Chemical Properties of Two Dense Cores in a Planck Galactic Cold Clump G168.72-15.48
Tang, Mengyao1,2; Ge, J. X.3; Qin, Sheng-Li1,2; Liu, Tie4; Wu, Yuefang5; Kim, Kee-Tae6,7; Liu, Sheng-Yuan8; Zhang, Chao1,2,5; He, J. H.9,10,11; Ju, Bing-Gang12; Fang, Xinhe13
Corresponding AuthorTang, Mengyao(
AbstractTo deepen our understanding of the chemical properties of the Planck Galactic Cold Clump (PGCC) G168.72-15.48, we performed observations of nine molecular species, namely, c-C3H, H2CO, HC5N, HC7N, SO, CCH, N2H+, CH3OH, and CH3CCH, toward two dense cores in PGCC G168.72-15.48 using the Tianma Radio Telescope and Purple Mountain Observatory Telescope. We detected c-C3H, H2CO, HC5N, N2H+, CCH, and CH3OH in both G168-H1 and G168-H2 cores, whereas HC7N and CH3CCH were detected only in G168-H1 and SO was detected only in G168-H2. Mapping observations reveal that the CCH, N2H+, CH3OH, and CH3CCH emissions are well coupled with the dust emission in G168-H1. Additionally, N2H+ exhibits an exceptionally weak emission in the denser and more evolved G168-H2 core, which may be attributed to the N2H+ depletion. We suggest that the N2H+ depletion in G168-H2 is dominated by N-2 depletion, rather than the destruction by CO. The local thermodynamic equilibrium calculations indicate that the carbon-chain molecules of CCH, HC5N, HC7N, and CH3CCH are more abundant in the younger G168-H1 core. We found that starless core G168-H1 may have the properties of cold dark clouds based on its abundances of carbon-chain molecules. While, the prestellar core G168H2 exhibits lower carbon-chain molecular abundances than the general cold dark clouds. With our gas-grain astrochemical model calculations, we attribute the observed chemical differences between G168-H1 and G168-H2 to their different gas densities and different evolutionary stages.
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000506012000137
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Document Type期刊论文
Corresponding AuthorTang, Mengyao
Affiliation1.Yunnan Univ, Dept Astron, Kunming 650091, Yunnan, Peoples R China
2.Key Lab Astroparticle Phys Yunnan Prov, Kunming 650091, Yunnan, Peoples R China
3.Univ Chile, Dept Astron, Camino Observ 1515, Santiago, Chile
4.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
5.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
6.Korea Astron & Space Sci Inst, 776 Daedeokdaero, Daejeon 34055, South Korea
7.Univ Sci & Technol, 217 Gajeong Ro, Daejeon 34113, South Korea
8.Acad Sinica, Inst Astron & Astrophys, 11F Astron Math Bldg,AS NTU 1,Sect 4,Roosevelt Rd, Taipei 10617, Taiwan
9.Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, POB 110, Kunming 650011, Yunnan, Peoples R China
10.Chinese Acad Sci, South Amer Ctr Astrophys CASSACA, Camino Observ 1515, Santiago, Chile
11.Univ Chile, Dept Astron, Santiago, Chile
12.Purple Mt Observ, Qinghai Stn, Delingha 817000, Peoples R China
13.Zhengzhou Railway Vocat & Tech Coll, Dept Elect Engn, Zhengzhou 451460, Peoples R China
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GB/T 7714
Tang, Mengyao,Ge, J. X.,Qin, Sheng-Li,et al. Chemical Properties of Two Dense Cores in a Planck Galactic Cold Clump G168.72-15.48[J]. ASTROPHYSICAL JOURNAL,2019,887(2):15.
APA Tang, Mengyao.,Ge, J. X..,Qin, Sheng-Li.,Liu, Tie.,Wu, Yuefang.,...&Fang, Xinhe.(2019).Chemical Properties of Two Dense Cores in a Planck Galactic Cold Clump G168.72-15.48.ASTROPHYSICAL JOURNAL,887(2),15.
MLA Tang, Mengyao,et al."Chemical Properties of Two Dense Cores in a Planck Galactic Cold Clump G168.72-15.48".ASTROPHYSICAL JOURNAL 887.2(2019):15.
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