ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Detection of Extremely High-density Compact Structure of Prestellar Cores and Multiple Substructures Within
文献类型：期刊论文
| 作者 | Sahu,Dipen3; Liu,Sheng-Yuan3; Liu,Tie4; Evans II,Neal J.5; Hirano,Naomi3; Tatematsu,Ken’ichi6,29; Lee,Chin-Fei3; Kim,Kee-Tae7,8; Dutta,Somnath3; Alina,Dana9 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2021 |
| 卷号 | 907期号:1 |
| 关键词 | Molecular clouds Collapsing clouds Star-forming regions Star formation Protostars |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/abd3aa |
| 英文摘要 | Abstract Prestellar cores are self-gravitating dense and cold structures within molecular clouds where future stars are born. They are expected, at the stage of transitioning to the protostellar phase, to harbor centrally concentrated dense (sub)structures that will seed the formation of a new star or the binary/multiple stellar systems. Characterizing this critical stage of evolution is key to our understanding of star formation. In this work, we report the detection of high-density (sub)structures on the thousand-astronomical-unit (au) scale in a sample of dense prestellar cores. Through our recent ALMA observations toward the Orion Planck Galactic Cold Clumps, we have found five extremely dense prestellar cores, which have centrally concentrated regions of ～2000 au in size, and several 107 cm?3 in average density. Masses of these centrally dense regions are in the range of 0.30 to 6.89 M⊙. For the first time, our higher resolution observations (0.8″ ～ 320 au) further reveal that one of the cores shows clear signatures of fragmentation; such individual substructures/fragments have sizes of 800–1700 au, masses of 0.08 to 0.84 M⊙, densities of 2 ? 8 × 107 cm?3, and separations of ～1200 au. The substructures are massive enough (?0.1 M⊙) to form young stellar objects and are likely examples of the earliest stage of stellar embryos that can lead to widely (～1200 au) separated multiple systems. |
| 语种 | 英语 |
| WOS记录号 | IOP:2041-8205-907-1-ABD3AA |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/61020]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Sahu,Dipen |
| 作者单位 | 1.Department of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan R.O.C. 2.Department of Physics and Astronomy, University of Victoria, Victoria, BC, V8P 5C2, Canada 3.Academia Sinica Institute of Astronomy and Astrophysics, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan R.O.C.; dsahu@asiaa.sinica.edu.tw, syliu@asiaa.sinica.edu.tw 4.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China; liutie@shao.ac.cn 5.Department of Astronomy The University of Texas at Austin 2515 Speedway, Stop C1400 Austin, TX 78712-1205, USA 6.Nobeyama Radio Observatory, National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 462-2 Nobeyama, Minamimaki, Minamisaku, Nagano 384-1305, Japan 7.Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea 8.University of Science and Technology, Korea (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea 9.Department of Physics, School of Sciences and Humanities, Nazarbayev University, Nur-Sultan 010000, Kazakhstan 10.Departamento de Astronomía, Universidad de Chile, Camino el Observatorio 1515, Las Condes, Santiago, Chile |
| 推荐引用方式 GB/T 7714 | Sahu,Dipen,Liu,Sheng-Yuan,Liu,Tie,et al. ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Detection of Extremely High-density Compact Structure of Prestellar Cores and Multiple Substructures Within[J]. The Astrophysical Journal Letters,2021,907(1). |
| APA | Sahu,Dipen.,Liu,Sheng-Yuan.,Liu,Tie.,Evans II,Neal J..,Hirano,Naomi.,...&Zhou,Jianjun.(2021).ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Detection of Extremely High-density Compact Structure of Prestellar Cores and Multiple Substructures Within.The Astrophysical Journal Letters,907(1). |
| MLA | Sahu,Dipen,et al."ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Detection of Extremely High-density Compact Structure of Prestellar Cores and Multiple Substructures Within".The Astrophysical Journal Letters 907.1(2021). |
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