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H2CO Observations Towards CH3OH Maser Sources
Okoh, Daniel1,2,3; Esimbek, Jarken1; Zhou, JianJun1; Tang, Xindi1; Chukwude, Augustine3; Urama, Johnson3; Okeke, Pius2
2013-03-21
Conference NameIAU Symposium 292: Molecular Gas, Dust, and Star Formation in Galaxies
Source PublicationMolecular Gas, Dust, and Star Formation, Proceedings of the International Astronomical Union, IAU Symposium 292
Volume292
Pages111-111
Conference Date20 - 24 August 2012
Correspondent Emailokodan2003@gmail.com
Conference PlaceBeijing, China
PublisherCambridge University Press
Contribution Rank1
Abstract

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.

Funding OrganizationIAU ; IAU
KeywordRadio Lines: Ism Ism: Molecules Stars: Formation
DOI10.1017/S1743921313000719
URL查看原文
Language英语
ISBN978-1-107-03381-8
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Document Type会议论文
Identifierhttp://ir.xao.ac.cn/handle/45760611-7/983
Collection射电天文研究室_恒星形成与演化研究团组
射电天文研究室
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Corresponding AuthorOkoh, Daniel
Affiliation1.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
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Corresponding Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Okoh, Daniel,Esimbek, Jarken,Zhou, JianJun,et al. H2CO Observations Towards CH3OH Maser Sources[C]:Cambridge University Press,2013:111-111.
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