NIHAO XVI: The properties and evolution of kinematically selected discs, bulges and stellar haloes

Abstract

We use 25 simulated galaxies from the NIHAO project to define and characterize a variety of kinematic stellar structures: thin and thick discs, large scale single discs, classical and pseudo bulges, spheroids, inner discs, and stellar haloes. These structures have masses, spins, shapes and rotational support in good agreement with theoretical expectations and observational data. Above a dark matter halo mass of $2.5\times 10^{11}{M}_{\odot }$, all galaxies have a classical bulge and 70\% have a thin and thick disc. The kinematic (thin) discs follow a power-law relation between angular momentum and stellar mass $J_{\ast }=3.4M_{\ast }^{1.26\pm 0.06}$, in very good agreement with the prediction based on the empirical stellar-to-halo mass relation in the same mass range, and show a strong correlation between maximum `observed' rotation velocity and dark matter halo circular velocity $v_{\mathrm{c}}=6.4v_{\max }^{0.64\pm 0.04}$. Tracing back in time these structures' progenitors, we find all to lose a fraction $1-f_j$ of their maximum angular momentum. Thin discs are significantly better at retaining their high-redshift spins ($f_j\sim 0.70$) than thick ones ($f_j\sim 0.40$). Stellar haloes have their progenitor baryons assembled the latest ($z_{1/2}\sim 1.1$) and over the longest timescales ($\tau \sim 6.2$~Gyr), and have the smallest fraction of stars born in-situ ($f_{\mathrm{in}-\mathrm{situ}}=0.35\pm 0.14$). All other structures have $1.5\lesssim z_{1/2}\lesssim 3$, $\tau =4\pm 2$~Gyr and $f_{\mathrm{in}-\mathrm{situ}}\gtrsim 0.9$.

arXiv commentAccepted by MNRAS. First application of the methods described in arXiv:1804.05576

References in corpus (107)

• Scikit-learn: Machine Learning in Python
• The NumPy array: a structure for efficient numerical computation
• A Universal Density Profile from Hierarchical Clustering
• Galactic Stellar and Substellar Initial Mass Function
• Planck 2013 results. XVI. Cosmological parameters
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• The Average Star Formation Histories of Galaxies in Dark Matter Halos from z=0-8
• The Formation of Galactic Disks
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• The propagation of uncertainties in stellar population synthesis modeling I: The relevance of uncertain aspects of stellar evolution and the IMF to the derived physical properties of galaxies
• Stellar mass-to-light ratios and the Tully-Fisher relation
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Secular Evolution and the Formation of Pseudobulges in Disk Galaxies
• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• Galactic star formation and accretion histories from matching galaxies to dark matter haloes
• CALIFA, the Calar Alto Legacy Integral Field Area survey: I. Survey presentation
• Radiative transfer in a clumpy universe: IV. New synthesis models of the cosmic UV/X-ray background
• FIRE-2 Simulations: Physics versus Numerics in Galaxy Formation
• A universal angular momentum profile for galactic halos
• The Radial Velocity Experiment (RAVE): first data release
• Ahf: Amiga's Halo Finder
• 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
• Improving convergence in smoothed particle hydrodynamics simulations without pairing instability
• Star Formation and Feedback in Smoothed Particle Hydrodynamic Simulations--I. Isolated Galaxies
• Gasoline: An adaptable implementation of TreeSPH
• The APOSTLE simulations: solutions to the Local Group's cosmic puzzles
• Simulations of Galaxy Formation in a Lambda CDM Universe II: The Fine Structure of Simulated Galactic Disks
• The Auriga Project: the properties and formation mechanisms of disc galaxies across cosmic time
• PRIMUS: Constraints on Star Formation Quenching and Galaxy Merging, and the Evolution of the Stellar Mass Function From z=0-1
• Structural Properties of Pseudo-Bulges, Classical Bulges and Elliptical Galaxies: an SDSS Perspective
• Structural Parameters of Galaxies in CANDELS
• The Formation of Disk Galaxies
• COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies: I. Relations between H2, HI, stellar content and structural properties
• Rapid formation of exponential disks and bulges at high redshift from the dynamical evolution of clump cluster and chain galaxies
• The evolution substructure I: a new identification method
• Making Galaxies in a Cosmological Context: The Need for Early Stellar Feedback
• EMERGE - An empirical model for the formation of galaxies since $z\sim 10$
• The Enrichment of the Intergalactic Medium with Adiabatic Feedback I: Metal Cooling and Metal Diffusion
• NIHAO project I: Reproducing the inefficiency of galaxy formation across cosmic time with a large sample of cosmological hydrodynamical simulations
• The Emergence of the Thick Disk in a CDM Universe
• Modelling discontinuities and Kelvin-Helmholtz instabilities in SPH
• Baryon effects on the internal structure of LCDM halos in the EAGLE simulations
• The thick disks of spiral galaxies as relics from gas-rich, turbulent, clumpy disks at high redshift
• The Dual Origin of Stellar Halos
• Bulge Formation by the Coalescence of Giant Clumps in Primordial Disk Galaxies
• Structural Parameters of Thin and Thick Disks in Edge-On Disk Galaxies
• The population of barred galaxies in the local universe I. Detection and characterisation of bars
• NIHAO IV: Core creation and destruction in dark matter density profiles across cosmic time
• A mass-dependent density profile for dark matter haloes including the influence of galaxy formation
• Angular momentum and galaxy formation revisited
• Gasoline2: A Modern SPH Code
• Connecting Angular Momentum and Galactic Dynamics: The complex Interplay between Spin, Mass, and Morphology
• Hierarchical formation of bulgeless galaxies: Why outflows have low angular momentum
• The Outer Disks of Early-Type Galaxies. I. Surface-Brightness Profiles of Barred Galaxies
• Galactic Angular Momentum in the Illustris Simulation: Feedback and the Hubble Sequence
• The DiskMass Survey. I. Overview
• A Structural and Dynamical Study of Late-Type, Edge-On Galaxies: II. Vertical Color Gradients and the Detection of Ubiquitous Thick Disks
• A Necessary Condition for Individual Time-Steps in SPH Simulations
• Hierarchical formation of bulgeless galaxies II: Redistribution of angular momentum via galactic fountains
• Building Late-Type Spiral Galaxies by In-Situ and Ex-Situ Star Formation
• Chemical signatures of formation processes in the stellar populations of simulated galaxies
• Multiphase Smoothed-Particle Hydrodynamics
• Detection of the old stellar component of the major Galactic bar
• The Impact of Feedback on Disk Galaxy Scaling Relations
• Fundamental Mass-Spin-Morphology Relation of Spiral Galaxies
• Formation of In Situ Stellar Haloes in Milky Way-Mass Galaxies
• Thick disks of edge-on galaxies seen through the Spitzer Survey of Stellar Structure in Galaxies (S4G): Lair of missing baryons?
• NIHAO XV: The environmental impact of the host galaxy on galactic satellite and field dwarf galaxies
• Two-dimensional multi-component photometric decomposition of CALIFA galaxies
• Angular Momentum and Galaxy Formation Revisited: Effects of Variable Mass-to-light Ratios
• Diverse Stellar Haloes in Nearby Milky Way-Mass Disc Galaxies
• Parametrizing the Stellar Haloes of Galaxies
• Giant clumps in the FIRE simulations: a case study of a massive high-redshift galaxy
• A diversity of progenitors and histories for isolated spiral galaxies
• The DiskMass Survey. VI. Gas and stellar kinematics in spiral galaxies from PPak integral-field spectroscopy
• An observer's view of simulated galaxies: disc-to-total ratios, bars, and (pseudo-)bulges
• The Extragalactic Distance Database: All Digital HI Profile Catalog
• Orbital decomposition of CALIFA spiral galaxies
• NIHAO IX: the role of gas inflows and outflows in driving the contraction and expansion of cold dark matter haloes
• When Is a Bulge Not a Bulge? Inner Disks Masquerading as Bulges in NGC 2787 and NGC 3945
• Do black hole masses scale with classical bulge luminosities only? The case of the two composite pseudobulge galaxies NGC3368 and NGC3489
• Secular- and merger-built bulges in barred galaxies
• On the Radio Detectability of Circumplanetary Discs
• A Systematic Look at the Effects of Radiative Feedback on Disc Galaxy Formation
• Angular Momentum and Galaxy Formation Revisited: Scaling Relations for Disks and Bulges
• The Kinematics of Thick Disks in Nine External Galaxies
• NIHAO X: Reconciling the local galaxy velocity function with Cold Dark Matter via mock HI observations
• Lick Indices in the Thin and Thick Disks of Edge-On Disk Galaxies
• NIHAO XIII: Clumpy discs or clumpy light in high redshift galaxies?
• NIHAO VI. The hidden discs of simulated galaxies
• The reports of thick discs' deaths are greatly exaggerated: thick discs are NOT artefacts caused by diffuse scattered light
• How to Reconcile the Observed Velocity Function of Galaxies with Theory
• Natures of a clump-origin bulge: a pseudobulge-like but old metal-rich bulge
• A Slippery Slope: Systematic Uncertainties in the Line Width Baryonic Tully-Fisher Relation
• Stars behind bars I: The Milky Way's central stellar populations
• Formation of galaxies in ΛCDM cosmologies. I. The fine structure of disc galaxies
• Evidence for the concurrent growth of thick discs and central mass concentrations from S${}^4$G imaging
• Thick Disks in the Hubble Space Telescope Frontier Fields
• Detection of a Pseudobulge Hidden Inside the "Box-Shaped Bulge" of NGC 4565
• Introducing galactic structure finder: the multiple stellar kinematic structures of a simulated Milky Way mass galaxy
• Galactic angular momentum in cosmological zoom-in simulations. I. Disk and bulge components and the galaxy--halo connection
• Dynamics for Galactic Archaeology
• The Diversity of Thick Galactic Discs
• Morphology and kinematics of orbital components in CALIFA galaxies across the Hubble sequence
• Encounters between spherical galaxies I: systems without dark halo
• Declining rotation curves at $z=2$ in $\Lambda$CDM galaxy formation simulations
• The Radial Distribution of Mono-Metallicity Populations in the Galactic Disk as Evidence for Two-Phase Disk Formation

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• The GALAH Survey: Chemical tagging and chrono-chemodynamics of accreted halo stars with GALAH+ DR3 and $Gaia$ eDR3
• GalaxyNet: Connecting galaxies and dark matter haloes with deep neural networks and reinforcement learning in large volumes
• The Dekel-Zhao profile: A mass-dependent dark-matter density profile with flexible inner slope and analytic potential, velocity dispersion, and lensing properties
• Galactic angular momentum in the IllustrisTNG simulation -- I. Connection to morphology, halo spin, and black hole mass
• Kinematic decomposition of IllustrisTNG disk galaxies: morphology and relation with morphological structures
• New Horizon: On the origin of the stellar disk and spheroid of field galaxies at $z=0.7$
• The challenge of simultaneously matching the observed diversity of chemical abundance patterns in cosmological hydrodynamical simulations
• Identifying kinematic structures in simulated galaxies using unsupervised machine learning
• Exploring the origin of thick disks using the NewHorizon and Galactica simulations
• Introducing galactic structure finder: the multiple stellar kinematic structures of a simulated Milky Way mass galaxy
• Mass of the dynamically hot inner stellar halo predicts the ancient accreted stellar mass
• The Evolutionary Pathways of Disk-, Bulge-, and Halo-dominated Galaxies
• Stars behind bars II: A cosmological formation scenario for the Milky Way's central stellar structure
• A first estimate of the Milky Way dark matter halo spin
• Local photoionization feedback effects on galaxies
• Explaining the chemical trajectories of accreted and in-situ halo stars of the Milky Way
• Milky Way-like galaxies: stellar population properties of dynamically defined disks, bulges and stellar halos
• Internally-driven warps in disc galaxies
• Drivers of disc tilting I: Correlations and possible drivers for Milky Way analogues
• The formation history of the Milky Way disc with high-resolution cosmological simulations
• Where Did the Outskirts Go? Outer Stellar Haloes as a Sensitive Probe of Supernova Feedback
• Using Artificial Intelligence and real galaxy images to constrain parameters in galaxy formation simulations
• The dawn is quiet here: Rise in [$\alpha$/Fe] is a signature of massive gas accretion that fueled proto-Milky Way
• NIHAO-LG: The uniqueness of Local Group dwarf galaxies
• New families in our Solar neighborhood: applying Gaussian Mixture models for objective classification of structures in the Milky Way and in simulations