Planck Cold Clumps in the lambda Orionis Complex : II. Environmental Effects on Core Formation

Show full item record



Permalink

http://hdl.handle.net/10138/308375

Citation

JCMT Large Program SCOPE Collabora , TRAO Key Sci Program TOP Collabora , Yi , H-W , Lee , J-E , Liu , T , Kim , K-T , Choi , M , Eden , D , Evans , N J , Di Francesco , J , Fuller , G , Hirano , N , Juvela , M , Kang , S , Kim , G , Koch , P M , Lee , C W , Li , D , Liu , H-Y B , Liu , H-L , Liu , S-Y , Rawlings , M G , Ristorcelli , I , Sanhueza , P , Soam , A , Tatematsu , K , Thompson , M , Toth , L , Wang , K , White , G J , Wu , Y & Yang , Y-L 2018 , ' Planck Cold Clumps in the lambda Orionis Complex : II. Environmental Effects on Core Formation ' , Astrophysical Journal Supplement Series , vol. 236 , no. 2 , 51 . https://doi.org/10.3847/1538-4365/aac2e0

Title: Planck Cold Clumps in the lambda Orionis Complex : II. Environmental Effects on Core Formation
Author: JCMT Large Program SCOPE Collabora; TRAO Key Sci Program TOP Collabora; Yi, Hee-Weon; Lee, Jeong-Eun; Liu, Tie; Kim, Kee-Tae; Choi, Minho; Eden, David; Evans, Neal J.; Di Francesco, James; Fuller, Gary; Hirano, N.; Juvela, Mika; Kang, Sung-ju; Kim, Gwanjeong; Koch, Patrick M.; Lee, Chang Won; Li, Di; Liu, H-Y B.; Liu, Hong-Li; Liu, Sheng-Yuan; Rawlings, Mark G.; Ristorcelli, I.; Sanhueza, Patrico; Soam, Archana; Tatematsu, Ken'ichi; Thompson, Mark; Toth, L.; Wang, Ke; White, Glenn J.; Wu, Yuefang; Yang, Yao-Lun
Contributor: University of Helsinki, Department of Physics
Date: 2018-06
Language: eng
Number of pages: 23
Belongs to series: Astrophysical Journal Supplement Series
ISSN: 0067-0049
URI: http://hdl.handle.net/10138/308375
Abstract: Based on the 850 mu m dust continuum data from SCUBA-2 at James Clerk Maxwell Telescope (JCMT), we compare overall properties of Planck Galactic Cold Clumps (PGCCs) in the lambda 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 A 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 lambda Orionis cloud have higher dust temperatures (T-d = 16.13 +/- 0.15 K) and lower values of dust emissivity spectral index (beta = 1.65 +/- 0.02) than PGCCs in the Orion A (T-d = 13.79 +/- 0.21 K, beta = 2.07 +/- 0.03) and Orion B (T-d = 13.82 +/- 0.19 K, beta =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 lambda Orionis cloud, while 74 and 30 cores are found in the Orion A and B clouds, respectively. The cores in the lambda Orionis cloud show much lower mean values of size R = 0.08 pc, column density N(H-2) (9.5 +/- 1.2) x 10(22)cm(-2) , number density n(H-2) - (2.9 +/- 0.4) x 10 5 CM -3 , and mass M-core = 1.0 +/- 0.3 M(circle dot)compared to the cores in the Orion A [R = 0.11 pc, N(H-2) = (2.3 +/- 0.3) x 10(23) cm(-2), n(H-2) = (3.8 +/- 0.5) x 10(5)cm(-3) , and M-core = 2.4 +/- 0.3 M-circle dot] and Orion B [R = 0.16 pc, N(H-2) (3.8 +/- 0.4) x 10(23) cm(-2), n(H-2) = (15.6 +/- 1.8) x 10(5) cm(-3) , and M-core = 2.7 +/- 0.3 M-circle dot] clouds. These core properties in the A Orionis cloud can be attributed to the photodissociation and external heating by the nearby H rr 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.
Subject: ISM: clouds
stars: formation
submillimeter: ISM
YOUNG STELLAR OBJECTS
STAR-FORMATION
MOLECULAR CLOUDS
NEBULA-CLUSTER
DARK CLOUDS
POPULATION
EVOLUTION
DISTANCE
115 Astronomy, Space science
114 Physical sciences
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
Yi_2018_ApJS_236_51.pdf 3.703Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record