TY - JOUR

T1 - Cosmological constraints from COMBO-17 using 3D weak lensing

AU - Kitching, T. D.

AU - Heavens, A. F.

AU - Taylor, A. N.

AU - Brown, M. L.

AU - Meisenheimer, K.

AU - Wolf, C.

AU - Gray, M. E.

AU - Bacon, D. J.

AU - Kitching, Thomas

PY - 2007/4/1

Y1 - 2007/4/1

N2 - We present the first application of the 3D cosmic shear method developed
in Heavens, Kitching & Taylor and the geometric shear-ratio analysis
developed in Taylor et al., to the COMBO-17 data set. 3D cosmic shear
has been used to analyse galaxies with redshift estimates from two
random COMBO-17 fields covering 0.52 deg2 in total, providing
a conditional constraint in the (σ8,
Ωm) plane as well as a conditional constraint on the
equation of state of dark energy, parametrized by a constant w ≡
pde/ρdec2. The
(σ8, Ωm) plane analysis constrained
the relation between σ8 and Ωm to be
σ8(Ωm/0.3)0.57+/-0.19 =
1.06+0.17-0.16, in agreement with a 2D cosmic
shear analysis of COMBO-17. The 3D cosmic shear conditional constraint
on w using the two random fields is w =
-1.27+0.64-0.70. The geometric shear-ratio
analysis has been applied to the A901/2 field, which contains three
small galaxy clusters. Combining the analysis from the A901/2 field,
using the geometric shear-ratio analysis, and the two random fields,
using 3D cosmic shear, w is conditionally constrained to w =
-1.08+0.63-0.58. The errors presented in this
paper are shown to agree with Fisher matrix predictions made in Heavens,
Kitching & Taylor and Taylor et al. When these methods are applied
to large data sets, as expected soon from surveys such as Pan-STARRS and
VST-KIDS, the dark energy equation of state could be constrained to an
unprecedented degree of accuracy.

AB - We present the first application of the 3D cosmic shear method developed
in Heavens, Kitching & Taylor and the geometric shear-ratio analysis
developed in Taylor et al., to the COMBO-17 data set. 3D cosmic shear
has been used to analyse galaxies with redshift estimates from two
random COMBO-17 fields covering 0.52 deg2 in total, providing
a conditional constraint in the (σ8,
Ωm) plane as well as a conditional constraint on the
equation of state of dark energy, parametrized by a constant w ≡
pde/ρdec2. The
(σ8, Ωm) plane analysis constrained
the relation between σ8 and Ωm to be
σ8(Ωm/0.3)0.57+/-0.19 =
1.06+0.17-0.16, in agreement with a 2D cosmic
shear analysis of COMBO-17. The 3D cosmic shear conditional constraint
on w using the two random fields is w =
-1.27+0.64-0.70. The geometric shear-ratio
analysis has been applied to the A901/2 field, which contains three
small galaxy clusters. Combining the analysis from the A901/2 field,
using the geometric shear-ratio analysis, and the two random fields,
using 3D cosmic shear, w is conditionally constrained to w =
-1.08+0.63-0.58. The errors presented in this
paper are shown to agree with Fisher matrix predictions made in Heavens,
Kitching & Taylor and Taylor et al. When these methods are applied
to large data sets, as expected soon from surveys such as Pan-STARRS and
VST-KIDS, the dark energy equation of state could be constrained to an
unprecedented degree of accuracy.

U2 - 10.1111/j.1365-2966.2007.11473.x

DO - 10.1111/j.1365-2966.2007.11473.x

M3 - Article

VL - 376

SP - 771

EP - 778

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

ER -