3D intrinsic shapes of quiescent galaxies in observations and simulations

Abstract

We study the intrinsic 3D shapes of quiescent galaxies over the last half of cosmic history based on their axial ratio distribution. To this end, we construct a sample of unprecedented size, exploiting multi-wavelength $u$-to-$K_s$ photometry from the deep wide area surveys KiDS+VIKING paired with high-quality $i$-band imaging from HSC-SSP. Dependencies of the shapes on mass, redshift, photometric bulge prominence and environment are considered. For comparison, the intrinsic shapes of quenched galaxies in the IllustrisTNG simulations are analyzed and contrasted to their formation history. We find that over the full $0<z<0.9$ range, and in both simulations and observations, spheroidal 3D shapes become more abundant at $M_{\ast }>10^{11}{M}_{\odot }$, with the effect being most pronounced at lower redshifts. In TNG, the most massive galaxies feature the highest ex-situ stellar mass fractions, pointing to violent relaxation via mergers as the mechanism responsible for their 3D shape transformation. Larger differences between observed and simulated shapes are found at low to intermediate masses. At any mass, the most spheroidal quiescent galaxies in TNG feature the highest bulge mass fractions, and conversely observed quiescent galaxies with the highest bulge-to-total ratios are found to be intrinsically the roundest. Finally, we detect an environmental influence on galaxy shape, at least at the highest masses, such that at fixed mass and redshift quiescent galaxies tend to be rounder in denser environments.

arXiv commentAccepted by MNRAS. 18 pages, 11 figures, 2 tables

References in corpus (82)

• emcee: The MCMC Hammer
• Stellar population synthesis at the resolution of 2003
• Galactic Stellar and Substellar Initial Mass Function
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Stellar Masses and Star Formation Histories for 10^5 Galaxies from the Sloan Digital Sky Survey
• CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Simulating Galaxy Formation with the IllustrisTNG Model
• EAZY: A Fast, Public Photometric Redshift Code
• First results from the IllustrisTNG simulations: matter and galaxy clustering
• Galaxy Harassment and the Evolution of Clusters of Galaxies
• First results from the IllustrisTNG simulations: the stellar mass content of groups and clusters of galaxies
• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• Color Separation of Galaxy Types in the Sloan Digital Sky Survey Imaging Data
• First results from the IllustrisTNG simulations: the galaxy color bimodality
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• The Environmental Dependence of the Relations between Stellar Mass, Structure, Star Formation and Nuclear Activity in Galaxies
• First results from the IllustrisTNG simulations: A tale of two elements -- chemical evolution of magnesium and europium
• Simulating galaxy formation with black hole driven thermal and kinetic feedback
• First results from the IllustrisTNG simulations: radio haloes and magnetic fields
• Formation of Massive Galaxies at High Redshift: Cold Streams, Clumpy Disks and Compact Spheroids
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• First Results from the TNG50 Simulation: Galactic outflows driven by supernovae and black hole feedback
• Modeling the Panchromatic Spectral Energy Distributions of Galaxies
• First Results from the TNG50 Simulation: The evolution of stellar and gaseous disks across cosmic time
• Dancing in the dark: galactic properties trace spin swings along the cosmic web
• The SAURON project -- IX. A kinematic classification for early-type galaxies
• Galaxy Star-Formation as a Function of Environment in the Early Data Release of the Sloan Digital Sky Survey
• The ATLAS3D project - III. A census of the stellar angular momentum within the effective radius of early-type galaxies: unveiling the distribution of Fast and Slow Rotators
• Galaxy Structure and Mode of Star Formation in the SFR-Mass Plane from z ~ 2.5 to z ~ 0.1
• The Atlas3D project - XX. Mass-size and mass-sigma distributions of early-type galaxies: bulge fraction drives kinematics, mass-to-light ratio, molecular gas fraction and stellar initial mass function
• Galaxy And Mass Assembly (GAMA): end of survey report and data release 2
• The Sydney-AAO Multi-object Integral field spectrograph (SAMI)
• Second Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• COSMOS : Hubble Space Telescope Observations
• Structure and Kinematics of Early-Type Galaxies from Integral-Field Spectroscopy
• The Hyper Suprime-Cam Software Pipeline
• The NEWFIRM Medium-band Survey: Photometric Catalogs, Redshifts and the Bimodal Color Distribution of Galaxies out to z~3
• The Morphology-Density Relation in the Sloan Digital Sky Survey
• Statistical Properties of Collisionless Equal- and Unequal-Mass Merger Remnants of Disk Galaxies
• GEMS: Galaxy Evolution from Morphologies and SEDs
• A Public Ks-selected Catalog in the COSMOS/UltraVISTA Field: Photometry, Photometric Redshifts and Stellar Population Parameters
• Kinematic Structure of Merger Remnants
• The ATLAS${}^{3D}$ project - XXV: Two-dimensional kinematic analysis of simulated galaxies and the cosmological origin of fast and slow rotators
• The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees
• 4MOST: Project overview and information for the First Call for Proposals
• NON-AXISYMMETRIC STRUCTURES IN THE STELLAR DISKS OF GALAXIES
• The first and second data releases of the Kilo-Degree Survey
• The influence of gas on the structure of merger remnants
• The Dependence of Cluster Galaxy Star Formation Rates on the Global Environment
• Star-Forming Galaxies at Cosmic Noon
• Spatially-Resolved Spectroscopic Properties of Low-Redshift Star-Forming Galaxies
• A Large Population of Massive Compact Post-Starburst Galaxies at z>1: Implications for the Size Evolution and Quenching Mechanism of Quiescent Galaxies
• Empirical determination of the shape of dust attenuation curves in star-forming galaxies
• Galactic Angular Momentum in the Illustris Simulation: Feedback and the Hubble Sequence
• The role of mergers and halo spin in shaping galaxy morphology
• Geometry of Star-Forming Galaxies from SDSS, 3D-HST and CANDELS
• How Well Can We Measure the Stellar Mass of a Galaxy: The Impact of the Assumed Star Formation History Model in SED Fitting
• How well can we really estimate the stellar masses of galaxies from broadband photometry?
• A Critical Assessment of Stellar Mass Measurement Methods
• The evolution of the galaxy stellar mass function over the last twelve billion years from a combination of ground-based and HST surveys
• Recovering Stellar Population Properties and Redshifts from Broad-Band Photometry of Simulated Galaxies: Lessons for SED Modeling
• The shapes of galaxies in the Sloan Digital Sky Survey
• The MASSIVE Survey - VII. The Relationship of Angular Momentum, Stellar Mass and Environment of Early-Type Galaxies
• The Origin and Evolution of Fast and Slow Rotators in the Illustris Simulation
• Major Merging: The Way to Make a Massive, Passive Galaxy
• Structural Evolution of Early-type Galaxies to z=2.5 in CANDELS
• The SAMI Galaxy Survey: comparing 3D spectroscopic observations with galaxies from cosmological hydrodynamical simulations
• Evidence from Intrinsic Shapes for Two Families of Elliptical Galaxies
• The Dependence of Galaxy Shape on Luminosity and Surface Brightness Profile
• Spurious heating of stellar motions in simulated galactic disks by dark matter halo particles
• The evolution of galaxy shapes in CANDELS: from prolate to oblate
• Glimpsing the Imprint of Local Environment on the Galaxy Stellar Mass Function
• A constant limiting mass scale for flat early-type galaxies from z=1 to z=0: density evolves but shapes do not
• Shape Evolution of Massive Early-Type Galaxies: Confirmation of Increased Disk Prevalence at z>1
• Galaxy properties as revealed by MaNGA II. Differences in stellar populations of slow and fast rotator ellipticals and dependence on environment
• The SAMI Galaxy Survey: Mass and Environment as Independent Drivers of Galaxy Dynamics
• VIS3COS: II. Nature and nurture in galaxy structure and morphology
• High Redshift Massive Quiescent Galaxies are as Flat as Star Forming Galaxies: The Flattening of Galaxies and the Correlation with Structural Properties in CANDELS/3D-HST
• Stellar Kinematics and Environment at z~0.8 in the LEGA-C Survey: Massive, Slow-Rotators are Built First in Overdense Environments
• Evolution of 3-dimensional Shape of Passively Evolving and Star-forming Galaxies at $z<1$