An N-body/SPH Study of Isolated Galaxy Mass Density Profiles

Abstract

We investigate the evolution of mass density profiles in secular disk galaxy models, paying special attention to the development of a two-component profile from a single initial exponential disk free of cosmological evolution (i.e., no accretion or interactions). As the source of density profile variations, we examine the parameter space of the spin parameter, halo concentration, virial mass, disk mass and bulge mass, for a total of 162 simulations in the context of a plausible model of star formation and feedback (GADGET-2). The evolution of the galaxy mass density profile, including the development of a two-component profile with an inner and outer segment, is controlled by the ratio of the disk mass fraction, $m_d$, to the halo spin parameter, $\lambda$. The location of the break between the two components and speed at which it develops is directly proportional to $m_d/\lambda$; the amplitude of the transition between the inner and outer regions is however controlled by the ratio of halo concentration to virial velocity. The location of the divide between the inner and outer profile does not change with time. (Abridged)

27 pages, 31 figures. Accepted for publication at MNRAS. A high-resolution version of the paper with figures can be found here http://www.mpia-hd.mpg.de/~foyle/papers/MN-07-1491-MJ.R1.pdf

References in corpus (55)

• The cosmological simulation code GADGET-2
• The Global Schmidt Law in Star Forming Galaxies
• Simulating the joint evolution of quasars, galaxies and their large-scale distribution
• Cosmological SPH simulations: A hybrid multi-phase model for star formation
• Secular Evolution and the Formation of Pseudobulges in Disk Galaxies
• The New Galaxy: Signatures of its Formation
• Cosmological SPH simulations: The entropy equation
• Gasoline: An adaptable implementation of TreeSPH
• Forming Disk Galaxies in Lambda CDM Simulations
• What determines the strength and the slowdown rate of bars ?
• The Formation of Disk Galaxies
• Morphology, photometry and kinematics of N-body bars. I Three models with different halo central concentrations
• Star Formation Thresholds in Galactic Disks
• The Secular Evolution of Disk Structural Parameters
• Can Photoionization Squelching Resolve the Sub-structure Crisis?
• The Effects of a Photoionizing UV Background on the Formation of Disk Galaxies
• Dark Halo and Disk Galaxy Scaling Laws in Hierarchical Universes
• Formation of early-type galaxies from cosmological initial conditions
• Beyond Inside-Out Growth: Formation and Evolution of Disk Outskirts
• A Near-Infrared Study of 2MASS Bars in Local Galaxies: An Anchor for High Redshift Studies
• The structure of galactic disks: Studying late-type spiral galaxies using SDSS
• Structure of Disk Dominated Galaxies I. Bulge/Disk Parameters, Simulations, and Secular Evolution
• A Revised Model for the Formation of Disk Galaxies: Low Spin and Dark-Halo Expansion
• The Formation of a Realistic Disk Galaxy in Lambda Dominated Cosmologies
• The cosmological origin of the Tully-Fisher relation
• Galaxy Formation: CDM, Feedback and the Hubble Sequence
• Scaling Relations of Spiral Galaxies
• The Star Formation Rate in disk galaxies: thresholds and dependence on gas amount
• Anti-Truncation of Disks in Early-Type Barred Galaxies
• The Outer Disks of Early-Type Galaxies. I. Surface-Brightness Profiles of Barred Galaxies
• Broad-Band Imaging of a Large Sample of Irregular Galaxies
• Lopsided Spiral Galaxies and a Limit on the Galaxy Accretion Rate
• Implementing Feedback in Simulations of Galaxy Formation: A Survey of Methods
• Tidal tails in CDM cosmologies
• The Formation of Disk-Bulge-Halo Systems and the Origin of the Hubble Sequence
• Local Axisymmetric Instability Criterion in the Thin, Rotating, Multicomponent Disk
• An Explanation for the Observed Weak Size Evolution of Disk Galaxies
• Secular bar formation in galaxies with significant amount of dark matter
• The Origin of the Density Distribution of Disk Galaxies: A New Problem for the Standard Model of Disk Formation
• NGC 300: an extremely faint, outer stellar disk observed to 10 scale lengths
• Angular momentum transport and disk morphology in SPH simulations of galaxy formation
• Star Formation, Supernovae Feedback and the Angular Momentum Problem in Numerical CDM Cosmogony: Half Way There?
• Radial Profiles of Star Formation in the Far Outer Regions of Galaxy Disks
• Stellar disk truncations at high-z: probing inside-out galaxy formation
• The Evolution of Stellar Exponential Discs
• Spatial Distribution of Low Surface Brightness Galaxies
• Dark Matter Halos of Disk Galaxies: Constraints from the Tully-Fisher Relation
• Momentum transfer across shear flows in Smoothed Particle Hydrodynamic simulations of galaxy formation
• Truncation of stellar disks in galaxies at z~1
• The length of stellar bars in SB galaxies and N-body simulations
• A Dimensional study of Disk Galaxies
• Bar instability in cosmological halos
• Forming stars on a viscous timescale: the key to exponential stellar profiles in disk galaxies?
• The puzzle about the radial cut-off in galactic disks
• Confronting Scaling Relations of Spiral Galaxies with Hierarchical Models of Disk Formation

Cited by in corpus (55)

• How Do Disks Survive Mergers?
• Secular Evolution in Disk Galaxies
• Inclination- and dust-corrected galaxy parameters: Bulge-to-disc ratios and size-luminosity relations
• Chemodynamical evolution of the Milky Way disk II: Variations with Galactic radius and height above the disk plane
• Evolution of Galactic Discs: Multiple Patterns, Radial Migration and Disc Outskirts
• Color Profiles of Spiral Galaxies: Clues on Outer-Disk Formation Scenarios
• The Origin of the Light Distribution in Spiral Galaxies
• The effective stability parameter for two-component galactic discs: Is 1/Q ~ 1/Q_stars + 1/Q_gas ?
• The impact of bars on disk breaks as probed by S4G imaging
• Galaxy Zoo: The Environmental Dependence of Bars and Bulges in Disc Galaxies
• On the Origin of Exponential Galaxy Disks
• The Outer Disks of Early-Type Galaxies. II. Surface-Brightness Profiles of Unbarred Galaxies and Trends with Hubble Type
• An Investigation of Sloan Digital Sky Survey Imaging Data and Multi-Band Scaling Relations of Spiral Galaxies (with Dynamical Information)
• Exponential Galaxy Disks from Stellar Scattering
• On the Global Mass Distribution in Disk Galaxies
• Bulges Of Nearby Galaxies With Spitzer: The Growth Of Pseudobulges In Disk Galaxies And Its Connection To Outer Disks
• Unveiling the Structure of Barred Galaxies at 3.6 $\mu \mathrm{m}$ with the Spitzer Survey of Stellar Structure in Galaxies (S${}^4$G): I. Disk Breaks
• Disk galaxies with broken luminosity profiles from cosmological simulations
• The formation of a thick disk through the heating of a thin disk: Agreement with orbital eccentricities of stars in the solar neighborhood
• Cosmic Evolution of Stellar Disk Truncations: From z~1 to the Local Universe
• Stellar Populations and Radial Migrations in Virgo Disk Galaxies
• The Formation and Evolution of Virgo Cluster Galaxies - II. Stellar Populations
• The Near-IR Luminosity Function and Bimodal Surface Brightness Distribution of Virgo Cluster Galaxies
• The environmental dependence of the structure of outer galactic discs in STAGES spiral galaxies
• Dust emission profiles of DustPedia galaxies
• A Consistent Set of Empirical Scaling Relations for Spiral Galaxies: The $(v_{\max },M_{\mathrm{DM}})$-$({\sigma }_0,M_{\mathrm{BH}},\varphi )$ Relations
• The Origin of Exponential Star-forming Disks
• How do spiral arm contrasts relate to bars, disk breaks and other fundamental galaxy properties?
• Searching for Non-axisymmetries in NGC 6503: A Weak End-on Bar
• Influence of galaxy stellar mass and observed wavelength on disc breaks in S${}^4$G, NIRS0S, and SDSS data
• On the galactic spin of barred disk galaxies
• Bulge-Disk Decompositions and Structural Bimodality of Ursa Major Cluster Spiral Galaxies
• Unveiling the nature of M94's (NGC4736) outer region: a panchromatic perspective
• The effect of environment on the structure of disc galaxies
• Star Formation and Feedback in Smoothed Particle Hydrodynamic Simulations II: Resolution Effects
• How to bend galaxy disc profiles II: stars surfing the bar in Type-III discs
• An Observational Estimate for the Mean Secular Evolution Rate in Spiral Galaxies
• The NIR structure of the barred galaxy NGC253 from VISTA
• Extragalactic archeology with the GHOSTS Survey I. - Age-resolved disk structure of nearby low-mass galaxies
• Exponential Disks from Stellar Scattering: III. Stochastic Models
• Beyond Sérsic + exponential disc morphologies in the Coma Cluster
• Bar Classification based on the Potential Map
• Introducing a new 3D dynamical model for barred galaxies
• The secular growth of bars revealed by flat (peak + shoulders) density profiles
• The Prevalence of Type III Disc Breaks in HI-rich and Low-spin Galaxies
• The Impact of Stellar Migration on Disk Outskirts
• Forming disc galaxies in major mergers: III. The effect of angular momentum on the radial density profiles of disc galaxies
• Dynamical Models for NGC 6503 using a Markov Chain Monte Carlo Technique
• When Should We Treat Galaxies as Isolated?
• Linking star formation thresholds and truncations in the thin and thick disks of the low-mass galaxy UGC 7321
• The origin of type-I profiles in cluster lenticulars: An interplay between ram pressure stripping and tidally-induced spiral migration
• Near-exponential surface densities as hydrostatic, nonequilibrium profiles in galaxy discs
• Effective viscosity from cloud-cloud collisions in three-dimensional global SPH simulations
• Radial Distribution of Near-UV Flux in Disc Galaxies in the range 0<z<1
• Numerical Study of Bar Suppression in Galaxy Models Due to Disc Heating