KiDS-1000: Constraints on the intrinsic alignment of luminous red galaxies

Abstract

We constrain the luminosity and redshift dependence of the intrinsic alignment (IA) of a nearly volume-limited sample of luminous red galaxies selected from the fourth public data release of the Kilo-Degree Survey (KiDS-1000). To measure the shapes of the galaxies, we used two complementary algorithms, finding consistent IA measurements for the overlapping galaxy sample. The global significance of IA detection across our two independent luminous red galaxy samples, with our favoured method of shape estimation, is $\sim 10.7\sigma$. We find no significant dependence with redshift of the IA signal in the range $0.2<z<0.8$, nor a dependence with luminosity below $L_r\lesssim 2.9\times 10^{10}{h}^{-2}{L}_{r,\odot }$. Above this luminosity, however, we find that the IA signal increases as a power law, although our results are also compatible with linear growth within the current uncertainties. This behaviour motivates the use of a broken power law model when accounting for the luminosity dependence of IA contamination in cosmic shear studies.

21 pages, 14 figures. Accepted for publication in A&A

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• Constraints on anisotropic primordial non-Gaussianity from intrinsic alignments of SDSS-III BOSS galaxies
• Modeling Intrinsic Galaxy Alignment in the MICE Simulation
• Clustering of red-sequence galaxies in the fourth data release ofthe Kilo-Degree Survey
• Analysis method for 3D power spectrum of projected tensor field with fast estimator and window convolution modelling: an application to intrinsic alignments
• Accuracy requirements on intrinsic alignments for Stage-IV cosmic shear
• Three-point intrinsic alignments of dark matter halos in the IllustrisTNG simulation
• Dark Energy Survey Year 3: Blue Shear
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• Intrinsic galaxy alignments in the KiDS-1000 bright sample: dependence on colour, luminosity, morphology, and galaxy scale
• UNIONS: a direct measurement of intrinsic alignment with BOSS/eBOSS spectroscopy
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• Calibrating baryonic effects in cosmic shear with external data in the LSST era
• Parity Violation in Galaxy Shapes: Primordial Non-Gaussianity