Submillimeter Continuum Variability in Planck Galactic Cold Clumps
文献类型：期刊论文
| 作者 | Park,Geumsook1; Kim,Kee-Tae1; Johnstone,Doug2,3; Kang,Sung-ju1; Liu,Tie1,4; Mairs,Steve4; Choi,Minho1; Lee,Jeong-Eun5; Sanhueza,Patricio6; Juvela,Mika7 |
| 刊名 | The Astrophysical Journal Supplement Series
 |
| 出版日期 | 2019-06-17 |
| 卷号 | 242期号:2 |
| 关键词 | stars: formation submillimeter: general submillimeter: ISM surveys |
| ISSN号 | 0067-0049 |
| DOI | 10.3847/1538-4365/ab1eae |
| 英文摘要 | Abstract In the early stages of star formation, a protostar is deeply embedded in an optically thick envelope such that it is not directly observable. Variations in the protostellar accretion rate, however, will cause luminosity changes that are reprocessed by the surrounding envelope and are observable at submillimeter wavelengths. We searched for submillimeter flux variability toward 12 Planck Galactic Cold Clumps detected by the James Clerk Maxwell Telescope (JCMT)-SCUBA-2 Continuum Observations of Pre-protostellar Evolution (SCOPE) survey. These observations were conducted at 850? using the JCMT/SCUBA-2. Each field was observed three times over about 14 months between 2016 April and 2017 June. We applied a relative flux calibration and achieved a calibration uncertainty of ～3.6% on average. We identified 136 clumps across 12 fields and detected four sources with flux variations of ～30%. For three of these sources, the variations appear to be primarily due to large-scale contamination, leaving one plausible candidate. The flux change of the candidate may be associated with low- or intermediate-mass star formation assuming a distance of 1.5?kpc, although we cannot completely rule out the possibility that it is a random deviation. Further studies with dedicated monitoring would provide a better understanding of the detailed relationship between submillimeter flux and accretion rate variabilities while enhancing the search for variability in star-forming clumps farther away than the Gould Belt. |
| 语种 | 英语 |
| WOS记录号 | IOP:0067-0049-242-2-AB1EAE |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/26556]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea; pgs@kasi.re.kr 2.NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Rd., Victoria, BC, V9E 2E7, Canada 3.Department of Physics and Astronomy, University of Victoria, Victoria, BC, V8P 5C2, Canada 4.East Asian Observatory, 660 North A’ohoku Pl., University Park, Hilo, Hawaii 96720, USA 5.School of Space Research, Kyung Hee University, 1732, Deogyeong-Daero, Giheung-gu Yongin-shi, Gyunggi-do 17104, Republic of Korea 6.National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 7.Department of Physics, P.O. Box 64, FI-00014, University of Helsinki, Finland 8.Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK 9.SOFIA Science Centre, USRA, NASA Ames Research Center, MS-12, N232, Moffett Field, CA 94035, USA 10.Institut UTINAM, CNRS UMR 6213, OSU THETA, Université Bourgogne Franche-Comté, France |
| 推荐引用方式 GB/T 7714 | Park,Geumsook,Kim,Kee-Tae,Johnstone,Doug,et al. Submillimeter Continuum Variability in Planck Galactic Cold Clumps[J]. The Astrophysical Journal Supplement Series,2019,242(2). |
| APA | Park,Geumsook.,Kim,Kee-Tae.,Johnstone,Doug.,Kang,Sung-ju.,Liu,Tie.,...&Yoo,Hyunju.(2019).Submillimeter Continuum Variability in Planck Galactic Cold Clumps.The Astrophysical Journal Supplement Series,242(2). |
| MLA | Park,Geumsook,et al."Submillimeter Continuum Variability in Planck Galactic Cold Clumps".The Astrophysical Journal Supplement Series 242.2(2019). |
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来源：国家天文台
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