The molecular emissions and the infall motion in the high-mass young stellar object G8.68-0.37

	The molecular emissions and the infall motion in the high-mass young stellar object G8.68-0.37
	Ren, Zhiyuan1 ; Wu, Yuefang 1; Zhu, Ming 2; Liu, Tie 1; Peng, Ruisheng 3; Qin, Shengli 4; Li, Lixin 1,5
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2012-05-01
卷号	422 期号:2 页码:1098-1108
关键词	stars: formation stars: pre-main sequence ISM: individual object: G8.68-0.37 ISM: kinematics and dynamics ISM: molecules
英文摘要	We present a multi-wavelength observational study towards the high-mass young stellar object G8.68-0.37. A single massive gas-and-dust core is observed in the (sub) millimetre continuum and molecular line emissions. We fitted the spectral energy distribution (SED) from the dust continuum emission. The best-fitting SED suggests the presence of two components with temperature of T-d = 20 and 120 K, respectively. The core has a total mass of up to 1.5 x 10(3) M-circle dot and a bolometric luminosity of 2.3 x 10(4) L-circle dot. Both the mass and luminosity are dominated by the cold component (Td = 20 K). The molecular lines of (CO)-O-18, (CS)-S-34, DCN and thermally excited CH3OH are detected in this core. Prominent infall signatures are observed in the (CO)-C-12 (1 - 0) and (2 - 1). We estimated an infall velocity of 0.45 km s(-1) and a mass infall rate of 7 x 10(-4) M-circle dot yr(-1). From the molecular lines, we have found a high DCN-to-HCN abundance ratio of 0.07. The overabundant DCN may originate from a significant deuteration in the previous cold pre-protostellar phase. And the DCN should now be rapidly sublimated from the grain mantles to maintain the overabundance in the gas phase.
收录类别	SCI
语种	英语
WOS记录号	WOS:000303912800016
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6181]
专题	国家天文台_射电天文研究部
作者单位	1.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 2.Natl Astron Observ China, Beijing, Peoples R China 3.Caltech Submillimeter Observ, Hilo, HI 96720 USA 4.Univ Cologne, Inst Phys 1, D-50937 Cologne, Germany 5.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Ren, Zhiyuan,Wu, Yuefang,Zhu, Ming,et al. The molecular emissions and the infall motion in the high-mass young stellar object G8.68-0.37[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,422(2):1098-1108.
APA	Ren, Zhiyuan.,Wu, Yuefang.,Zhu, Ming.,Liu, Tie.,Peng, Ruisheng.,...&Li, Lixin.(2012).The molecular emissions and the infall motion in the high-mass young stellar object G8.68-0.37.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,422(2),1098-1108.
MLA	Ren, Zhiyuan,et al."The molecular emissions and the infall motion in the high-mass young stellar object G8.68-0.37".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 422.2(2012):1098-1108.