PLANCK COLD CLUMPS IN THE lambda ORIONIS COMPLEX. I. DISCOVERY OF AN EXTREMELY YOUNG CLASS 0 PROTOSTELLAR OBJECT AND A PROTO-BROWN DWARF CANDIDATE IN THE BRIGHT-RIMMED CLUMP PGCC G192.32-11.88

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Liu , T , Zhang , Q , Kim , K-T , Wu , Y , Lee , C W , Lee , J-E , Tatematsu , K , Choi , M , Juvela , M , Thompson , M , Goldsmith , P F , Liu , S , Naomi , H , Koch , P , Henkel , C , Sanhueza , P , He , J , Rivera-Ingraham , A , Wang , K , Cunningham , M R , Tang , Y-W , Lai , S-P , Yuan , J , Li , D , Fuller , G , Kang , M , Luong , Q N , Liu , H B , Ristorcelli , I , Yang , J , Xu , Y , Hirota , T , Mardones , D , Qin , S-L , Chen , H-R , Kwon , W , Meng , F , Zhang , H , Kim , M-R & Yi , H-W 2016 , ' PLANCK COLD CLUMPS IN THE lambda ORIONIS COMPLEX. I. DISCOVERY OF AN EXTREMELY YOUNG CLASS 0 PROTOSTELLAR OBJECT AND A PROTO-BROWN DWARF CANDIDATE IN THE BRIGHT-RIMMED CLUMP PGCC G192.32-11.88 ' , Astrophysical Journal Supplement Series , vol. 222 , no. 1 , 7 . https://doi.org/10.3847/0067-0049/222/1/7

Title: PLANCK COLD CLUMPS IN THE lambda ORIONIS COMPLEX. I. DISCOVERY OF AN EXTREMELY YOUNG CLASS 0 PROTOSTELLAR OBJECT AND A PROTO-BROWN DWARF CANDIDATE IN THE BRIGHT-RIMMED CLUMP PGCC G192.32-11.88
Author: Liu, Tie; Zhang, Qizhou; Kim, Kee-Tae; Wu, Yuefang; Lee, Chang Won; Lee, Jeong-Eun; Tatematsu, Ken'ichi; Choi, Minho; Juvela, Mika; Thompson, Mark; Goldsmith, Paul F.; Liu, Sheng-yuan; Naomi, Hirano; Koch, Patrick; Henkel, Christian; Sanhueza, Patricio; He, JinHua; Rivera-Ingraham, Alana; Wang, Ke; Cunningham, Maria R.; Tang, Ya-Wen; Lai, Shih-Ping; Yuan, Jinghua; Li, Di; Fuller, Gary; Kang, Miju; Luong, Quang Nguyen; Liu, Hauyu Baobab; Ristorcelli, Isabelle; Yang, Ji; Xu, Ye; Hirota, Tomoya; Mardones, Diego; Qin, Sheng-Li; Chen, Huei-Ru; Kwon, Woojin; Meng, Fanyi; Zhang, Huawei; Kim, Mi-Ryang; Yi, Hee-Weon
Contributor: University of Helsinki, Department of Physics
Date: 2016-01
Language: eng
Number of pages: 28
Belongs to series: Astrophysical Journal Supplement Series
ISSN: 0067-0049
URI: http://hdl.handle.net/10138/183635
Abstract: We are performing a series of observations with ground-based telescopes toward Planck Galactic cold clumps (PGCCs) in the lambda Orionis complex in order to systematically investigate the effects of stellar feedback. In the particular case of PGCC G192.32-11.88, we discovered an extremely young Class 0 protostellar object (G192N) and a proto-brown dwarf candidate (G192S). G192N and G192S are located in a gravitationally bound brightrimmed clump. The velocity and temperature gradients seen in line emission of CO isotopologues indicate that PGCC G192.32-11.88 is externally heated and compressed. G192N probably has the lowest bolometric luminosity (similar to 0.8 L-circle dot) and accretion rate (6.3 x 10(-7) M-circle dot yr(-1)) when compared with other young Class 0 sources (e.g., PACS Bright Red Sources) in the Orion complex. It has slightly larger internal luminosity (0.21 +/- 0.01 L-circle dot) and outflow velocity (similar to 14 km s(-1)) than the predictions of first hydrostatic cores (FHSCs). G192N might be among the youngest Class 0 sources, which are slightly more evolved than an FHSC. Considering its low internal luminosity (0.08 +/- 0.01 L-circle dot) and accretion rate (2.8 x 10(-8) M-circle dot yr(-1)), G192S is an ideal proto-brown dwarf candidate. The star formation efficiency (similar to 0.3%-0.4%) and core formation efficiency (similar to 1%) in PGCC G192.32-11.88 are significantly smaller than in other giant molecular clouds or filaments, indicating that the star formation therein is greatly suppressed owing to stellar feedback.
Subject: ISM: jets and outflows
ISM: kinematics and dynamics
stars: formation
MASSIVE-STAR-FORMATION
SPECTRAL ENERGY-DISTRIBUTIONS
RADIATION-DRIVEN IMPLOSION
IRAS POINT SOURCES
H-II REGIONS
STELLAR OBJECTS
MOLECULAR CLOUDS
SUBMILLIMETER ARRAY
FORMING REGION
CORES
115 Astronomy, Space science
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