CFHTLenS tomographic weak lensing cosmological parameter constraints: Mitigating the impact of intrinsic galaxy alignments

By Catherine Heymans, E. Grocutt, Alan Heavens, M. Kilbinger, Thomas D. Kitching, F. Simpson, J. Benjamin, T. Erben, H. Hildebrandt, H. Hoekstra and 14 more. 2013

550 citations recorded by the source corpus.

We present a finely-binned tomographic weak lensing analysis of the Canada-FranceHawaii 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 < < 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 BOSS, and a prior on the Hubble constant from the HST distance ladder. This leads to constraints on the normalisation of the matter power spectrum 8 = 0:799 0:015 and the matter density parameter m = 0:271 0:010 for a flat CDM 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 CDM 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.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/3623713f545bec070a7cd22f61be29de9bbfbf28

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

Citations in the corpus

The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: tomographic BAO analysis of DR12 combined sample in Fourier space (2016, methodology): “…fluctuations of the CMB photons, the SN Ia sample of JLA (Betoule et al. 2014), the galaxy power spectra from the WiggleZ survey (Blake et al. 2011) and the tomographic measurement of the weak lensing shear angular power spectra provided by the CFHTLenS team (Heymans et al. 2013).”
Interacting dark energy with time varying equation of state and the H0 tension (2018, methodology): “• Weak lensing (WL) data from the blue galaxy sample compiled from the Canada-France-Hawaii Telescope Lensing Survey [64, 65].”
An accurate halo model for fitting non-linear cosmological power spectra and baryonic feedback models (2015, methodology): “MacCrann et al.(2015) reanalysed the CFHTLenS survey but adding a single parameter that governs the amplitude of AGN feedback, which was taken to be given by the ratio of power from theAGN to DMONLY simulations.”
Constraint on neutrino masses from SDSS-III/BOSS Lyα forest and other cosmological probes (2014, methodology): “These studies include: the lensing power spectrum extracted from the Planck temperature map from 2013 [18]; the cluster abundance extracted from the Planck SZ catalogue [19]; the galaxy lensing power spectrum measured by the CFHTLens survey [20]; and, more recently, the redshift space distorsions me”
The first-year shear catalog of the Subaru Hyper Suprime-Cam Subaru Strategic Program Survey (2017, background): “…Rhodes et al. 2001; Hoekstra et al. 2002), ever larger datasets and increasingly sophisticated measurement techniques have led to steadily decreasing errors, both statistical and systematic (e.g., most recently, Heymans et al. 2013; Becker et al. 2016; Jee et al. 2016; Hildebrandt et al. 2017).”
KiDS-450: cosmological parameter constraints from tomographic weak gravitational lensing (2016, methodology): “The tension with the previously reported negative amplitude AIA = −1.18+0.96−1.17 from a joint analysis of CFHTLenS with WMAP7 (see Heymans et al. 2013) can be fully understood in terms of our improved knowledge of the true redshift distribution for low photometric redshift galaxies.”
Planck2015 results (2015, unknown): “…seem broadly consistent with Planck and it is only as CFHTLenS probes higher wavenumbers, particular in the 2D and tomographic correlation function analyses (Heymans et al. 2013; Kilbinger et al. 2013; Fu et al. 2014; MacCrann et al. 2015), that apparently strong discrepancies with Planck appear.”
MontePython 3: Boosted MCMC sampler and other features (2018, background): “1 SC [60] CFHTLens correlation full CFHTLens correlation Weak Lens.”
Lensing is Low: Cosmology, Galaxy Formation, or New Physics? (2016, background): “…independent constraints on the amplitude of low-redshift structure, both from lensing and from cluster abundances (e.g. Cacciato et al. 2009, 2013; Heymans et al. 2013; MacCrann et al. 2015; Giannantonio et al. 2016; Planck Collaboration XXIV 2016; Hildebrandt et al. 2017; Joudaki et al. 2017),…”
Gravitational lensing analysis of the Kilo-Degree Survey (2015, background): “MNRAS 454, 3500–3532 (2015) for example Heymans et al. 2013, and references therein) and a range of modified gravity scenarios (Simpson et al. 2013; Planck Collaboration XIV 2015b).”
KiDS-450 + 2dFLenS: Cosmological parameter constraints from weak gravitational lensing tomography and overlapping redshift-space galaxy clustering (2017, methodology): “…of our numerically estimated covariance matrix with the approach of Kaufman (1967) and Hartlap, Simon & Schneider (2007), previously used in e.g. Heymans et al. (2013) and Joudaki et al. (2017a), we avoid biasing our cosmological parameter constraints by employing the Sellentin & Heavens (2016)…”
Possible signals of vacuum dynamics in the Universe (2017, background): “Let us note that an account of the LSS observations does not only concern the f(z)σ8(z) data, but also the weak gravitational lensing constraints existing in the literature on the conventional quantity S8 ≡ σ8(Ωm/0.3)0.5 (Joudaki et al. 2018; Hildebrandt et al. 2017; Heymans et al. 2013).”
Quantifying baryon effects on the matter power spectrum and the weak lensing shear correlation (2018, methodology): “As a final result of this paper, we derive the expected baryon effect on the cosmic shear correlation and compare it to the measured shear correlation from the lensing survey CFHTLenS [60, 61].”