An Accurate Centroiding Algorithm for PSF Reconstruction
Lu,Tianhuan1; Luo,Wentao1; Zhang,Jun1; Zhang,Jiajun1; Li,Hekun1; Dong,Fuyu1; Li,Yingke1; Liu,Dezi2,3,4; Fu,Liping3; Li,Guoliang5; Fan,Zuhui2
Source PublicationThe Astronomical Journal
AbstractAbstract In this work, we present a novel centroiding method based on Fourier space Phase Fitting (FPF) for Point Spread Function (PSF) reconstruction. We generate two sets of simulations to test our method. The first set is generated by GalSim with an elliptical Moffat profile and strong anisotropy that shifts the center of the PSF. The second set of simulations is drawn from CFHT i band stellar imaging data. We find non-negligible anisotropy from CFHT stellar images, which leads to ~0.08 scatter in units of pixels using a polynomial fitting method (Vakili & Hogg). When we apply the FPF method to estimate the centroid in real space, the scatter reduces to ~0.04 in S/N?=?200 CFHT-like sample. In low signal-to-noise ratio (S/N; 50 and 100) CFHT-like samples, the background noise dominates the shifting of the centroid; therefore, the scatter estimated from different methods is similar. We compare polynomial fitting and FPF using GalSim simulation with optical anisotropy. We find that in all S/N (50, 100, and 200) samples, FPF performs better than polynomial fitting by a factor of ~3. In general, we suggest that in real observations there exists anisotropy that shifts the centroid, and thus, the FPF method provides a better way to accurately locate it.
Keywordmethods: observational techniques: image processing
WOS IDIOP:0004-6256-156-1-aac5f7
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China,
2.Department of Astronomy, School of Physics, Peking University, Beijing 100871, People’s Republic of China
3.The Shanghai Key Lab for Astrophysics, Shanghai Normal University, Shanghai 200234, People’s Republic of China
4.South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, People’s Republic of China
5.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210000, People’s Republic of China
Recommended Citation
GB/T 7714
Lu,Tianhuan,Luo,Wentao,Zhang,Jun,et al. An Accurate Centroiding Algorithm for PSF Reconstruction[J]. The Astronomical Journal,2018,156(1).
APA Lu,Tianhuan.,Luo,Wentao.,Zhang,Jun.,Zhang,Jiajun.,Li,Hekun.,...&Fan,Zuhui.(2018).An Accurate Centroiding Algorithm for PSF Reconstruction.The Astronomical Journal,156(1).
MLA Lu,Tianhuan,et al."An Accurate Centroiding Algorithm for PSF Reconstruction".The Astronomical Journal 156.1(2018).
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