Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys

Abstract

The intrinsic alignment of galaxy shapes (by means of their angular momentum) and their cross-correlation with the surrounding dark matter tidal field are investigated using the 160 000, z=1.2 synthetic galaxies extracted from the high-resolution cosmological hydrodynamical simulation Horizon-AGN. One- and two-point statistics of the spin of the stellar component are measured as a function of mass and colour. For the low-mass galaxies, this spin is locally aligned with the tidal field `filamentary' direction while, for the high-mass galaxies, it is perpendicular to both filaments and walls. The bluest galaxies of our synthetic catalog are more strongly correlated with the surrounding tidal field than the reddest galaxies, and this correlation extends up to 10 Mpc/h comoving distance. We also report a correlation of the projected ellipticities of blue, intermediate mass galaxies on a similar scale at a level of 10^(-4) which could be a concern for cosmic shear measurements. We do not report any measurable intrinsic alignments of the reddest galaxies of our sample. This work is a first step toward the use of very realistic catalog of synthetic galaxies to evaluate the contamination of weak lensing measurement by the intrinsic galactic alignments.

15 pages, accepted for publication in MNRAS

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• Bayesian analysis of the dynamic cosmic web in the SDSS galaxy survey
• Alignment of galaxies relative to their local environment in SDSS-DR8
• Alignment between filaments and galaxy spins from the MaNGA integral-field survey
• The Dark Energy Survey Year 3 and eBOSS: constraining galaxy intrinsic alignments across luminosity and colour space
• Following The Cosmic Evolution Of Pristine Gas I: Implications For Milky Way Halo Stars
• The mass dependence of dark matter halo alignments with large-scale structure
• Weak lensing in the Horizon-AGN simulation lightcone. Small scale baryonic effects
• Measuring alignments between galaxies and the cosmic web at $z\sim 2-3$ using IGM tomography
• Accuracy requirements on intrinsic alignments for Stage-IV cosmic shear
• An Observed Transition of Galaxy Spins on the Void Surfaces
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• Cosmological evolution of orientations of cluster-sized dark matter haloes and their central galaxies in the Horizon-AGN simulation
• Probing the Cosmological Principle with weak lensing shear
• Galaxy clusters as intrinsic alignment tracers: present and future
• A rising tide: Intrinsic alignments since the turn of the millennium
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• Reoriented Memory of Galaxy Spins for the Early Universe
• The Density Parity Model for the Evolution of the Subhalo Inner Spin Alignments with the Cosmic Web
• STRAWBERRY: Finding haloes in the gravitational potential
• Boosting (In)direct Detection of Dark Matter
• Realistic systematic biases induced by residual intrinsic alignments in cosmic shear surveys