Testing Shear Recovery with Field Distortion
文献类型：期刊论文
| 作者 | Zhang, Jun1,2; Dong, Fuyu1; Li, Hekun1; Li, Xiangchong3,4; Li, Yingke1; Liu, Dezi5,6,7; Luo, Wentao1; Fu, Liping6; Li, Guoliang8,9 ; Fan, Zuhui5,7
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2019-04-10 |
| 卷号 | 875期号:1页码:12 |
| ISSN号 | 0004-637X |
| 关键词 | gravitational lensing: weak large-scale structure of universe methods: data analysis |
| DOI | 10.3847/1538-4357/ab1080 |
| 通讯作者 | Zhang, Jun(betajzhang@sjtu.edu.cn) |
| 英文摘要 | The tilt, rotation, or offset of each CCD with respect to the focal plane, as well as the distortion of the focal plane itself, causes shape distortions in the observed objects, an effect typically known as field distortion (FD). We point out that FD provides a unique way of quantifying the accuracy of cosmic shear measurement. The idea is to stack the shear estimators from galaxies that share similar FD-induced shape distortions. Given that the latter can be calculated with parameters from astrometric calibrations, the accuracy of the shear estimator can be directly tested on real images. It provides a way to calibrate the multiplicative and additive shear recovery biases within the scientific data itself, without requiring simulations or any external data sets. We use the CFHTLenS images to test the Fourier_Quad shear recovery method. We highlight some details in our image-processing pipeline, including background removal, source identification and deblending, astrometric calibration, star selection for point-spread function reconstruction, noise reduction, etc. We show that in the shear ranges of -0.005 less than or similar to g(1) less than or similar to 0.005 and -0.008 less than or similar to g(2) less than or similar to 0.008, the multiplicative biases are at the level of less than or similar to 0.04. Slight additive biases on the order of similar to 5 x 10(-4) (6 sigma) are identified for sources provided by the official CFHTLenS catalog (not using its shear catalog), but are minor (4 sigma) for the source catalog generated by our Fourier_Quad pipeline. |
| WOS关键词 | GALAXY SHAPE MEASUREMENT ; WEAK LENSING SURVEYS ; COSMIC SHEAR ; KIDS-450 ; CONSTRAINTS ; COSMOLOGY ; CFHTLENS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000464984900002 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/24553]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Zhang, Jun |
| 作者单位 | 1.Shanghai Jiao Tong Univ, Dept Astron, Shanghai 200240, Peoples R China 2.Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China 3.Univ Tokyo, Dept Phys, Tokyo 1130033, Japan 4.Univ Tokyo, Kavli IPMU, UTIAS, Tokyo Inst Adv Study, Chiba 2778583, Japan 5.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China 6.Shanghai Normal Univ, Shanghai Key Lab Astrophys, Shanghai 200234, Peoples R China 7.Peking Univ, Dept Astron, Sch Phys, Beijing 100871, Peoples R China 8.Chinese Acad Sci, Purple Mt Observ, Nanjing 210000, Jiangsu, Peoples R China 9.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230029, Anhui, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Jun,Dong, Fuyu,Li, Hekun,et al. Testing Shear Recovery with Field Distortion[J]. ASTROPHYSICAL JOURNAL,2019,875(1):12. |
| APA | Zhang, Jun.,Dong, Fuyu.,Li, Hekun.,Li, Xiangchong.,Li, Yingke.,...&Fan, Zuhui.(2019).Testing Shear Recovery with Field Distortion.ASTROPHYSICAL JOURNAL,875(1),12. |
| MLA | Zhang, Jun,et al."Testing Shear Recovery with Field Distortion".ASTROPHYSICAL JOURNAL 875.1(2019):12. |
入库方式： OAI收割
来源：紫金山天文台
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