The comparison of H_2CO (1_(10)-1_(11)), C~(18)O (1-0) and the continuum towards molecular clouds
文献类型：期刊论文
| 作者 | Tang Xindi ; Esimbek Jarken; Zhou Jianjun; Wu Gang; Okoh Daniel
|
| 刊名 | Research in Astronomy and Astrophysics
 |
| 出版日期 | 2014 |
| 卷号 | 14期号:8页码:959-970 |
| 关键词 | ISM: clouds molecules stars: formation |
| ISSN号 | 1674-4527 |
| 英文摘要 | 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. |
| 语种 | 英语 |
| CSCD记录号 | CSCD:5213707 |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/6544]  |
| 专题 | 研究单元未命名 |
| 作者单位 | 中国科学院新疆天文台 |
| 推荐引用方式 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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来源：新疆天文台
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