PMO OpenIR
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
2018-06-18
Source PublicationThe Astronomical Journal
ISSN0004-6256
Volume156Issue:1
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
DOI10.3847/1538-3881/aac5f7
Language英语
WOS IDIOP:0004-6256-156-1-aac5f7
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21852
Collection中国科学院紫金山天文台
Affiliation1.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
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).
Files in This Item:
File Name/Size DocType Version Access License
2018-IR-16.pdf(1192KB)期刊论文作者接受稿开放获取CC BY-NC-SAView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Lu,Tianhuan]'s Articles
[Luo,Wentao]'s Articles
[Zhang,Jun]'s Articles
Baidu academic
Similar articles in Baidu academic
[Lu,Tianhuan]'s Articles
[Luo,Wentao]'s Articles
[Zhang,Jun]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Lu,Tianhuan]'s Articles
[Luo,Wentao]'s Articles
[Zhang,Jun]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2018-IR-16.pdf
Format: Adobe PDF
This file does not support browsing at this time
All comments (0)
No comment.
 

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