GREAT3 results - I. Systematic errors in shear estimation and the impact of real galaxy morphology

被引：124

作者：

Mandelbaum, Rachel ^{[1
]}

Rowe, Barnaby ^{[2
]}

Armstrong, Robert ^{[3
]}

Bard, Deborah ^{[4
,5
]}

Bertin, Emmanuel ^{[6
]}

Bosch, James ^{[3
]}

Boutigny, Dominique ^{[5
,7
]}

Courbin, Frederic ^{[8
]}

Dawson, William A. ^{[9
]}

Donnarumma, Annamaria ^{[6
]}

Conti, Ian Fenech ^{[10
]}

Gavazzi, Raphael ^{[6
]}

Gentile, Marc ^{[8
]}

Gill, Mandeep S. S. ^{[4
,5
]}

Hogg, David W. ^{[11
]}

Huff, Eric M. ^{[12
,13
]}

Jee, M. James ^{[14
]}

Kacprzak, Tomasz ^{[2
,15
]}

Kilbinger, Martin ^{[16
]}

Kuntzer, Thibault ^{[8
]}

Lang, Dustin ^{[1
]}

Luo, Wentao ^{[17
]}

March, Marisa C. ^{[18
]}

Marshall, Philip J. ^{[4
]}

Meyers, Joshua E. ^{[4
]}

Miller, Lance ^{[19
]}

Miyatake, Hironao ^{[3
,20
]}

Nakajima, Reiko ^{[21
]}

Ngole Mboula, Fred Maurice ^{[16
]}

Nurbaeva, Guldariya ^{[8
]}

Okura, Yuki ^{[22
]}

Paulin-Henriksson, Stephane ^{[16
]}

Rhodes, Jason ^{[23
,24
]}

Schneider, Michael D. ^{[9
]}

Shan, Huanyuan ^{[8
]}

Sheldon, Erin S. ^{[25
]}

Simet, Melanie ^{[1
]}

Starck, Jean-Luc ^{[16
]}

Sureau, Florent ^{[16
]}

Tewes, Malte ^{[21
]}

Adami, Kristian Zarb ^{[10
,19
]}

Zhang, Jun ^{[26
]}

Zuntz, Joe ^{[27
]}

机构：

[1] Carnegie Mellon Univ, Dept Phys, McWilliams Ctr Cosmol, Pittsburgh, PA 15213 USA

[2] UCL, Dept Phys & Astron, London WC1E 6BT, England

[3] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[4] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

[5] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[6] Univ Paris 06, Inst Astrophys Paris, UMR CNRS 7095, F-75014 Paris, France

[7] CNRS IN2P3, USR 6402, IN2P3, Ctr Calcul, F-69622 Villeurbanne, France

[8] Ecole Polytech Fed Lausanne, Astrophys Lab, Observ Sauverny, CH-1290 Versoix, Switzerland

[9] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[10] Univ Malta, ISSA, Msida 2080, Msd, Malta

[11] NYU, Dept Phys, Ctr Cosmol & Particle Phys, New York, NY 10003 USA

[12] Ohio State Univ, Ctr Cosmol & AstroParticle Phys CCAPP, Columbus, OH 43210 USA

[13] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[14] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[15] ETH, Inst Astron, CH-8093 Zurich, Switzerland

[16] CEA Saclay, Lab AIM, UMR CEA CNRS Paris 7, Irfu,SAp SEDI,Serv Astrophys, F-91191 Gif Sur Yvette, France

[17] Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China

[18] Univ Penn, David Rittenhouse Lab, Philadelphia, PA 19104 USA

[19] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[20] Univ Tokyo, Kavli Inst Phys & Math Universe, WPI, Kashiwa, Chiba 2778582, Japan

[21] Argelander Inst Astron, D-53121 Bonn, Germany

[22] Natl Astron Observ Japan, Tokyo 1818588, Japan

[23] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[24] CALTECH, Pasadena, CA 91125 USA

[25] Brookhaven Natl Lab, Upton, NY 11973 USA

[26] Shanghai Jiao Tong Univ, Dept Phys & Astron, Ctr Astron & Astrophys, Shanghai 200240, Peoples R China

[27] Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 450卷 / 03期

基金：

瑞士国家科学基金会; 美国国家科学基金会; 欧洲研究理事会; 日本学术振兴会;

关键词：

gravitational lensing: weak; methods: data analysis; techniques: image processing; cosmology: observations; IMAGE-ANALYSIS COMPETITION; ELLIPTIC-WEIGHTED HOLICS; WEAK LENSING ANALYSIS; DIGITAL SKY SURVEY; SHAPE MEASUREMENT; NOISE BIAS; COSMIC SHEAR; CALIBRATION; CHALLENGE; CONSTRAINTS;

D O I：

10.1093/mnras/stv781

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present first results from the third GRavitational lEnsing Accuracy Testing (GREAT3) challenge, the third in a sequence of challenges for testing methods of inferring weak gravitational lensing shear distortions from simulated galaxy images. GREAT3 was divided into experiments to test three specific questions, and included simulated space- and ground-based data with constant or cosmologically varying shear fields. The simplest (control) experiment included parametric galaxies with a realistic distribution of signal-to-noise, size, and ellipticity, and a complex point spread function (PSF). The other experiments tested the additional impact of realistic galaxy morphology, multiple exposure imaging, and the uncertainty about a spatially varying PSF; the last two questions will be explored in Paper II. The 24 participating teams competed to estimate lensing shears to within systematic error tolerances for upcoming Stage-IV dark energy surveys, making 1525 submissions overall. GREAT3 saw considerable variety and innovation in the types of methods applied. Several teams now meet or exceed the targets in many of the tests conducted (to within the statistical errors). We conclude that the presence of realistic galaxy morphology in simulations changes shear calibration biases by similar to 1 per cent for a wide range of methods. Other effects such as truncation biases due to finite galaxy postage stamps, and the impact of galaxy type as measured by the S,rsic index, are quantified for the first time. Our results generalize previous studies regarding sensitivities to galaxy size and signal-to-noise, and to PSF properties such as seeing and defocus. Almost all methods' results support the simple model in which additive shear biases depend linearly on PSF ellipticity.

引用

页码：2963 / 3007

页数：45

共 84 条

[1] Neutrino mass and dark energy from weak lensing [J].