Large-scale Spectroscopic Mapping of the rho Ophiuchi Molecular Cloud Complex. I. The C2H-to-N2H+ Ratio as a Signpost of Cloud Characteristics
文献类型：期刊论文
| 作者 | Pan, Zhichen1; Li, Di1,2,3; Chang, Qiang4 ; Qian, Lei1,2; Bergin, Edwin A.5; Wang, Junzhi6
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2017-02-20 |
| 卷号 | 836期号:2页码:194 |
| 通讯作者邮箱 | panzc@nao.cas.cn ; dili@nao.cas.cn |
| 关键词 | ISM: individual objects (rho Ophiuchi molecular cloud complex) ISM: molecules radio lines: ISM stars: formation |
| ISSN号 | 0004-637X |
| 通讯作者 | Zhichen Pan |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 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 |
| WOS记录号 | WOS:000395797900010 |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/1432]  |
| 专题 | 天体化学研究团组 新疆天文台_110米口径全可动射电望远镜（SmART）_110米大口径全可动射电望远镜关键技术研究（973项目）_课题1：大样本射电天体的观测和前沿问题研究 |
| 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 |
| 推荐引用方式 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):194. |
| 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),194. |
| 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):194. |
入库方式： OAI收割
来源：新疆天文台
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