CFHTLenS tomographic weak lensing cosmological parameter constraints: Mitigating the impact of intrinsic galaxy alignments
C Heymans, E Grocutt, A Heavens… - Monthly Notices of …, 2013 - academic.oup.com
Monthly Notices of the Royal Astronomical Society, 2013•academic.oup.com
We present a finely binned tomographic weak lensing analysis of the Canada–France–
Hawaii Telescope Lensing Survey (CFHTLenS) mitigating contamination to the signal from
the presence of intrinsic galaxy alignments via the simultaneous fit of a cosmological model
and an intrinsic alignment model. CFHTLenS spans 154 square degrees in five optical
bands, with accurate shear and photometric redshifts for a galaxy sample with a median
redshift of zm= 0.70. We estimate the 21 sets of cosmic shear correlation functions …
Hawaii Telescope Lensing Survey (CFHTLenS) mitigating contamination to the signal from
the presence of intrinsic galaxy alignments via the simultaneous fit of a cosmological model
and an intrinsic alignment model. CFHTLenS spans 154 square degrees in five optical
bands, with accurate shear and photometric redshifts for a galaxy sample with a median
redshift of zm= 0.70. We estimate the 21 sets of cosmic shear correlation functions …
Abstract
We present a finely binned tomographic weak lensing analysis of the Canada–France–Hawaii Telescope Lensing Survey (CFHTLenS) mitigating contamination to the signal from the presence of intrinsic galaxy alignments via the simultaneous fit of a cosmological model and an intrinsic alignment model. CFHTLenS spans 154 square degrees in five optical bands, with accurate shear and photometric redshifts for a galaxy sample with a median redshift of zm = 0.70. We estimate the 21 sets of cosmic shear correlation functions associated with six redshift bins, each spanning the angular range of 1.5 < θ < 35 arcmin. We combine this CFHTLenS data with auxiliary cosmological probes: the cosmic microwave background with data from WMAP7, baryon acoustic oscillations with data from Baryon Oscillation Spectroscopic Survey and a prior on the Hubble constant from the Hubble Space Telescope distance ladder. This leads to constraints on the normalization of the matter power spectrum σ8 = 0.799 ± 0.015 and the matter density parameter Ωm = 0.271 ± 0.010 for a flat Λ cold dark matter (ΛCDM) cosmology. For a flat wCDM cosmology, we constrain the dark energy equation-of-state parameter w = −1.02 ± 0.09. We also provide constraints for curved ΛCDM and wCDM cosmologies. We find the intrinsic alignment contamination to be galaxy-type dependent with a significant intrinsic alignment signal found for early-type galaxies, in contrast to the late-type galaxy sample for which the intrinsic alignment signal is found to be consistent with zero.
Oxford University Press
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