PMO OpenIR
Testing Shear Recovery with Field Distortion
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
2019-04-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume875Issue:1Pages:12
Corresponding AuthorZhang, Jun(betajzhang@sjtu.edu.cn)
AbstractThe 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.
Keywordgravitational lensing: weak large-scale structure of universe methods: data analysis
DOI10.3847/1538-4357/ab1080
WOS KeywordGALAXY SHAPE MEASUREMENT ; WEAK LENSING SURVEYS ; COSMIC SHEAR ; KIDS-450 ; CONSTRAINTS ; COSMOLOGY ; CFHTLENS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000464984900002
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24554
Collection中国科学院紫金山天文台
Corresponding AuthorZhang, Jun
Affiliation1.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
Recommended Citation
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Zhang, Jun]'s Articles
[Dong, Fuyu]'s Articles
[Li, Hekun]'s Articles
Baidu academic
Similar articles in Baidu academic
[Zhang, Jun]'s Articles
[Dong, Fuyu]'s Articles
[Li, Hekun]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Zhang, Jun]'s Articles
[Dong, Fuyu]'s Articles
[Li, Hekun]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.