DENSE GAS IN MOLECULAR CORES ASSOCIATED WITH PLANCK GALACTIC COLD CLUMPS

	DENSE GAS IN MOLECULAR CORES ASSOCIATED WITH PLANCK GALACTIC COLD CLUMPS
	Yuan, Jinghua1 ; Wu, Yuefang 2; Liu, Tie 3; Zhang, Tianwei 4; Li, Jin Zeng1 ; Liu, Hong-Li1 ; Meng, Fanyi 5; Chen, Ping 2; Hu, Runjie 2; Wang, Ke 6
刊名	ASTROPHYSICAL JOURNAL
	2016-03-20
卷号	820 期号:1
关键词	ISM: abundances ISM: clouds ISM: kinematics and dynamics ISM: molecules stars: formation
英文摘要	We present the first survey of dense gas toward Planck Galactic Cold Clumps (PGCCs). Observations in the J = 1-0 transitions of HCO+ and HCN toward 621 molecular cores associated with PGCCs were performed using the Purple Mountain Observatory's 13.7 m telescope. Among them, 250 sources were detected, including 230 cores detected in HCO+. and 158 in HCN. Spectra of the J = 1-0 transitions from (CO)-C-12, (CO)-C-13, and (CO)-O-18 at the centers of the 250 cores were extracted from previous mapping observations to construct a multi-line data set. The significantly low detection rate of asymmetric double-peaked profiles, together with the good consistency among central velocities of CO, HCO+, and HCN spectra, suggests that the CO-selected Planck cores are more quiescent than classical star-forming regions. The small difference between line widths of (CO)-O-18. and HCN indicates that the inner regions of CO-selected Planck cores are no more turbulent than the exterior. The velocity-integrated intensities and abundances of HCO+ are positively correlated with those of HCN, suggesting that these two species are well coupled and chemically connected. The detected abundances of both HCO+ and HCN are significantly lower than values in other low- to high-mass star-forming regions. The low abundances may be due to beam dilution. On the basis of an inspection of the parameters given in the PGCC catalog, we suggest that there may be about 1000 PGCC objects that have a sufficient reservoir of dense gas to form stars.
收录类别	SCI
语种	英语
WOS记录号	WOS:000372787000037
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5347]
专题	国家天文台_应用天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China 2.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 3.Korea Astron & Space Sci Inst 776, Daedeokdae Ro, Daejeon 305348, South Korea 4.Peking Univ, Hlth Sci Ctr, Xueyuan Rd 38th, Beijing 100191, Peoples R China 5.Univ Cologne, Inst Phys, Zulpicher Str 77, D-50937 Cologne, Germany 6.European So Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
推荐引用方式 GB/T 7714	Yuan, Jinghua,Wu, Yuefang,Liu, Tie,et al. DENSE GAS IN MOLECULAR CORES ASSOCIATED WITH PLANCK GALACTIC COLD CLUMPS[J]. ASTROPHYSICAL JOURNAL,2016,820(1).
APA	Yuan, Jinghua.,Wu, Yuefang.,Liu, Tie.,Zhang, Tianwei.,Li, Jin Zeng.,...&Wang, Ke.(2016).DENSE GAS IN MOLECULAR CORES ASSOCIATED WITH PLANCK GALACTIC COLD CLUMPS.ASTROPHYSICAL JOURNAL,820(1).
MLA	Yuan, Jinghua,et al."DENSE GAS IN MOLECULAR CORES ASSOCIATED WITH PLANCK GALACTIC COLD CLUMPS".ASTROPHYSICAL JOURNAL 820.1(2016).