TY - JOUR

T1 - Measuring dark energy properties with 3D cosmic shear

AU - Heavens, A. F.

AU - Kitching, T. D.

AU - Taylor, A. N.

AU - Kitching, Thomas

PY - 2006/11/1

Y1 - 2006/11/1

N2 - We present parameter estimation forecasts for present and future 3D
cosmic shear surveys. We demonstrate in particular that, in conjunction
with results from cosmic microwave background (CMB) experiments, the
properties of dark energy can be estimated with very high precision with
large-scale, fully 3D weak-lensing surveys. In particular, a five-band,
10000-deg2 ground-based survey of galaxies to a median
redshift of zm = 0.7 could achieve 1σ marginal
statistical errors, in combination with the constraints expected from
the CMB Planck Surveyor, of Δw0 = 0.108 and
Δwa = 0.099. We parametrize the redshift evolution of w
by w(a) = w0 + wa(1 - a) where a is the
scalefactor. Such a survey is achievable with a wide-field camera on a
4-m class telescope. The error on the value of w at an intermediate
pivot redshift of z = 0.368 is constrained to Δw(z = 0.368) =
0.0175. We compare and combine the 3D weak-lensing constraints with the
cosmological and dark energy parameters measured from planned baryon
acoustic oscillation (BAO) and supernova Type Ia experiments, and find
that 3D weak lensing significantly improves the marginalized errors on
w0 and wa in combination, and provides constraints
on w(z) at a unique redshift through the lensing effect. A combination
of 3D weak-lensing, CMB and BAO experiments could achieve
Δw0 = 0.037 and Δwa = 0.099. We also
show how our results can be scaled to other telescopes and survey
designs. Fully 3D weak shear analysis avoids the loss of information
inherent in tomographic binning, and we also show that the sensitivity
to systematic errors in photometric redshift is much less. In
conjunction with the fact that the physics of lensing is very soundly
based, the analysis here demonstrates that deep, wide-angle 3D
weak-lensing surveys are extremely promising for measuring dark energy
properties.

AB - We present parameter estimation forecasts for present and future 3D
cosmic shear surveys. We demonstrate in particular that, in conjunction
with results from cosmic microwave background (CMB) experiments, the
properties of dark energy can be estimated with very high precision with
large-scale, fully 3D weak-lensing surveys. In particular, a five-band,
10000-deg2 ground-based survey of galaxies to a median
redshift of zm = 0.7 could achieve 1σ marginal
statistical errors, in combination with the constraints expected from
the CMB Planck Surveyor, of Δw0 = 0.108 and
Δwa = 0.099. We parametrize the redshift evolution of w
by w(a) = w0 + wa(1 - a) where a is the
scalefactor. Such a survey is achievable with a wide-field camera on a
4-m class telescope. The error on the value of w at an intermediate
pivot redshift of z = 0.368 is constrained to Δw(z = 0.368) =
0.0175. We compare and combine the 3D weak-lensing constraints with the
cosmological and dark energy parameters measured from planned baryon
acoustic oscillation (BAO) and supernova Type Ia experiments, and find
that 3D weak lensing significantly improves the marginalized errors on
w0 and wa in combination, and provides constraints
on w(z) at a unique redshift through the lensing effect. A combination
of 3D weak-lensing, CMB and BAO experiments could achieve
Δw0 = 0.037 and Δwa = 0.099. We also
show how our results can be scaled to other telescopes and survey
designs. Fully 3D weak shear analysis avoids the loss of information
inherent in tomographic binning, and we also show that the sensitivity
to systematic errors in photometric redshift is much less. In
conjunction with the fact that the physics of lensing is very soundly
based, the analysis here demonstrates that deep, wide-angle 3D
weak-lensing surveys are extremely promising for measuring dark energy
properties.

U2 - 10.1111/j.1365-2966.2006.11006.x

DO - 10.1111/j.1365-2966.2006.11006.x

M3 - Article

VL - 373

SP - 105

EP - 120

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

ER -