The comparison of H_2CO (1_(10)-1_(11)), C~(18)O (1-0) and the continuum towards molecular clouds

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	The comparison of H_2CO (1_(10)-1_(11)), C~(18)O (1-0) and the continuum towards molecular clouds
	Tang Xindi; Esimbek Jarken; Zhou Jianjun; Wu Gang; Okoh Daniel
	2014
Source Publication	Research in Astronomy and Astrophysics
ISSN	1674-4527
Volume	14 Issue:8 Pages:959-970
Abstract	We present large scale observations of C~(18)O (1-0) towards four massive star forming regions: MON R2, S156, DR17/L906 and M17/M18. The transitions of H_2CO (110-111), C~(18)O (1-0) and the 6 cm continuum are compared in these four regions. Our analysis of the observations and the results of the Non-LTE model shows that the brightness temperature of the formaldehyde absorption line is strongest in a background continuum temperature range of about 3-8 K. The excitation of the H_2CO absorption line is affected by strong background continuum emission. From a comparison of H_2CO and C~(18)O maps, we found that the extent of H_2CO absorption is broader than that of C~(18)O emission in the four regions. Except for the DR17 region, the maximum in H_2CO absorption is located at the same position as the C~(18)O peak. A good correlation between intensities and widths of H_2CO absorption and C~(18)O emission lines indicates that the H_2CO absorption line can trace the dense, warm regions of a molecular cloud.
Keyword	ISM: clouds molecules stars: formation
Indexed By	CSCD
Language	英语
CSCD ID	CSCD:5213707
Citation statistics
Document Type	期刊论文
Identifier	http://ir.xao.ac.cn/handle/45760611-7/6545
Collection	中国科学院新疆天文台
Affiliation	中国科学院新疆天文台
First Author Affilication	Xinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation GB/T 7714	Tang Xindi,Esimbek Jarken,Zhou Jianjun,et al. The comparison of H_2CO (1_(10)-1_(11)), C~(18)O (1-0) and the continuum towards molecular clouds[J]. Research in Astronomy and Astrophysics,2014,14(8):959-970.
APA	Tang Xindi,Esimbek Jarken,Zhou Jianjun,Wu Gang,&Okoh Daniel.(2014).The comparison of H_2CO (1_(10)-1_(11)), C~(18)O (1-0) and the continuum towards molecular clouds.Research in Astronomy and Astrophysics,14(8),959-970.
MLA	Tang Xindi,et al."The comparison of H_2CO (1_(10)-1_(11)), C~(18)O (1-0) and the continuum towards molecular clouds".Research in Astronomy and Astrophysics 14.8(2014):959-970.

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