Weak gravitational lensing with COSMOS:: Galaxy selection and shape measurements

被引:344
作者
Leauthaud, Alexie
Massey, Richard
Kneib, Jean-Paul
Rhodes, Jason
Johnston, David E.
Capak, Peter
Heymans, Catherine
Ellis, Richard S.
Koekemoer, Anton M.
Le Fevre, Oliver
Mellier, Yannick
Refregier, Alexandre
Robin, Annie C.
Scoville, Nick
Tasca, Lidia
Taylor, James E.
Van Waerbeke, Ludovic
机构
[1] Lab Astrophys Marseille, F-13376 Marseille 12, France
[2] CALTECH, Pasadena, CA 91125 USA
[3] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[4] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[5] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[6] Univ Paris 06, CNRS, Inst Astrophys, UMR7095, F-75014 Paris, France
[7] Observ Paris, LERMA, F-75014 Paris, France
[8] CEA Saclay, Serv Astrophys, F-91191 Gif Sur Yvette, France
[9] Observ Besancon, F-25010 Besancon, France
[10] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada
基金
美国国家科学基金会;
关键词
cosmology : observations; gravitational lensing; large-scale structure of universe;
D O I
10.1086/516598
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
With a primary goal of conducting precision weak-lensing measurements from space, the COSMOS survey has imaged the largest contiguous area observed by Hubble Space Telescope to date, using the Advanced Camera for Surveys ( ACS). This is the first paper in a series in which we describe our strategy for addressing the various technical challenges in the production of weak-lensing measurements from COSMOS data. We first construct a source catalog from 575 ACS/WFC tiles ( 1.64 deg(2)) subsampled at a pixel scale of 0.03 ''. Defects and diffraction spikes are carefully removed, leaving a total of 1.2 x 10(6) objects to a limiting magnitude of F814W=26.5. This catalog is made publicly available. Multiwavelength follow-up observations of the COSMOS field provide photometric redshifts for 73% of the source galaxies in the lensing catalog. We analyze and discuss the COSMOS redshift distribution and show broad agreement with other surveys to z similar to 1. Our next step is to measure the shapes of galaxies and correct them for the distortion induced by the time-varying ACS point-spread function and for charge transfer efficiency ( CTE) effects. Simulated images are used to derive the shear susceptibility factors that are necessary in transforming shape measurements into unbiased shear estimators. For every galaxy we derive a shape measurement error and utilize this quantity to extract the intrinsic shape noise of the galaxy sample. Interestingly, our results indicate that intrinsic shape noise varies little with size, magnitude, or redshift. Representing a number density of 66 galaxies per arcmin(2), the final COSMOS weak-lensing catalog contains 3.9x10(5) galaxies with accurate shape measurements. The properties of the COSMOS weak-lensing catalog described throughout this paper will provide key input numbers for the preparation and design of next-generation wide field space missions.
引用
收藏
页码:219 / 238
页数:20
相关论文
共 62 条
[1]  
[Anonymous], P 2002 HST CAL WORKS
[2]   Weak gravitational flexion [J].
Bacon, DJ ;
Goldberg, DM ;
Rowe, BTP ;
Taylor, AN .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2006, 365 (02) :414-428
[3]   Evolution of the dark matter distribution with three-dimensional weak lensing [J].
Bacon, DJ ;
Taylor, AN ;
Brown, ML ;
Gray, ME ;
Wolf, C ;
Meisenheimer, K ;
Dye, S ;
Wisotzki, L ;
Borch, A ;
Kleinheinrich, M .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2005, 363 (03) :723-733
[4]   Numerical simulations of weak lensing measurements [J].
Bacon, DJ ;
Refregier, A ;
Clowe, D ;
Ellis, RS .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2001, 325 (03) :1065-1074
[5]   A CFH12k lensing survey of X-ray luminous galaxy clusters - I. Weak lensing methodology [J].
Bardeau, S ;
Kneib, JP ;
Czoske, O ;
Soucail, G ;
Smail, I ;
Ebeling, H ;
Smith, GP .
ASTRONOMY & ASTROPHYSICS, 2005, 434 (02) :433-448
[6]   Weak gravitational lensing [J].
Bartelmann, M ;
Schneider, P .
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 340 (4-5) :291-472
[7]   THE 3-DIMENSIONAL POWER SPECTRUM MEASURED FROM THE APM GALAXY SURVEY .1. USE OF THE ANGULAR-CORRELATION FUNCTION [J].
BAUGH, CM ;
EFSTATHIOU, G .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1993, 265 (01) :145-156
[8]   Dark energy constraints from weak-lensing cross-correlation cosmography [J].
Bernstein, G ;
Jain, B .
ASTROPHYSICAL JOURNAL, 2004, 600 (01) :17-25
[9]   Shapes and shears, stars and smears: Optimal measurements for weak lensing [J].
Bernstein, GM ;
Jarvis, M .
ASTRONOMICAL JOURNAL, 2002, 123 (02) :583-618
[10]  
BERTIN F, 1996, A AS, V117, P393