Cosmological evolution of orientations of cluster-sized dark matter haloes and their central galaxies in the Horizon-AGN simulation

Abstract

It is known observationally that the major axes of galaxy clusters and their brightest cluster galaxies are roughly aligned with each other. To understand the origin of the alignment, we identify 40 cluster-sized dark matter (DM) haloes with masses higher than $5\times 10^{13}{M}_{\odot }$ and their central galaxies (CGs) at $z\approx 0$ in the Horizon-AGN cosmological hydrodynamical simulation. We trace the progenitors at 50 different epochs between $0<z<5$. We then fit their shapes and orientations with a triaxial ellipsoid model. While the orientations of both DM haloes and CGs change significantly due to repeated mergers and mass accretions, their relative orientations are well aligned at each epoch even at high redshifts, $z>1$. The alignment becomes tighter with cosmic time; the major axes of the CGs and their host DM haloes at present are aligned on average within $\sim 30^{\circ }$ in the three dimensional space and $\sim 20^{\circ }$ in the projected plane. The orientations of the major axes of DM haloes on average follow one of the eigen-vectors of the surrounding tidal field that corresponds to the {\it slowest collapsing} (or even stretching) mode, and the alignment with the tidal field also becomes tighter. This implies that the orientations of CGs and DM haloes at the present epoch are largely imprinted in the primordial density field of the Universe, whereas strong dynamical interactions such as mergers are important to explain their mutual alignment at each epoch.

arXiv comment14 pages, 11 figures

References in corpus (39)

• Dancing in the dark: galactic properties trace spin swings along the cosmic web
• Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations
• First Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• Intrinsic alignment-lensing interference as a contaminant of cosmic shear
• The Horizon-AGN simulation: morphological diversity of galaxies promoted by AGN feedback
• Intrinsic and Extrinsic Galaxy Alignment
• The origin and implications of dark matter anisotropic cosmic infall on ~L* haloes
• The Origin of the Brightest Cluster Galaxies
• The Evolution of Dark Matter Halo Properties in Clusters, Filaments, Sheets and Voids
• Intrinsic galaxy alignments from the 2SLAQ and SDSS surveys: luminosity and redshift scalings and implications for weak lensing surveys
• Building Merger Trees from Cosmological N-body Simulations
• The Horizon-AGN simulation: evolution of galaxy properties over cosmic time
• Density profile of dark matter haloes and galaxies in the Horizon-AGN simulation: the impact of AGN feedback
• Intrinsic alignments of galaxies in the Horizon-AGN cosmological hydrodynamical simulation
• The alignment and shape of dark matter, stellar, and hot gas distributions in the EAGLE and cosmo-OWLS simulations
• Galaxy orientation with the cosmic web across cosmic time
• Intrinsic alignment of simulated galaxies in the cosmic web: implications for weak lensing surveys
• Mergers drive spin swings along the cosmic web
• The SAMI Galaxy Survey: First detection of a transition in spin orientation with respect to cosmic filaments in the stellar kinematics of galaxies
• Probing the Intrinsic Shape and Alignment of Dark Matter Haloes using SDSS Galaxy Groups
• The orientation of galaxy dark matter haloes around cosmic voids
• Spatial and kinematic alignments between central and satellite halos
• Galaxy-halo alignments in the Horizon-AGN cosmological hydrodynamical simulation
• Galaxy shapes and alignments in the MassiveBlack-II hydrodynamic and dark matter-only simulations
• The angular momentum of dark halos: merger and accretion effects
• Redshift and luminosity evolution of the intrinsic alignments of galaxies in Horizon-AGN
• The ellipticity of galaxy cluster halos from satellite galaxies and weak lensing
• Intrinsic alignments in redMaPPer clusters -- I. Central galaxy alignments and angular segregation of satellites
• Detecting Galaxy-Filament Alignments in the Sloan Digital Sky Survey III
• First results on the cluster galaxy population from the Subaru Hyper Suprime-Cam survey. III. Brightest cluster galaxies, stellar mass distribution, and active galaxies
• The alignment of dark matter halos with the cosmic web
• Ten Billion Years of Brightest Cluster Galaxy Alignments
• Detection of intrinsic cluster alignments to 100 Mpc/h in the SDSS
• The mass dependence of dark matter halo alignments with large-scale structure
• Strong orientation dependence of surface mass density profiles of dark haloes at large scales
• Total density profile of massive early-type galaxies in Horizon-AGN simulation: impact of AGN feedback and comparison with observations
• Intrinsic alignment of redMaPPer clusters: cluster shape - matter density correlation
• Projected alignment of non-sphericities of stellar, gas, and dark matter distributions in galaxy clusters: analysis of the Horizon-AGN simulation
• Revisiting the Galaxy Shape and Spin Alignments with the Large-Scale Tidal Field: An Effective Practical Model

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• Galaxy-group (halo) alignments from SDSS DR7 and the ELUCID simulation
• The spatial distribution of satellites in galaxy clusters
• Living with Neighbors. IV. Dissecting the Spin$-$Orbit Alignment of Dark Matter Halos: Interacting Neighbors and the Local Large-scale Structure