期	20 - 24 August 2012
通讯作者邮箱	okodan2003@gmail.com
会议地点	Beijing, China
关键词	radio lines: ISM ISM: molecules stars: formation
卷号	292
页码	111-111
通讯作者	Okoh, Daniel
英文摘要	Formaldehyde (H2CO) is an accurate probe of physical conditions in dense and low-temperature molecular clouds towards massive star formation regions, while 6.7 GHz methanol (CH3OH) masers provide ideal sites to probe the earliest stages of massive stellar formation. We present preliminary results of our investigation into the possible relationship between formaldehyde and methanol astrophysical masers with the view to expanding knowledge on massive star formation processes. Observations are done using the Nanshan 25m radio telescope of the Xinjiang Astronomical Observatories, Urumqi, China. 127 Methanol sources (from the work of Green et al. 2010, Xu et al. 2003, Pestalozzi et al. 2005, and Xu et al. 2009) have been observed so far for 4.8 GHz formaldehyde absorption lines, and H2CO signals have been detected in 86 of them, 31 of which are newly discovered. We obtained good correlation (0.85 correlation coefficient) between the velocities of the sources, and a poor correlation (-0.03 correlation coefficient) between their intensities, an indication that signals from the two lines originate from about the same region, but that the excitation mechanisms that drive them are likely different.
会议主办者	IAU
会议网址	http://www.a.phys.nagoya-u.ac.jp/IAUS292/
会议录	Molecular Gas, Dust, and Star Formation, Proceedings of the International Astronomical Union, IAU Symposium 292
会议录出版者	Cambridge University Press
语种	英语
ISBN号	978-1-107-03381-8
内容类型	会议论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/983]
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.Xinjiang Astronomical Observatory, CAS, Urumqi 830011, China 2.Center for Basic Space Science, University of Nigeria, Nsukka 410001, Nigeria 3.Physics & Astronomy Department, University of Nigeria, Nsukka 410001, Nigeria
推荐引用方式 GB/T 7714	Okoh, Daniel,Esimbek, Jarken,Zhou, JianJun,et al. H2CO Observations Towards CH3OH Maser Sources[C]. 见:IAU Symposium 292: Molecular Gas, Dust, and Star Formation in Galaxies. Beijing, China. 20 - 24 August 2012.http://www.a.phys.nagoya-u.ac.jp/IAUS292/.