Dark energy constraints from weak-lensing cross-correlation cosmography

被引:113
作者
Bernstein, G [1 ]
Jain, B [1 ]
机构
[1] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
关键词
cosmological parameters; gravitational lensing;
D O I
10.1086/379768
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a method for implementing the idea of Jain & Taylor for constraining cosmological parameters with weak gravitational lensing. Photometric redshift information on foreground galaxies is used to produce templates of the mass structure at foreground slices z(l), and the predicted distortion field is cross-correlated with the measured shapes of sources at redshift z(s). The variation of the cross-correlation with z(s) depends purely on ratios of angular diameter distances. We propose a formalism for such an analysis that makes use of all foreground-background redshift pairs and derive the Fisher uncertainties on the dark energy parameters that would result from such a survey. Surveys from the proposed Supernova/Acceleration Probe ( SNAP) satellite or the Large Synoptic Survey Telescope (LSST) observatory could constrain the dark energy equation of state to sigma(w0) approximate to 0.01f(sky)(-1/2) and sigma(wa) approximate to0.035f(sky)(-1/2) after application of a practical prior on Omega(m). Advantages of this method over power-spectrum measurements are that it is unaffected by residual point-spread function distortions, is not limited by sample variance, and can use nonlinear mass structures to constrain the cosmology. The signal is, however, very small, amounting to a change of a few parts in 10(3) of the lensing distortion. In order to realize the full sensitivity to cosmological parameters, the calibration of lensing distortion must be independent of redshift to comparable levels, and photometric redshifts must be similarly free of bias. Both of these tasks require substantial advances over the present state of the art, but we discuss how such accurate calibrations might be achieved using internal consistency tests. Elimination of redshift bias would require the spectroscopic redshifts of similar to10(4)-10(5) high-redshift galaxies - fewer for lensing surveys less ambitious than SNAP or LSST.
引用
收藏
页码:17 / 25
页数:9
相关论文
共 37 条
  • [1] Neutrino mass and dark energy from weak lensing
    Abazajian, KN
    Dodelson, S
    [J]. PHYSICAL REVIEW LETTERS, 2003, 91 (04)
  • [2] Joint cosmic shear measurements with the Keck and William Herschel telescopes
    Bacon, DJ
    Massey, RJ
    Refregier, AR
    Ellis, RS
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2003, 344 (03) : 673 - 685
  • [3] Weak gravitational lensing
    Bartelmann, M
    Schneider, P
    [J]. PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 340 (4-5): : 291 - 472
  • [4] BENABED K, 2003, UNPUB PHYS REV D
  • [5] Shapes and shears, stars and smears: Optimal measurements for weak lensing
    Bernstein, GM
    Jarvis, M
    [J]. ASTRONOMICAL JOURNAL, 2002, 123 (02) : 583 - 618
  • [6] The shear power spectrum from the COMBO-17 survey
    Brown, ML
    Taylor, AN
    Bacon, DJ
    Gray, ME
    Dye, S
    Meisenheimer, K
    Wolf, C
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2003, 341 (01) : 100 - 118
  • [7] Gautret L, 2000, ASTRON ASTROPHYS, V353, P10
  • [8] Constraining the cosmological parameters using strong lensing
    Golse, G
    Kneib, JP
    Soucail, G
    [J]. ASTRONOMY & ASTROPHYSICS, 2002, 387 (03) : 788 - 803
  • [9] Cosmic shear statistics in the Suprime-Cam 2.1 square degree field:: Constraints on Ωm and σ8
    Hamana, T
    Miyazaki, S
    Shimasaku, K
    Furusawa, H
    Doi, M
    Hamabe, M
    Imi, K
    Kimura, M
    Komiyama, Y
    Nakata, F
    Okada, N
    Okamura, S
    Ouchi, M
    Sekiguchi, M
    Yagi, M
    Yasuda, N
    [J]. ASTROPHYSICAL JOURNAL, 2003, 597 (01) : 98 - 110
  • [10] 3D weak lensing
    Heavens, A
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2003, 343 (04) : 1327 - 1334