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2011MNRAS.410..143S - Mon. Not. R. Astron. Soc., 410, 143-160 (2011/January-1)
Weak lensing from space: first cosmological constraints from three-point shear statistics.
SEMBOLONI E., SCHRABBACK T., VAN WAERBEKE L., VAFAEI S., HARTLAP J. and HILBERT S.
Abstract (from CDS):
We measure two- and three-point shear statistics using a tree-code, dividing the signal in E, B and mixed components. We present a detection of the third-order moment of the aperture mass statistic and verify that the measurement is robust against systematic errors caused by point spread function (PSF) residuals and by the intrinsic alignments between galaxies. The amplitude of the measured three-point cosmic shear signal is in very good agreement with the predictions for a 7-yr Wilkinson Microwave Anisotropy Probe (WMAP7) best-fitting model, whereas the amplitudes of potential systematics are consistent with zero.
We make use of three sets of large Lambda cold dark matter (ΛCDM) simulations to test the accuracy of the cosmological predictions and to estimate the influence of the cosmology-dependent covariance.
We perform a likelihood analysis using the measurement of <M3ap> (θ) and find that the Ωm-σ8 degeneracy direction is well fitted by the relation: σ8(Ωm/0.30)0.49= 0.78+0.11–0.26 which is in good agreement with the best-fitting relation obtained by using the measurement of <M2ap> (θ): σ8(Ωm/0.30)0.67= 0.70+0.11–0.14.
We present the first measurement of the more generalized three-point shear statistic <M3ap> (θ1, θ2, θ3) and find a very good agreement with the WMAP7 best-fitting cosmology. The cosmological interpretation of <M3ap> (θ1, θ2, θ3) gives σ8(Ωm/0.30)0.46= 0.69+0.08–0.14. Furthermore, the combined likelihood analysis of <M3ap> (θ1, θ2, θ3) and <M2ap> (θ) improves the accuracy of the cosmological constraints to σ8(Ωm/0.30)0.50= 0.69+0.07–0.12, showing the high potential of this combination of measurements to infer cosmological constraints.
Abstract Copyright: 2010 The Authors. Journal compilation2010 RAS
Journal keyword(s): gravitational lensing: weak - cosmological parameters - cosmology: observations - dark matter - large-scale structure of Universe
Simbad objects: 1
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