Planck Cold Clumps in the λ Orionis Complex. II. Environmental Effects on Core Formation
文献类型：期刊论文
| 作者 | Yi,Hee-Weon1; Lee,Jeong-Eun1; Liu,Tie2,17; Kim,Kee-Tae2; Choi,Minho2; Eden,David3; II,Neal J. Evans2,4,5; Francesco,James Di6,7; Fuller,Gary8; Hirano,N.9 |
| 刊名 | The Astrophysical Journal Supplement Series
 |
| 出版日期 | 2018-06-20 |
| 卷号 | 236期号:2 |
| ISSN号 | 0067-0049 |
| 关键词 | ISM: clouds stars: formation submillimeter: ISM |
| DOI | 10.3847/1538-4365/aac2e0 |
| 英文摘要 | Abstract Based on the 850 μm dust continuum data from SCUBA-2 at James Clerk Maxwell Telescope (JCMT), we compare overall properties of Planck Galactic Cold Clumps (PGCCs) in the λ Orionis cloud to those of PGCCs in the Orion A and B clouds. The Orion A and B clouds are well-known active star-forming regions, while the λ Orionis cloud has a different environment as a consequence of the interaction with a prominent OB association and a giant H II region. PGCCs in the λ Orionis cloud have higher dust temperatures (Td?=?16.13?±?0.15 K) and lower values of dust emissivity spectral index (β?=?1.65?±?0.02) than PGCCs in the Orion A (Td?=?13.79?±?0.21 K, β?=?2.07?±?0.03) and Orion B (Td?=?13.82?±?0.19 K, β?=?1.96?±?0.02) clouds. We find 119 substructures within the 40 detected PGCCs and identify them as cores. Out of a total of 119 cores, 15 cores are discovered in the λ Orionis cloud, while 74 and 30 cores are found in the Orion A and B clouds, respectively. The cores in the λ Orionis cloud show much lower mean values of size R?=?0.08 pc, column density N(H2)?=?(9.5?±?1.2)?×?1022 cm?2, number density n(H2)?= (2.9?±?0.4)?×?105 cm?3, and mass Mcore?=?1.0?±?0.3 M⊙ compared to the cores in the Orion A [R?=?0.11 pc, N(H2)?=?(2.3?±?0.3)?×?1023 cm?2, n(H2)?=?(3.8?±?0.5)?×?105 cm?3, and Mcore?=?2.4?±?0.3 M⊙] and Orion B [R?=?0.16 pc, N(H2)?=?(3.8?±?0.4)?×?1023 cm?2, n(H2)?=?(15.6?±?1.8)?×?105 cm?3, and Mcore?=?2.7?±?0.3 M⊙] clouds. These core properties in the λ Orionis cloud can be attributed to the photodissociation and external heating by the nearby H II region, which may prevent the PGCCs from forming gravitationally bound structures and eventually disperse them. These results support the idea of negative stellar feedback on core formation. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0067-0049-236-2-AAC2E0 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/35541]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.School of Space Research, Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 17104, Republic of Korea 2.Korea Astronomy and Space Science Institute 776, Daedeokdae-ro, Yuseong-gu, Daejeon, Republic of Korea 3.Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK 4.Department of Astronomy, The University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USA 5.Humanitas College, Global Campus, Kyung Hee University, Yongin-shi 17104, Republic of Korea 6.NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada 7.Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P 1A1, Canada 8.UK ALMA Regional Centre Node, Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, UK 9.Institute of Astronomy and Astrophysics, Academia Sinica. 11F of Astronomy-Mathematics Building, AS/NTU No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C 10.Department of Physics, P.O.Box 64, FI-00014, University of Helsinki, Finland |
| 推荐引用方式 GB/T 7714 | Yi,Hee-Weon,Lee,Jeong-Eun,Liu,Tie,et al. Planck Cold Clumps in the λ Orionis Complex. II. Environmental Effects on Core Formation[J]. The Astrophysical Journal Supplement Series,2018,236(2). |
| APA | Yi,Hee-Weon.,Lee,Jeong-Eun.,Liu,Tie.,Kim,Kee-Tae.,Choi,Minho.,...&Yang,Yao-Lun.(2018).Planck Cold Clumps in the λ Orionis Complex. II. Environmental Effects on Core Formation.The Astrophysical Journal Supplement Series,236(2). |
| MLA | Yi,Hee-Weon,et al."Planck Cold Clumps in the λ Orionis Complex. II. Environmental Effects on Core Formation".The Astrophysical Journal Supplement Series 236.2(2018). |
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