CFHTLenS: Weak lensing constraints on the ellipticity of galaxy-scale matter haloes and the galaxy-halo misalignment

Abstract

We present weak lensing constraints on the ellipticity of galaxy-scale matter haloes and the galaxy-halo misalignment. Using data from the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS), we measure the weighted-average ratio of the aligned projected ellipticity components of galaxy matter haloes and their embedded galaxies, $f_{\mathrm{h}}$, split by galaxy type. We then compare our observations to measurements taken from the Millennium Simulation, assuming different models of galaxy-halo misalignment. Using the Millennium Simulation we verify that the statistical estimator used removes contamination from cosmic shear. We also detect an additional signal in the simulation, which we interpret as the impact of intrinsic shape-shear alignments between the lenses and their large-scale structure environment. These alignments are likely to have caused some of the previous observational constraints on $f_{\mathrm{h}}$ to be biased high. From CFHTLenS we find $f_{\mathrm{h}}=-0.04\pm 0.25$ for early-type galaxies, which is consistent with current models for the galaxy-halo misalignment predicting $f_{\mathrm{h}}\simeq 0.20$. For late-type galaxies we measure $f_{\mathrm{h}}=0.69_{-0.36}^{+0.37}$ from CFHTLenS. This can be compared to the simulated results which yield $f_{\mathrm{h}}\simeq 0.02$ for misaligned late-type models.

21 pages, 3 tables, 9 figures. This replacement matches the version accepted for publication in MNRAS

References in corpus (38)

• The spin and shape of dark matter haloes in the Millennium simulation of a LambdaCDM universe
• Galaxies in the Hubble Ultra Deep Field: I. Detection, Multiband Photometry, Photometric Redshifts, and Morphology
• The Canadian Cluster Comparison Project: detailed study of systematics and updated weak lensing masses
• The Shear TEsting Programme 2: Factors affecting high precision weak lensing analyses
• Bayesian Galaxy Shape Measurement for Weak Lensing Surveys -I. Methodology and a Fast Fitting Algorithm
• Constraints on intrinsic alignment contamination of weak lensing surveys using the MegaZ-LRG sample
• Intrinsic alignments of SDSS-III BOSS LOWZ sample galaxies
• The spatial distribution of the Milky Way and Andromeda satellite galaxies
• Potential sources of contamination to weak lensing measurements: constraints from N-body simulations
• CARS: the CFHTLS-Archive-Research Survey; I. Five-band multi-colour data from 37 sq. deg. CFHTLS-Wide observations
• CFHTLenS: Cosmological constraints from a combination of cosmic shear two-point and three-point correlations
• The galaxy-halo connection from a joint lensing, clustering and abundance analysis in the CFHTLenS/VIPERS field
• The shapes, orientation, and alignment of Galactic dark matter subhalos
• The alignment and shape of dark matter, stellar, and hot gas distributions in the EAGLE and cosmo-OWLS simulations
• Means of confusion: how pixel noise affects shear estimates for weak gravitational lensing
• Bayesian Galaxy Shape Measurement for Weak Lensing Surveys -II. Application to Simulations
• The Masses and Shapes of Dark Matter Halos from Galaxy-Galaxy Lensing in the CFHTLS
• Galaxy Shapes and Intrinsic Alignments in The MassiveBlack-II Simulation
• Three Different Types of Galaxy Alignment within Dark Matter Halos
• A New Look at Massive Clusters: weak lensing constraints on the triaxial dark matter halos of Abell 1689, Abell 1835, & Abell 2204
• Constraints on the Alignment of Galaxies in Galaxy Clusters from $\sim$14,000 Spectroscopic Members
• Some like it triaxial: the universality of dark matter halo shapes and their evolution along the cosmic time
• Alignment between galaxies and large-scale structure
• Angular distribution of satellite galaxies from the Sloan Digital Sky Survey Data Release 4
• The Anisotropic Distribution of Satellite Galaxies
• Luminous Satellites of Early-Type Galaxies I: Spatial Distribution
• The Flattened Dark Matter Halo of M31 as Deduced from the Observed HI Scale Heights
• Lensing Measurements of the Ellipticity of LRG Dark Matter Halos
• The Distribution of Satellites Around Central Galaxies in a Cosmological Hydrodynamical Simulation
• Satellite Alignment: I. Distribution of Substructures and Their Dependence On Assembly History From N-Body Simulations
• CFHTLenS: A Weak Lensing Shear Analysis of the 3D-Matched-Filter Galaxy Clusters
• Internal Alignments of Red Versus Blue Discs in Dark Matter Halos
• Shapes of Stellar Systems and Dark Halos from Simulations of Galaxy Major Mergers
• Three-point galaxy-galaxy lensing as a probe of dark matter halo shapes
• The galaxy-galaxy lensing contribution to the cosmic shear two point function
• CFHTLenS: A Gaussian likelihood is a sufficient approximation for a cosmological analysis of third-order cosmic shear statistics
• Galaxy-galaxy(-galaxy) lensing as a sensitive probe of galaxy evolution
• Dark energy constraints and correlations with systematics from CFHTLS weak lensing, SNLS supernovae Ia and WMAP5

Cited by in corpus (24)

• Galaxy alignments: Theory, modelling and simulations
• Intrinsic Alignments of Galaxies in the Illustris Simulation
• On the shape of dark matter halos from MultiDark Planck simulations
• The ellipticity of galaxy cluster halos from satellite galaxies and weak lensing
• Halo ellipticity of GAMA galaxy groups from KiDS weak lensing
• The mass dependence of dark matter halo alignments with large-scale structure
• Euclid: Reconstruction of Weak Lensing mass maps for non-Gaussianity studies
• Light versus dark in strong-lens galaxies: Dark matter haloes that are rounder than their stars
• Multipolar moments of weak lensing signal around clusters. Weighing filaments in harmonic space
• Two families of elliptical plasma lenses
• Halo mass and weak galaxy-galaxy lensing profiles in rescaled cosmological $N$-body simulations
• Quantifying systematics from the shear inversion on weak-lensing peak counts
• Measuring the surface mass density ellipticity of redMaPPer galaxy clusters using weak-lensing
• KiDS-1000: Weak lensing and intrinsic alignment around luminous red galaxies
• Tightening weak lensing constraints on the ellipticity of galaxy-scale dark matter haloes
• Galaxy Ellipticity Measurements in the Near-Infrared for Weak Lensing
• Halo shapes constrained from a pure sample of central galaxies in KiDS-1000
• The shape of dark matter haloes: results from weak lensing in the Ultraviolet Near-Infrared Optical Northern Survey (UNIONS)
• Weak lensing analysis of galaxy pairs using CS82 data
• Fast multiscale galaxy cluster detection with weak lensing: towards a mass-selected sample
• On the problem of deformed spherical systems in Modified Newtonian Dynamics
• Probing the shape and internal structure of dark matter halos with the halo-shear-shear three-point correlation function
• Ellipticities of Galaxy Cluster Halos from Halo-Shear-Shear Correlations
• AMICO-WL: an optimal filtering algorithm for galaxy cluster detections with weak lensing