CH AS A MOLECULAR GAS TRACER AND C-SHOCK TRACER ACROSS A MOLECULAR CLOUD BOUNDARY IN TAURUS
文献类型：期刊论文
| 作者 | Xu, Duo1,2,4; Li, Di1,3 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2016-12-10 |
| 卷号 | 833期号:1页码:10 |
| ISSN号 | 0004-637X |
| 关键词 | evolution ISM: clouds ISM: individual objects (Taurus) ISM: molecules |
| DOI | 10.3847/1538-4357/833/1/90 |
| 通讯作者 | Xu, Duo(dxu@astro.umass.edu) |
| 英文摘要 | We present new observations of all three ground-state transitions of the methylidyne (CH) radical and all four ground-state transitions of the hydroxyl (OH) radical toward a sharp boundary region of the Taurus molecular cloud. These data were analyzed in conjunction with existing CO and dust images. The derived CH abundance is consistent with previous observations of translucent clouds (0.8 <= A(v) <= 2.1 mag). The X(CH)-factor is nearly a constant (1.0 +/- 0.06) x 10(22) cm(-2) K-1 km(-1) s in this extinction range, with less dispersion than that of the more widely used molecular tracers CO and OH. CH turns out be a better tracer of total column density in such an intermediate extinction range than CO or OH. Compared with previous observations, CH is overabundant below 1 mag extinction. Such an overabundance of CH is consistent with the presence of a C-shock. CH has two kinematic components, one of which shifts from 5.3 to 6 km s(-1), while the other stays at 6.8 km s(-1) when moving from outside toward inside of the cloud. These velocity behaviors exactly match previous OH observation. The shifting of the two kinematic components indicates colliding streams or gas flow at the boundary region, which could be the cause of the C-shock. |
| WOS关键词 | DIFFUSE CLOUDS ; INTERSTELLAR CLOUDS ; MAGNETOHYDRODYNAMIC SHOCKS ; RADIO OBSERVATIONS ; EMISSION ; ABUNDANCE ; OH ; EXTINCTION ; EXCITATION ; CHEMISTRY |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000390792000002 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/23368]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Xu, Duo |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Key Lab Radio Astron, Beijing, Peoples R China 4.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA |
| 推荐引用方式 GB/T 7714 | Xu, Duo,Li, Di. CH AS A MOLECULAR GAS TRACER AND C-SHOCK TRACER ACROSS A MOLECULAR CLOUD BOUNDARY IN TAURUS[J]. ASTROPHYSICAL JOURNAL,2016,833(1):10. |
| APA | Xu, Duo,&Li, Di.(2016).CH AS A MOLECULAR GAS TRACER AND C-SHOCK TRACER ACROSS A MOLECULAR CLOUD BOUNDARY IN TAURUS.ASTROPHYSICAL JOURNAL,833(1),10. |
| MLA | Xu, Duo,et al."CH AS A MOLECULAR GAS TRACER AND C-SHOCK TRACER ACROSS A MOLECULAR CLOUD BOUNDARY IN TAURUS".ASTROPHYSICAL JOURNAL 833.1(2016):10. |
入库方式： OAI收割
来源：紫金山天文台
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