GREAT3 results - I. Systematic errors in shear estimation and the impact of real galaxy morphology
文献类型:期刊论文
作者 | Mandelbaum, Rachel1; Rowe, Barnaby2; Armstrong, Robert3; Bard, Deborah4,5; Bertin, Emmanuel6; Bosch, James3; Boutigny, Dominique5,7; Courbin, Frederic8; Dawson, William A.9; Donnarumma, Annamaria6 |
刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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出版日期 | 2015-07-01 |
卷号 | 450期号:3页码:2963-3007 |
关键词 | gravitational lensing: weak methods: data analysis techniques: image processing cosmology: observations |
英文摘要 | 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. |
WOS标题词 | Science & Technology ; Physical Sciences |
类目[WOS] | Astronomy & Astrophysics |
研究领域[WOS] | Astronomy & Astrophysics |
关键词[WOS] | WEAK LENSING ANALYSIS ; SPACE-TELESCOPE OBSERVATIONS ; IMAGE-ANALYSIS COMPETITION ; SPREAD FUNCTION CORRECTION ; ELLIPTIC-WEIGHTED HOLICS ; DIGITAL SKY SURVEY ; SHAPE MEASUREMENTS ; COSMIC SHEAR ; NOISE BIAS ; GRAVITATIONAL SHEAR |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000356339300054 |
公开日期 | 2015-08-18 |
源URL | [http://119.78.226.72/handle/331011/18353] ![]() |
专题 | 上海天文台_星系宇宙学重点实验室 |
作者单位 | 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 |
推荐引用方式 GB/T 7714 | Mandelbaum, Rachel,Rowe, Barnaby,Armstrong, Robert,et al. GREAT3 results - I. Systematic errors in shear estimation and the impact of real galaxy morphology[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,450(3):2963-3007. |
APA | Mandelbaum, Rachel.,Rowe, Barnaby.,Armstrong, Robert.,Bard, Deborah.,Bertin, Emmanuel.,...&Zuntz, Joe.(2015).GREAT3 results - I. Systematic errors in shear estimation and the impact of real galaxy morphology.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,450(3),2963-3007. |
MLA | Mandelbaum, Rachel,et al."GREAT3 results - I. Systematic errors in shear estimation and the impact of real galaxy morphology".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 450.3(2015):2963-3007. |
入库方式: OAI收割
来源:上海天文台
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