A Low-mass Cold and Quiescent Core Population in a Massive Star Protocluster
文献类型：期刊论文
| 作者 | Li,Shanghuo2,3,4,5; Lu,Xing6; Zhang,Qizhou4; Lee,Chang Won2,7; Sanhueza,Patricio6,8; Beuther,Henrik9; Jiménez-Serra,Izaskun,10; Qiu,Keping11; Palau,Aina12; Feng,Siyi1,13,14 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2021-04-29 |
| 卷号 | 912期号:1 |
| ISSN号 | 2041-8205 |
| 关键词 | Infrared dark clouds Early-type stars Star-forming regions Star formation Interstellar medium Interstellar line emission Protoclusters |
| DOI | 10.3847/2041-8213/abf64f |
| 英文摘要 | Abstract Pre-stellar cores represent the initial conditions of star formation. Although these initial conditions in nearby low-mass star-forming regions have been investigated in detail, such initial conditions remain vastly unexplored for massive star-forming regions. We report the detection of a cluster of low-mass starless and pre-stellar core candidates in a massive star protocluster-forming cloud, NGC 6334S. With the Atacama Large Millimeter/submillimeter Array (ALMA) observations at a ～0.02 pc spatial resolution, we identified 17 low-mass starless core candidates that do not show any evidence of protostellar activity. These candidates present small velocity dispersions, high fractional abundances of NH2D, high NH3 deuterium fractionations, and are completely dark in the infrared wavelengths from 3.6 up to 70 μm. Turbulence is significantly dissipated and the gas kinematics are dominated by thermal motions toward these candidates. Nine out of the 17 cores are gravitationally bound, and therefore are identified as pre-stellar core candidates. The embedded cores of NGC 6334S show a wide diversity in masses and evolutionary stages. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:2041-8205-912-1-ABF64F |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/56886]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Li,Shanghuo |
| 作者单位 | 1.Academia Sinica Institute of Astronomy and Astrophysics, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan 2.Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea; shanghuo.li@gmail.com 3.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China 4.Center for Astrophysics∣Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA 5.University of Chinese Academy of Sciences, 19A Yuquanlu, Beijing 100049, People’s Republic of China 6.National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 7.University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea 8.Department of Astronomical Science, SOKENDAI (The Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 9.Max Planck Institute for Astronomy, Konigstuhl 17, D-69117 Heidelberg, Germany 10.Centro de Astrobiología (CSIC-INTA), Ctra. de Torrejón a Ajalvir, Km. 4, Torrejón de Ardoz, E-28850 Madrid, Spain |
| 推荐引用方式 GB/T 7714 | Li,Shanghuo,Lu,Xing,Zhang,Qizhou,et al. A Low-mass Cold and Quiescent Core Population in a Massive Star Protocluster[J]. The Astrophysical Journal Letters,2021,912(1). |
| APA | Li,Shanghuo.,Lu,Xing.,Zhang,Qizhou.,Lee,Chang Won.,Sanhueza,Patricio.,...&Strom,Shaye.(2021).A Low-mass Cold and Quiescent Core Population in a Massive Star Protocluster.The Astrophysical Journal Letters,912(1). |
| MLA | Li,Shanghuo,et al."A Low-mass Cold and Quiescent Core Population in a Massive Star Protocluster".The Astrophysical Journal Letters 912.1(2021). |
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来源：国家天文台
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