Power Spectrum of Intrinsic Alignments of Galaxies in IllustrisTNG

Abstract

We present the 3-{\it dimensional} intrinsic alignment power spectra between the projected 2d galaxy shape/spin and the 3d tidal field across $0.1<k/h{\mathrm{Mpc}}^{-1}<60$ using cosmological hydrodynamical simulation, Illustris-TNG300, at redshifts ranging from $0.3$ to $2$. The shape-tidal field alignment increases with galaxy mass and the linear alignment coefficient $A_{\mathrm{IA}}$, defined with respect to the primordial tidal field, is found to have weak redshift dependence. We also show a promising detection of the shape/spin-tidal field alignments for stellar mass limited samples and a weak or almost null signal for star-forming galaxies for the TNG300 volume, $\sim 0.01(h^{-1}\mathrm{Gpc}{)}^3$. We further study the morphology and environmental dependence of the intrinsic alignment power spectra. The shape of massive disk- and spheroid-galaxies tend to align with the tidal field. The spin of low mass disks (and spheroids at low redshifts) tend to be parallel with the tidal field, while the spin of massive spheroids and disks tend to be perpendicular to tidal field. The shape and spin of massive centrals align with the tidal field at both small and large scales. Satellites show a radial alignment within the one-halo term region, and low mass satellites have an intriguing alignment signal in the two-halo term region. We also forecast a feasibility to measure the intrinsic alignment power spectrum for spectroscopic and imaging surveys such as Subaru HSC/PFS and DESI. Our results thus suggest that galaxy intrinsic alignment can be used as a promising tool for constraining the galaxy formation models.

accepted for publication in JCAP, major change made after first version

References in corpus (21)

• Why your model parameter confidences might be too optimistic -- unbiased estimation of the inverse covariance matrix
• Dark energy constraints from cosmic shear power spectra: impact of intrinsic alignments on photometric redshift requirements
• Intrinsic galaxy alignments from the 2SLAQ and SDSS surveys: luminosity and redshift scalings and implications for weak lensing surveys
• The Intrinsic Alignment of Galaxies and its Impact on Weak Gravitational Lensing in an Era of Precision Cosmology
• Constraints on intrinsic alignment contamination of weak lensing surveys using the MegaZ-LRG sample
• The role of mergers and halo spin in shaping galaxy morphology
• Intrinsic alignments of SDSS-III BOSS LOWZ sample galaxies
• Galaxy Shapes and Intrinsic Alignments in The MassiveBlack-II Simulation
• The halo model as a versatile tool to predict intrinsic alignments
• The SAMI Galaxy Survey: First detection of a transition in spin orientation with respect to cosmic filaments in the stellar kinematics of galaxies
• Mergers drive spin swings along the cosmic web
• An EFT description of galaxy intrinsic alignments
• Separating intrinsic alignment and galaxy-galaxy lensing
• Intrinsic alignments of galaxies in the MassiveBlack-II simulation: analysis of two-point statistics
• Spatial and kinematic alignments between central and satellite halos
• The build up of the correlation between halo spin and the large scale structure
• Improving geometric and dynamical constraints on cosmology with intrinsic alignments of galaxies
• Power spectrum of halo intrinsic alignments in simulations
• Comparison between the Blue and the Red Galaxy Alignments Detected in the Sloan Digital Sky Survey
• Measuring alignments between galaxies and the cosmic web at $z\sim 2-3$ using IGM tomography
• When galaxies align: intrinsic alignments of the progenitors of elliptical galaxies in the Horizon-AGN simulation

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• A rising tide: Intrinsic alignments since the turn of the millennium
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