Dissipationless collapse, weak homology and central cores of elliptical galaxies

Abstract

By means of high-resolution N-body simulations we revisited the dissipationless collapse scenario for galaxy formation. We considered both single-component collapses and collapses of a cold stellar distribution in a live dark matter halo. Single-component collapses lead to stellar systems whose projected profiles are fitted very well by the Sersic R^(1/m) law with 3.6 < m < 8. The stellar end-products of collapses in a dark matter halo are still well described by the R^(1/m) law, but with 1.9 < m < 12, where the lowest m values are obtained when the halo is dominant. In all the explored cases the profiles at small radii deviate from their global best-fit R^(1/m) model, being significantly flatter. The break-radius values are comparable with those measured in `core' elliptical galaxies, and are directly related to the coldness of the initial conditions. The dissipationless collapse of initially cold stellar distributions in pre-existing dark matter haloes may thus have a role in determining the observed weak homology of elliptical galaxies.

arXiv commentAccepted for publication in MNRAS (11 pages, 10 figures)

References in corpus (32)

• The Structure of Cold Dark Matter Halos
• A Fundamental Relation Between Supermassive Black Holes and Their Host Galaxies
• A Relationship Between Nuclear Black Hole Mass and Galaxy Velocity Dispersion
• The SAURON project - IV. The mass-to-light ratio, the virial mass estimator and the fundamental plane of elliptical and lenticular galaxies
• The Inner Structure of LambdaCDM Halos I: A Numerical Convergence Study
• The Centers of Early-Type Galaxies with HST. IV. Central Parameter Relations
• On the shape of the light profiles of early-type galaxies
• Formation of Galactic Nuclei
• Dynamical family properties and dark halo scaling relations of giant elliptical galaxies
• HST photometry of dwarf elliptical galaxies in Coma, and an explanation for the alleged structural dichotomy between dwarf and bright elliptical galaxies
• Massive Dark-matter halos and Evolution of Early-type Galaxies to z=1
• A Family of Models for Spherical Stellar Systems
• The Fundamental Scaling Relations of Elliptical Galaxies
• A New Empirical Model for the Structural Analysis of Early-type Galaxies and a Critical Review of the Nuker Model
• A Hierarchical O(N) Force Calculation Algorithm
• Evidence for a New Elliptical-Galaxy Paradigm: Sersic and Core Galaxies
• A Universal Density Profile for Dark and Luminous Matter?
• A Very Fast and Momentum-Conserving Tree Code
• Lost & Found Dark Matter in Elliptical Galaxies
• Galaxy merging, the Fundamental Plane of elliptical galaxies, and the Mbh-sigma relation
• The Mbh-sigma relation as a constraint on the formation of elliptical galaxies
• Galactic cannibalism and CDM density profiles
• The X-ray emission properties and the dicothomy in the central stellar cusp shapes of early-type galaxies
• Mass profiles and anisotropies of early-type galaxies
• The Analytical Distribution Function of Anisotropic Hernquist+Hernquist Models
• A family of models of partially relaxed stellar systems II. Comparison with the products of collisionless collapse
• Radial orbital anisotropy and the Fundamental Plane of elliptical galaxies
• Galactic cannibalism in the galaxy cluster C0337-2522 at z=0.59
• Dark matter in early-type galaxies: dynamical modelling of IC1459, IC3370, NGC3379 and NGC4105
• Modelling elliptical galaxies: phase-space constraints on two-component (gamma1,gamma2) models
• The origin and formation of cuspy density profiles through violent relaxation of stellar systems
• Dissipationless Collapse of Spherical Protogalaxies and the Fundamental Plane

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• Empirical models for Dark Matter Halos. I. Nonparametric Construction of Density Profiles and Comparison with Parametric Models
• The Structure & Dynamics of Massive Early-type Galaxies: On Homology, Isothermality and Isotropy inside one Effective Radius
• TDCOSMO IV: Hierarchical time-delay cosmography -- joint inference of the Hubble constant and galaxy density profiles
• Inclination- and dust-corrected galaxy parameters: Bulge-to-disc ratios and size-luminosity relations
• The Black Hole Mass - Spheroid Luminosity relation
• The Carnegie-Irvine Galaxy Survey. III. The Three-Component Structure of Nearby Elliptical Galaxies
• The ACS Fornax Cluster Survey. II. The Central Brightness Profiles of Early-Type Galaxies: A Characteristic Radius on Nuclear Scales and the Transition from Central Luminosity Deficit to Excess
• Mapping the Dark Side with DEIMOS: Globular Clusters, X-ray Gas, and Dark Matter in the NGC 1407 Group
• Gamma-ray Signal from Earth-mass Dark Matter Microhalos
• A review of elliptical and disc galaxy structure, and modern scaling laws
• The importance of dry and wet merging on the formation and evolution of elliptical galaxies
• Central Stellar Mass Deficits in the Bulges of Local Lenticular Galaxies, and the Connection with Compact z ~ 1.5 Galaxies
• Dry mergers and the formation of early-type galaxies: constraints from lensing and dynamics
• Empirical Models for Dark Matter Halos. III. The Kormendy relation and the log(rho_e)-log(R_e) relation
• The SLUGGS Survey: Breaking degeneracies between dark matter, anisotropy and the IMF using globular cluster subpopulations in the giant elliptical NGC 5846
• Dissipationless collapses in MOND
• The role of thermal evaporation in galaxy formation
• The Evolutionary History of Galactic Bulges: Photometric and Spectroscopic Studies of Distant Spheroids in the GOODS Fields
• Bright and Dark Matter in Elliptical Galaxies: Mass and Velocity Distributions from Self-consistent Hydrodynamical Simulations
• Two-component galaxies with flat rotation curve
• On the Origin of the Dichotomy of Early-Type Galaxies: The Role of Dry Mergers and AGN Feedback
• Mass distribution and orbital anisotropy of early-type galaxies: constraints from the Mass Plane
• Two-component Jaffe models with a central black hole. I: the spherical case
• The hybrid solution for the Fundamental Plane
• N-body simulations for testing the stability of triaxial galaxies in MOND
• Relaxation of N-body systems with additive r^-α interparticle forces
• Dynamical masses of brightest cluster galaxies I: stellar velocity anisotropy and mass-to-light ratios
• Gaussian random field power spectrum and the Sérsic law
• Two-component galaxy models: the effect of density profile at large radii on the phase-space consistency
• Discreteness effects, $N-$body chaos and the onset of radial-orbit instability
• Chandra Observations of Abell 2261 Brightest Cluster Galaxy, a Candidate Host to a Recoiling Black Hole
• Symplectic coarse graining approach to the dynamics of spherical self-gravitating systems
• Stellar velocity dispersion and initial mass function gradients in dissipationless galaxy mergers
• Relaxation of spherical systems with long-range interactions: a numerical investigation
• The Structure of Galaxies: III. Two Structural Families of Ellipticals
• Radially anisotropic systems with $r^{-\alpha }$ forces: equilibrium states
• Structure of the equivalent Newtonian systems in MOND N-body simulations. Density profiles and the core-cusp problem
• Tidal mass loss in the Fornax dwarf spheroidal galaxy through N-body simulations with Gaia DR3-based orbits
• The environmental dependence of the stellar mass fundamental plane of early-type galaxies
• LeMMINGs. V. Nuclear activity and bulge properties: a detailed multi-component decomposition of $e$-MERLIN Palomar galaxies with $HST$
• A disturbance in the force. How force fluctuations hinder dynamical friction and induce core stalling