PROPERTIES AND GRAVITATIONAL COLLAPSE OF THE CORE IN G19.61-0.23
文献类型：期刊论文
| 作者 | Wu, Yuefang1; Qin, Sheng-Li2; Guan, Xin1; Xue, Rui2; Ren, Zhiyuan1 ; Liu, Tie1; Huang, Maohai2; Chen, Sheng2
|
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2009-06-01 |
| 卷号 | 697期号:2页码:L116-L121 |
| 关键词 | ISM: individual (G19.61-0.23) ISM: kinematics and dynamics ISM: molecules stars: formation stars: pre-main sequence |
| 英文摘要 | We present the results of an observational study toward the core in G19.61-0.23 with the Submillimeter Array. The continuum at 900 mu m revealed that the core has a mass of 15M(circle dot). The rotational temperature and the column density of CH(3)CN are 552 K and 3.4 x 10(16) cm(-2), respectively. No UC H II region or infrared source was found at the peak position of the core. Inverse P Cygni profiles were clearly exhibited in the (13)CO J = 3-2 and CN N = 3-2 lines, strongly indicating that material infall is taking place in this compact hot core. The mass-infall rate estimated from the (13)CO J = 3-2 line is 6.1 x 10(-3) M(circle dot) yr(-1), which agrees with the value calculated from a free-fall model. The mass-infall rate, together with the difference of the infall velocities estimated from the (13)CO J = 3-2 and CN J = 3-2 lines as well as the spatial distribution of their absorption show that the inflow motion originates from gravitational potential and is consistent with the inside-out model. The prior maser observations indicated outflow activities in this core. The signatures of both inflow and outflow activities suggest that there may be an embedded early high-mass star forming via gas accretion. After comparing the emissions of CO and its isotopes with the other widely used inflow motion tracers, we find that the CO lines may also be useful to trace inflow motion in a small scale when the continuum background is bright enough. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000266073800010 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7475]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Yuefang,Qin, Sheng-Li,Guan, Xin,et al. PROPERTIES AND GRAVITATIONAL COLLAPSE OF THE CORE IN G19.61-0.23[J]. ASTROPHYSICAL JOURNAL LETTERS,2009,697(2):L116-L121. |
| APA | Wu, Yuefang.,Qin, Sheng-Li.,Guan, Xin.,Xue, Rui.,Ren, Zhiyuan.,...&Chen, Sheng.(2009).PROPERTIES AND GRAVITATIONAL COLLAPSE OF THE CORE IN G19.61-0.23.ASTROPHYSICAL JOURNAL LETTERS,697(2),L116-L121. |
| MLA | Wu, Yuefang,et al."PROPERTIES AND GRAVITATIONAL COLLAPSE OF THE CORE IN G19.61-0.23".ASTROPHYSICAL JOURNAL LETTERS 697.2(2009):L116-L121. |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。