An Accurate Centroiding Algorithm for PSF Reconstruction

doi:10.3847/1538-3881/aac5f7

	An Accurate Centroiding Algorithm for PSF Reconstruction
	Lu,Tianhuan 1; Luo,Wentao 1; Zhang,Jun 1; Zhang,Jiajun 1; Li,Hekun 1; Dong,Fuyu 1; Li,Yingke 1; Liu,Dezi 2,3,4; Fu,Liping 3; Li,Guoliang5
刊名	The Astronomical Journal
	2018-06-18
卷号	156 期号:1
关键词	methods: observational techniques: image processing
ISSN号	0004-6256
DOI	10.3847/1538-3881/aac5f7
英文摘要	Abstract 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.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-6256-156-1-AAC5F7
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/21851]
专题	中国科学院紫金山天文台
作者单位	1.Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China njpipeorgan@sjtu.edu.cn, wentao.luo82@sjtu.edu.cn 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
推荐引用方式 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).