Detection of Dark Matter Skewness in the VIRMOS-DESCART Survey: Implications for Ω0

@article{Pen2003DetectionOD,
  title={Detection of Dark Matter Skewness in the VIRMOS-DESCART Survey: Implications for $\Omega$0},
  author={Ue-li Pen and Tong-Jie Zhang and Ludovic van Waerbeke and Yannick Mellier and Pengjie Zhang and John Dubinski},
  journal={The Astrophysical Journal},
  year={2003},
  volume={592},
  pages={664-673}
}
Weak gravitational lensing provides a direct statistical measure of dark matter distribution. The variance is easiest to measure, which constrains the degenerate product σ8Ω. The degeneracy is broken by measuring the skewness arising from the fact that densities must remain positive, which is not possible when the initially symmetric perturbations become nonlinear. Skewness measures the nonlinear mass scale, which in combination with the variance measures Ω0 directly. We present the first… 

Figures from this paper

Optimal Weak-Lensing Skewness Measurements
Weak-lensing measurements are starting to provide statistical maps of the distribution of matter in the universe that are increasingly precise and complementary to cosmic microwave background maps.
Dealing with systematics in cosmic shear studies: New results from the VIRMOS-Descart survey
We present a reanalysis of the VIRMOS-Descart weak lensing data, with a particular focus on different corrections for the variation of the point spread function anisotropy (PSF) across the CCDs. We
The three-dimensional power spectrum of dark and luminous matter from the VIRMOS-DESCART cosmic shear survey
We present the first optimal power spectrum estimation and three-dimensional deprojections for the dark and luminous matter and their cross-correlations. The results are obtained using a new optimal
Dark Energy Constraints from the CTIO Lensing Survey
We perform a cosmological parameter analysis of the 75 deg2 CTIO lensing survey in conjunction with cosmic microwave background (CMB) and Type Ia supernovae data. For ΛCDM cosmologies, we find that
Weak lensing from space: first cosmological constraints from three-point shear statistics★
We use weak lensing data from the Hubble Space Telescope COSMOS survey to measure the second- and third-order moments of the cosmic shear field, estimated from about 450 000 galaxies with average
General Requirements on Matter Power Spectrum Predictions for Cosmology with Weak Lensing Tomography
Forthcoming projects such as DES, LSST, WFIRST, and Euclid aim to measure weak lensing shear correlations with unprecedented precision, constraining the dark energy equation of state at the percent
Sources of contamination to weak lensing three-point statistics: constraints from N-body simulations
We investigate the impact of the observed correlation between a galaxy's shape and its surrounding density field on the measurement of third-order weak lensing shear statistics. Using numerical
Breaking the degeneracy: Optimal use of three-point weak lensing statistics
Abstract We study the optimal use of three-point statistics in the analysis of weak lensing by large-scale structure. The three-point statistics have long been advocated as a powerful tool to break
Higher-order Statistics of Weak Lensing Shear and Flexion
Owing to their more extensive sky coverage and tighter control on systematic errors, future deep weak lensing surveys should provide a better statistical picture of the dark matter clustering beyond
Optimal survey design for skewness measurements in weak gravitational lensing
The properties and structure of the Universe we live in has been the subject of many studies since human kind started to watch the sky. Today, with rapid advancements in technology, cosmology has
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 27 REFERENCES
Cosmic Shear and Power Spectrum Normalization with the Hubble Space Telescope
Weak lensing by large-scale structure provides a direct measurement of matter fluctuations in the universe. We report a measurement of this "cosmic shear" based on 271 Wide Field Planetary Camera 2
Detection of non-Gaussian signatures in the VIRMOS-DESCART lensing survey
We have detected non-Gaussian signatures in the VIRMOS-DESCART weak lensing survey from a measurement of the three-point shear correlation function, following the method developed by Bernardeau et
Cosmic shear statistics and cosmology
We report a measurement of cosmic shear correlations using an eective area of 6.5 deg 2 of the VIRMOS deep imaging survey in progress at the Canada-France-Hawaii Telescope. We measured various shear
Weak-Lensing Results from the 75 Square Degree Cerro Tololo Inter-American Observatory Survey
We measure seeing-corrected ellipticities for 2 × 106 galaxies with magnitude R ≤ 23 in 12 widely separated fields totaling 75 deg2 of sky. At angular scales 30', ellipticity correlations are
Source-lens clustering effects on the skewness of the lensing convergence
ABSTRA C T The correlation between source galaxies and lensing potentials causes a systematic effect on measurements of cosmic shear statistics, known as the source ‐lens clustering (SLC) effect. The
Likelihood analysis of cosmic shear on simulated and VIRMOS-DESCART data
We present a maximum likelihood analysis of cosmological parameters from measurements of the aperture mass up to 35 arcmin using simulated and real cosmic shear data. A four-dimensional parameter
Weak Lensing Results from the 75 Square Degree CTIO Survey
We measure seeing-corrected ellipticities for 2 x 10^6 galaxies with magnitude R 30\arcmin, ellipticity correlations are detected at high significance and exhibit nearly the pure "E-mode" behavior
The three-point correlation function of cosmic shear: I. The natural components
Received ; accepted Abstract. The three-point correlation function of cosmic shear, the weak distortion of the images of distant galaxies by the gravitational field of the inhomogeneous matter
A Measurement of Weak Lensing by Large-Scale Structure in Red-Sequence Cluster Survey Fields
We have analyzed ~24 deg2 of RC-band imaging data from the Red-Sequence Cluster Survey (RCS) and measured the excess correlations between galaxy ellipticities on scales ranging from 1' to 30'. We
Gravity and Nongravity Modes in the VIRMOS-DESCART Weak-Lensing Survey*
We analyze the weak-lensing data of the VIRMOS imaging survey using projections (called E- and B-modes) of the two independent observable correlation functions. The E-mode contains all the lensing
...
1
2
3
...