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| The JCMT Transient Survey: Data Reduction and Calibration Methods | |
Mairs, S.1,2; Lane, J.1; Johnstone, D.2; Kirk, H.2; Lacaille, K.3; Bower, G. C.4; Bell, G. S.5; Graves, S.5; Chapman, S.3; Yuri Aikawa6; Geoffrey Bower7; Joanna Bulger8; Vivien Chen9; Wen-Ping Chen10; Eun Jung Chung11; Jennifer Hatchell12; Yuxin He13 ; Gregory Herczeg14; Po-Chieh Huang10; Miju Kang11; Sung-ju Kang11; Jongsoo Kim11; Kyoung Hee Kim15; Mi-Ryang Kim16; ShinYoung Kim11,17; Yi-Jehng Kuan18; Woojin Kwon11,17; Shih-Ping Lai9; Bhavana Lalchand10; Jeong-Eun Lee19; Feng Long14; A-Ran Lyo11; Oscar Morata7; Harriet Parsons20; Andy Pon21; Ramprasad Rao7; Jonathan Rawlings22; Manash Samal10; Aleks Scholz23; Peter Scicluna7; Archana Soam11; Dimitris Stamatellos24; Wang Yiren25; Hyunju Yoo26; Miaomiao Zhang27; Jianjun Zhou13
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| 2017-07-01 | |
| Source Publication | Astrophysical Journal
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| ISSN | 0004-637X |
| Volume | 843Issue:1Pages:55 |
| Contribution Rank | 13 |
| Abstract | Though there has been a significant amount of work investigating the early stages of low-mass star formation in recent years, the evolution of the mass assembly rate onto the central protostar remains largely unconstrained. Examining in depth the variation in this rate is critical to understanding the physics of star formation. Instabilities in the outer and inner circumstellar disk can lead to episodic outbursts. Observing these brightness variations at infrared or submillimeter wavelengths constrains the current accretion models. The JCMT Transient Survey is a three-year project dedicated to studying the continuum variability of deeply embedded protostars in eight nearby star-forming regions at a one-month cadence. We use the SCUBA-2 instrument to simultaneously observe these regions at wavelengths of 450 and 850 mu m. In this paper, we present the data reduction techniques, image alignment procedures, and relative flux calibration methods for 850 mu m data. We compare the properties and locations of bright, compact emission sources fitted with Gaussians over time. Doing so, we achieve a spatial alignment of better than 1. between the repeated observations and an uncertainty of 2%-3% in the relative peak brightness of significant, localized emission. This combination of imaging performance is unprecedented in ground-based, single-dish submillimeter observations. Finally, we identify a few sources that show possible and confirmed brightness variations. These sources will be closely monitored and presented in further detail in additional studies throughout the duration of the survey. |
| Keyword | data analysis stars: formation submillimeter: ISM submillimeter: general techniques: image processing young stellar objects clerk maxwell telescope gould belt survey molecular clouds clump identification embedded protostars star-formation spitzer c2d scuba-2 continuum Astronomy & Astrophysics |
| Subtype | Article |
| DOI | 10.3847/1538-4357/aa7844 |
| URL | 查看原文 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000404605200019 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/3244 |
| Collection | 射电天文研究室_恒星形成与演化研究团组 |
| Affiliation | 1.Department of Physics and Astronomy, University of Victoria, Victoria, BC, V8P 1A1, Canada; 2.NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, BC, V9E 2E7, Canada; 3.Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, B3H 4R2, Canada; 4.Academia Sinica Institute of Astronomy and Astrophysics, 645 N. A‘ohōkū Place, Hilo, HI 96720, USA; 5.East Asian Observatory, 660 North A‘ohōkū Place, University Park, Hilo, Hawaii 96720, USA; 6.University of Tsukuba; 7.ASIAA; 8.Subaru Telescope; 9.National Tsing Hua University; 10.National Central University; 11.KASI; 12.University of Exeter; 13.Xinjiang Astronomical Observatory; 14.KIAA/Peking University; 15.KNU/KNUE; 16.Chungbuk University; 17.UST; 18.National Taiwan Normal University; 19.Kyung Hee University; 20.East Asian Observatory; 21.University of Western Ontario; 22.University College London; 23.St Andrews University; 24.University of Central Lancashire; 25.Peking University; 26.Chungnam National University; 27.Max Planck Institute for Astrophysics |
| Recommended Citation GB/T 7714 | Mairs, S.,Lane, J.,Johnstone, D.,et al. The JCMT Transient Survey: Data Reduction and Calibration Methods[J]. Astrophysical Journal,2017,843(1):55. |
| APA | Mairs, S..,Lane, J..,Johnstone, D..,Kirk, H..,Lacaille, K..,...&Jianjun Zhou.(2017).The JCMT Transient Survey: Data Reduction and Calibration Methods.Astrophysical Journal,843(1),55. |
| MLA | Mairs, S.,et al."The JCMT Transient Survey: Data Reduction and Calibration Methods".Astrophysical Journal 843.1(2017):55. |
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| File Name/Size | DocType | Version | Access | License | ||
| Mairs-2017-The JCMT （3586KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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