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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
发表期刊ASTROPHYSICAL JOURNAL
卷号836期号:2
摘要We 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.
文章类型Article
关键词Ism: Individual Objects (Rho Ophiuchi Molecular Cloud Complex) Ism: Molecules Radio Lines: Ism Stars: Formation
WOS标题词Science & Technology ; Physical Sciences
资助者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) ; 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
关键词[WOS]STAR-FORMING REGIONS ; INITIAL CONDITIONS ; COLOGNE DATABASE ; MAIN CLOUD ; DARK CLOUD ; MILLIMETER ; CORE ; EMISSION ; LINE ; C2H
收录类别SCI
语种英语
资助者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) ; 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研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000395797900010
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8253
专题射电天文研究部
作者单位1.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
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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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