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2007MNRAS.381..702B - Mon. Not. R. Astron. Soc., 381, 702-712 (2007/October-3)
Cosmological constraints from the 100-deg2 weak-lensing survey.
BENJAMIN J., HEYMANS C., SEMBOLONI E., VAN WAERBEKE L., HOEKSTRA H., ERBEN T., GLADDERS M.D., HETTERSCHEIDT M., MELLIER Y. and YEE H.K.C.
Abstract (from CDS):
The accuracy of our results is a marked improvement on previous work owing to three important differences in our analysis; we correctly account for sample variance errors by including a non-Gaussian contribution estimated from numerical simulations; we correct the measured shear for a calibration bias as estimated from simulated data; we model the redshift distribution, n(z), of each survey from the largest deep photometric redshift catalogue currently available from the CFHTLS-Deep. This catalogue is randomly sampled to reproduce the magnitude distribution of each survey with the resulting survey-dependent n(z) parametrized using two different models. While our results are consistent for the n(z) models tested, we find that our cosmological parameter constraints depend weakly (at the 5 per cent level) on the inclusion or exclusion of galaxies with low-confidence photometric redshift estimates (z > 1.5). These high-redshift galaxies are relatively few in number but contribute a significant weak-lensing signal. It will therefore be important for future weak-lensing surveys to obtain near-infrared data to reliably determine the number of high-redshift galaxies in cosmic shear analyses.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): gravitational lensing - cosmological parameters - cosmology: observations - large-scale structure of Universe
Simbad objects: 1
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