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CH AS A MOLECULAR GAS TRACER AND C-SHOCK TRACER ACROSS A MOLECULAR CLOUD BOUNDARY IN TAURUS
Xu, Duo1,2,4; Li, Di1,3
2016-12-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume833Issue:1Pages:10
Corresponding AuthorXu, Duo(dxu@astro.umass.edu)
AbstractWe 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.
Keywordevolution ISM: clouds ISM: individual objects (Taurus) ISM: molecules
DOI10.3847/1538-4357/833/1/90
WOS KeywordDIFFUSE CLOUDS ; INTERSTELLAR CLOUDS ; MAGNETOHYDRODYNAMIC SHOCKS ; RADIO OBSERVATIONS ; EMISSION ; ABUNDANCE ; OH ; EXTINCTION ; EXCITATION ; CHEMISTRY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000390792000002
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23369
Collection中国科学院紫金山天文台
Corresponding AuthorXu, Duo
Affiliation1.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
Recommended Citation
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.
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