PMO OpenIR
C2H N=1-0 and N2H+ J=1-0 observations of Planck Galactic cold clumps
Liu, X. -C.1,2; Wu, Y.1,2; Zhang, C.1,2,3; Liu, T.4; Yuan, J.5; Qin, S. -L.3; Ju, B. -G.6,7; Li, L. -X.2
2019-01-24
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN1432-0746
Volume622Pages:18
Corresponding AuthorLiu, X. -C.(1501110219@pku.edu.cn)
AbstractA survey of C2H N = 1-0 and N2H+ J = 1-0 toward Planck Galactic cold clumps (PGCCs) was performed using the Purple Mountain Observatory's 13.7 m telescope. C2H and N2H+ were chosen to study the chemical evolutionary states of PGCCs. Among 121 observed molecular cores associated with PGCCs, 71 and 58 are detected with C2H N = 1-0 and N2H+ J = 1-0, respectively. The detected lines of most sources can be fitted with a single component with compatible V-LSR and line widths, which confirms that these PGCC cores are very cold (with gas temperatures 9-21 K) and quiescent while still dominanted by turbulence. The ratio between the column densities of C2H and N2H+ (N(C2H)/N(N2H+)) is found to be a good tracer for the evolutionary states of PGCC cores. Gas-grain chemical model can reproduce the decreasing trend of N(C2H)/N(N2H+) as a function of time. The cores with the lowest abundances of N2H+ (X[N2H+] < 10(-10)) are the youngest, and have nearly constant abundances of C2H. In evolved cores with X[N2H+] similar to 10(-9), abundances of C2H drop quickly as the exhaustion of carbon atoms. Although these PGCC cores are in different evolutionary states, they are all quite young (<5 x 10(5) yr) with N(C2H) > N(N2H+). Mapping observations are carried out toward 20 PGCC cores. The PGCC cores in Cepheus have lower N(C2H)/N(N2H+) and larger line widths compared with those in Taurus. This implies that PGCC cores in Taurus are less chemically evolved than those in Cepheus.
KeywordISM: molecules ISM: abundances ISM: kinematics and dynamics stars: formation ISM: clouds
DOI10.1051/0004-6361/201834411
WOS KeywordMASSIVE STAR-FORMATION ; MOLECULAR CLOUDS ; LINE-PROFILES ; DENSE CORES ; CHEMISTRY ; EVOLUTION ; DEPLETION ; ABUNDANCE ; COLLAPSE ; MOTIONS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000456678500004
PublisherEDP SCIENCES S A
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/19224
Collection中国科学院紫金山天文台
Corresponding AuthorLiu, X. -C.
Affiliation1.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
3.Yunnan Univ, Dept Astron, Kunming 650091, Yunnan, Peoples R China
4.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea
5.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
6.Qinghai Stn, Purple Mt Observ, Delingha 817000, Peoples R China
7.Chinese Acad Sci, Key Lab Radio Astron, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Liu, X. -C.,Wu, Y.,Zhang, C.,et al. C2H N=1-0 and N2H+ J=1-0 observations of Planck Galactic cold clumps[J]. ASTRONOMY & ASTROPHYSICS,2019,622:18.
APA Liu, X. -C..,Wu, Y..,Zhang, C..,Liu, T..,Yuan, J..,...&Li, L. -X..(2019).C2H N=1-0 and N2H+ J=1-0 observations of Planck Galactic cold clumps.ASTRONOMY & ASTROPHYSICS,622,18.
MLA Liu, X. -C.,et al."C2H N=1-0 and N2H+ J=1-0 observations of Planck Galactic cold clumps".ASTRONOMY & ASTROPHYSICS 622(2019):18.
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