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Large-scale Spectroscopic Mapping of the rho Ophiuchi Molecular Cloud Complex. I. The C2H-to-N2H+ Ratio as a Signpost of Cloud Characteristics
Pan, Zhichen1; Li, Di1,2,3; Chang, Qiang4; Qian, Lei1,2; Bergin, Edwin A.5; Wang, Junzhi6
2017-02-20
Source PublicationASTROPHYSICAL JOURNAL
Volume836Issue:2
AbstractWe present 2.5-square-degree C2H N = 1-0 and N2H+ J = 1-0 maps of the rho Ophiuchi molecular cloud complex. These are the first large-scale maps of the rho Ophiuchi molecular cloud complex with these two tracers. The C2H emission is spatially more extended than the N2H+ emission. One faint N2H+ clump, Oph-M, and one C2H ring, OphRingSW, are identified for the first time. The observed C2H-to-N2H+ abundance ratio ([C2H]/[N2H+]) varies between 5 and 110. We modeled the C2H andN(2)H(+) abundances with 1D chemical models, which show a clear decline of [C2H]/ [N2H+] with chemical age. Such an evolutionary trend is little affected by temperatures when they are below 40 K. At high density (n(H) > 10(5) cm(-3)), however, the time it takes for the abundance ratio to drop at least one order of magnitude becomes less than the dynamical time (e.g., turbulence crossing time of similar to 10(5) yr). The observed [C2H]/[N2H+] difference between L1688 and L1689 can be explained by L1688 having chemically younger gas in relatively less dense regions. The observed [C2H]/[N2H+] values are the results of time evolution, accelerated at higher densities. For the relatively low density regions in L1688 where only C2H emission was detected, the gas should be chemically younger.
SubtypeArticle
KeywordIsm: Individual Objects (Rho Ophiuchi Molecular Cloud Complex) Ism: Molecules Radio Lines: Ism Stars: Formation
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational Basic Research Program of China (973 program)(2012CB821800 ; National Basic Research Program of China (973 program)(2012CB821800 ; National Science Foundation of China(11373038) ; National Science Foundation of China(11373038) ; CAS International Partnership Program(114A11KYSB20160008) ; CAS International Partnership Program(114A11KYSB20160008) ; Guizhou Normal University ; Guizhou Normal University ; CAS ; CAS ; 2015CB857101) ; 2015CB857101) ; National Basic Research Program of China (973 program)(2012CB821800 ; National Basic Research Program of China (973 program)(2012CB821800 ; National Science Foundation of China(11373038) ; National Science Foundation of China(11373038) ; CAS International Partnership Program(114A11KYSB20160008) ; CAS International Partnership Program(114A11KYSB20160008) ; Guizhou Normal University ; Guizhou Normal University ; CAS ; CAS ; 2015CB857101) ; 2015CB857101)
DOI10.3847/1538-4357/aa5c33
WOS KeywordSTAR-FORMING REGIONS ; INITIAL CONDITIONS ; COLOGNE DATABASE ; MAIN CLOUD ; DARK CLOUD ; MILLIMETER ; CORE ; EMISSION ; LINE ; C2H
Indexed BySCI
Language英语
Funding OrganizationNational Basic Research Program of China (973 program)(2012CB821800 ; National Basic Research Program of China (973 program)(2012CB821800 ; National Science Foundation of China(11373038) ; National Science Foundation of China(11373038) ; CAS International Partnership Program(114A11KYSB20160008) ; CAS International Partnership Program(114A11KYSB20160008) ; Guizhou Normal University ; Guizhou Normal University ; CAS ; CAS ; 2015CB857101) ; 2015CB857101) ; National Basic Research Program of China (973 program)(2012CB821800 ; National Basic Research Program of China (973 program)(2012CB821800 ; National Science Foundation of China(11373038) ; National Science Foundation of China(11373038) ; CAS International Partnership Program(114A11KYSB20160008) ; CAS International Partnership Program(114A11KYSB20160008) ; Guizhou Normal University ; Guizhou Normal University ; CAS ; CAS ; 2015CB857101) ; 2015CB857101)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000395797900010
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8253
Collection射电天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Univ Chinese Acad Sci, 19 Yuquan Rd, Beijing, Peoples R China
4.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China
5.Univ Michigan, Dept Astron, 500 Church St, Ann Arbor, MI 48109 USA
6.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Pan, Zhichen,Li, Di,Chang, Qiang,et al. Large-scale Spectroscopic Mapping of the rho Ophiuchi Molecular Cloud Complex. I. The C2H-to-N2H+ Ratio as a Signpost of Cloud Characteristics[J]. ASTROPHYSICAL JOURNAL,2017,836(2).
APA Pan, Zhichen,Li, Di,Chang, Qiang,Qian, Lei,Bergin, Edwin A.,&Wang, Junzhi.(2017).Large-scale Spectroscopic Mapping of the rho Ophiuchi Molecular Cloud Complex. I. The C2H-to-N2H+ Ratio as a Signpost of Cloud Characteristics.ASTROPHYSICAL JOURNAL,836(2).
MLA Pan, Zhichen,et al."Large-scale Spectroscopic Mapping of the rho Ophiuchi Molecular Cloud Complex. I. The C2H-to-N2H+ Ratio as a Signpost of Cloud Characteristics".ASTROPHYSICAL JOURNAL 836.2(2017).
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