Planck Cold Clumps in the λ Orionis Complex. II. Environmental Effects on Core Formation
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; Juvela,Mika10; Kang,Sung-ju2; Kim,Gwanjeong2; M. Koch,Patrick9; Lee,Chang Won2,11; Li,Di12,13; Liu,H.-Y. B.22; Liu,Hong-Li14,15,16; Liu,Sheng-Yuan9; Rawlings,Mark G.17; Ristorcelli,I.18; Sanhueza,Patrico19; Soam,Archana2; Tatematsu,Ken’ichi19; Thompson,Mark20; Toth,L. V.21,26; Wang,Ke22; White,Glenn J.23,24; Wu,Yuefang25; Yang,Yao-Lun4,25
Source PublicationThe Astrophysical Journal Supplement Series
AbstractAbstract 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.
KeywordISM: clouds stars: formation submillimeter: ISM
WOS IDIOP:0067-0049-236-2-aac2e0
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.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
11.University of Science & Technology, 176 Gajeong-dong, Yuseong-gu, Daejeon, Republic of Korea
12.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, People’s Republic of China
13.University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, People’s Republic of China
14.Department of Physics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, People’s Republic of China
15.Departamento de Astronomía, Universidad de Concepción, Av. Esteban Iturra s/n, Distrito Universitario, 160-C, Chile
16.Chinese Academy of Sciences, South America Center for Astronomy, Camino El Observatorio 1515, Las Condes, Santiago, Chile
17.East Asian Observatory, 660 N. A’ohoku Place, Hilo, HI 96720, USA
18.IRAP, CNRS (UMR5277), Université Paul Sabatier, 9 avenue du Colonel Roche, BP 44346, F-31028, Toulouse Cedex 4, France
19.National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
20.Centre for Astrophysics Research, School of Physics Astronomy & Mathematics, University of Hertfordshire, College Lane, Hatfield, AL10 9AB, UK
21.E?tv?s Loránd University, Department of Astronomy, Pázmány Péter sétány 1/A, H-1117, Budapest, Hungary
22.European Southern Observatory, Karl-Schwarzschild-Str.2, D-85748 Garching bei München, Germany
23.Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
24.RAL Space, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, UK
25.Department of Astronomy, Peking University, 100871, Beijing, People’s Republic of China
26.Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, HAS, Konkoly-Thege M. ut 15-17, 1121 Budapest, Hungary
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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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