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| The comparison of H2CO (1(10)-1(11)), (CO)-O-18 (1-0) and the continuum towards molecular clouds | |
Tang, Xin-Di1,2 ; Esimbek, Jarken1,3; Zhou, Jian-Jun1,3; Wu, Gang1,2,3; Okoh, Daniel1,4
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| 2014-08-01 | |
| Source Publication | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| Volume | 14Issue:8Pages:959-970 |
| Contribution Rank | 1 |
| Abstract | We present large scale observations of (CO)-O-18 (1-0) towards four massive star forming regions: MON R2, S156, DR17/L906 and M17/M18. The transitions of H2CO(1(10)-1(11)), (CO)-O-18 (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 H2CO absorption line is affected by strong background continuum emission. From a comparison of H2CO and (CO)-O-18 maps, we found that the extent of H2CO absorption is broader than that of (CO)-O-18 emission in the four regions. Except for the DR17 region, the maximum in H2CO absorption is located at the same position as the (CO)-O-18 peak. A good correlation between intensities and widths of H2CO absorption and (CO)-O-18 emission lines indicates that the H2CO absorption line can trace the dense, warm regions of a molecular cloud. We find that N(H2CO) is well correlated with N((CO)-O-18) in the four regions and that the average ratio of column densities is < N(H2CO)/N((CO)-O-18)> similar to 0.03. |
| Keyword | Ism: Clouds Molecules Stars: Formation |
| Subtype | Article |
| DOI | 10.1088/1674-4527/14/8/006 |
| WOS Headings | Science & Technology ; Physical Sciences |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | H-II REGIONS ; FORMALDEHYDE ABSORPTION ; REFLECTION NEBULAE ; INTERSTELLAR CLOUDS ; PHYSICAL-PROPERTIES ; OPEN CLUSTERS ; RADIO-SOURCES ; M17 ; CHEMISTRY ; (CO)-C-13 |
| WOS Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:000340698100006 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/610 |
| 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 其它 |
| Affiliation | 1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Peoples R China 4.Univ Nigeria, Dept Phys & Astron, Nsukka 410001, Nigeria |
| First Author Affilication | Xinjiang Astronomical Observatory, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Tang, Xin-Di,Esimbek, Jarken,Zhou, Jian-Jun,et al. The comparison of H2CO (1(10)-1(11)), (CO)-O-18 (1-0) and the continuum towards molecular clouds[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2014,14(8):959-970. |
| APA | Tang, Xin-Di,Esimbek, Jarken,Zhou, Jian-Jun,Wu, Gang,&Okoh, Daniel.(2014).The comparison of H2CO (1(10)-1(11)), (CO)-O-18 (1-0) and the continuum towards molecular clouds.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,14(8),959-970. |
| MLA | Tang, Xin-Di,et al."The comparison of H2CO (1(10)-1(11)), (CO)-O-18 (1-0) and the continuum towards molecular clouds".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 14.8(2014):959-970. |
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| The comparison of H2（998KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-ND | View Application Full Text | |
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