The dependence of intrinsic alignment of galaxies on wavelength using KiDS and GAMA

Abstract

The outer regions of galaxies are more susceptible to the tidal interactions that lead to intrinsic alignments of galaxies. The resulting alignment signal may therefore depend on the passband if the colours of galaxies vary spatially. To quantify this, we measured the shapes of galaxies with spectroscopic redshifts from the GAMA survey using deep gri imaging data from the KiloDegree Survey. The performance of the moment-based shape measurement algorithm DEIMOS was assessed using dedicated image simulations, which showed that the ellipticities could be determined with an accuracy better than 1% in all bands. Additional tests for potential systematic errors did not reveal any issues. We measure a significant difference of the alignment signal between the g,r and i-band observations. This difference exceeds the amplitude of the linear alignment model on scales below 2 Mpc/h. Separating the sample into central/satellite and red/blue galaxies, we find that that the difference is dominated by red satellite galaxies.

arXiv comment16 pages, 13 figures, accepted, to appear in A&A

References in corpus (61)

• Planck 2015 results. XIII. Cosmological parameters
• The Seventh Data Release of the Sloan Digital Sky Survey
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
• Detailed Structural Decomposition of Galaxy Images
• The Complete Light-curve Sample of Spectroscopically Confirmed Type Ia Supernovae from Pan-STARRS1 and Cosmological Constraints from The Combined Pantheon Sample
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• Weak Gravitational Lensing
• Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release
• KiDS-450: Cosmological parameter constraints from tomographic weak gravitational lensing
• A Method for Weak Lensing Observations
• Cosmological Tests of Modified Gravity
• Galaxy And Mass Assembly: Stellar Mass Estimates
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear
• CFHTLenS tomographic weak lensing cosmological parameter constraints: Mitigating the impact of intrinsic galaxy alignments
• Weak lensing mass reconstruction of the interacting cluster 1E0657-558: Direct evidence for the existence of dark matter
• Galaxy And Mass Assembly (GAMA): end of survey report and data release 2
• Cosmology with cosmic shear observations: a review
• Shapes and Shears, Stars and Smears: Optimal Measurements for Weak Lensing
• The Shear TEsting Programme 1: Weak lensing analysis of simulated ground-based observations
• Bayesian Galaxy Shape Measurement for Weak Lensing Surveys - III. Application to the Canada-France-Hawaii Telescope Lensing Survey
• Weak Gravitational Lensing and its Cosmological Applications
• Gravitational Lensing Analysis of the Kilo Degree Survey
• Shear calibration biases in weak lensing surveys
• Galaxy and Mass Assembly (GAMA): The GAMA Galaxy Group Catalogue (G3Cv1)
• Shapelets: I. A Method for Image Analysis
• Galaxy And Mass Assembly (GAMA): Structural Investigation of Galaxies via Model Analysis (SIGMA)
• The dark matter of gravitational lensing
• Structure of Disk Dominated Galaxies I. Bulge/Disk Parameters, Simulations, and Secular Evolution
• The first and second data releases of the Kilo-Degree Survey
• Intrinsic galaxy alignments from the 2SLAQ and SDSS surveys: luminosity and redshift scalings and implications for weak lensing surveys
• Galaxy alignments: An overview
• The Intrinsic Alignment of Galaxies and its Impact on Weak Gravitational Lensing in an Era of Precision Cosmology
• Detection of large scale intrinsic ellipticity-density correlation from the Sloan Digital Sky Survey and implications for weak lensing surveys
• Constraints on intrinsic alignment contamination of weak lensing surveys using the MegaZ-LRG sample
• The third data release of the Kilo-Degree Survey and associated data products
• Origins of weak lensing systematics, and requirements on future instrumentation (or knowledge of instrumentation)
• Intrinsic alignments of SDSS-III BOSS LOWZ sample galaxies
• Galaxy alignments: Observations and impact on cosmology
• Intrinsic Ellipticity Correlation of SDSS Luminous Red Galaxies and Misalignment with their Host Dark Matter Halos
• GREAT3 results I: systematic errors in shear estimation and the impact of real galaxy morphology
• The WiggleZ Dark Energy Survey: Direct constraints on blue galaxy intrinsic alignments at intermediate redshifts
• Galaxy alignments: Theory, modelling and simulations
• Intrinsic alignments of galaxies in the Horizon-AGN cosmological hydrodynamical simulation
• Means of confusion: how pixel noise affects shear estimates for weak gravitational lensing
• Color and stellar population gradients in galaxies. Correlation with mass
• The effect of imperfect corrections of PSF anisotropy on cosmic shear measurements
• The phenomenological approach to modeling the dark energy
• Precision simulation of ground-based lensing data using observations from space
• Intrinsic alignments of galaxies in the EAGLE and cosmo-OWLS simulations
• Intrinsic Alignments of Galaxies in the Illustris Simulation
• A study of the sensitivity of shape measurements to the input parameters of weak lensing image simulations
• Galaxy and Mass Assembly (GAMA): Projected Galaxy Clustering
• Multitracing Anisotropic Non-Gaussianity with Galaxy Shapes
• Intrinsic alignments of BOSS LOWZ galaxies II: Impact of shape measurement methods
• On the Probability Distributions of Ellipticity
• Weak gravitational lensing with DEIMOS
• Intrinsic alignments in redMaPPer clusters -- I. Central galaxy alignments and angular segregation of satellites
• Detection of the large scale alignment of massive galaxies at z~0.6
• Intrinsic alignment of redMaPPer clusters: cluster shape - matter density correlation
• Intrinsic Alignment in redMaPPer clusters -- II. Radial alignment of satellites toward cluster centers
• Measuring the scale dependence of intrinsic alignments using multiple shear estimates

Cited by in corpus (21)

• The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees
• The halo model as a versatile tool to predict intrinsic alignments
• KiDS+GAMA: Intrinsic alignment model constraints for current and future weak lensing cosmology
• An EFT description of galaxy intrinsic alignments
• KiDS-1000: Constraints on the intrinsic alignment of luminous red galaxies
• KiDS-Legacy: Consistency of cosmic shear measurements and joint cosmological constraints with external probes
• GAMA+KiDS: Alignment of galaxies in galaxy groups and its dependence on galaxy scale
• Modeling Intrinsic Galaxy Alignment in the MICE Simulation
• The impact of AGN feedback on galaxy intrinsic alignments in the Horizon simulations
• The PAU Survey: Intrinsic alignments and clustering of narrow-band photometric galaxies
• Accounting for object detection bias in weak gravitational lensing studies
• The impact of Self-Interacting Dark Matter on the Intrinsic Alignments of Galaxies
• Intrinsic galaxy alignments in the KiDS-1000 bright sample: dependence on colour, luminosity, morphology, and galaxy scale
• Halo shapes constrained from a pure sample of central galaxies in KiDS-1000
• UNIONS: a direct measurement of intrinsic alignment with BOSS/eBOSS spectroscopy
• A rising tide: Intrinsic alignments since the turn of the millennium
• Galaxy Alignments with Surrounding Structure in the Sloan Digital Sky Survey
• Redshift and stellar mass dependence of intrinsic shapes of disc-dominated galaxies from COSMOS observations below $z=1.0$
• Cosmological consequences of intrinsic alignments super-sample covariance
• Dusty Clump Survival in Supernova Ejecta: Dust-Mediated Growth vs. Crushing by the Reverse Shock
• Alignment of the central galaxies with the environment