The JCMT Transient Survey: Data Reduction and Calibration Methods
文献类型：期刊论文
| 作者 | Mairs, S.4,5; Lane, J.4; Johnstone, D.5; Kirk, H.5; Lacaille, K.6; Bower, G. C.7; Bell, G. S.8; Graves, S.8; Chapman, S.6; Yuri Aikawa9 |
| 刊名 | Astrophysical Journal
 |
| 出版日期 | 2017-07-01 |
| 卷号 | 843期号:1页码:1655 |
| 关键词 | 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 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aa7844 |
| 产权排序 | 13 |
| 文献子类 | Article |
| 英文摘要 | 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. |
| URL标识 | 查看原文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000404605200019 |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/3244]  |
| 专题 | 恒星形成与演化研究团组 |
| 作者单位 | 1.KIAA/Peking University; 2.KNU/KNUE; 3.Xinjiang Astronomical Observatory; 4.Department of Physics and Astronomy, University of Victoria, Victoria, BC, V8P 1A1, Canada; 5.NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, BC, V9E 2E7, Canada; 6.Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS, B3H 4R2, Canada; 7.Academia Sinica Institute of Astronomy and Astrophysics, 645 N. A‘ohōkū Place, Hilo, HI 96720, USA; 8.East Asian Observatory, 660 North A‘ohōkū Place, University Park, Hilo, Hawaii 96720, USA; 9.University of Tsukuba; 10.ASIAA; |
| 推荐引用方式 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):1655. |
| 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),1655. |
| MLA | Mairs, S.,et al."The JCMT Transient Survey: Data Reduction and Calibration Methods".Astrophysical Journal 843.1(2017):1655. |
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