Stellar Bar Evolution in Cuspy and Flat-Cored Triaxial CDM Halos

Abstract

We analyze the evolution of stellar bars in galactic disks in mildly triaxial flat-core and cuspy CDM halos. We use tailored simulations of rigid and live halos which include the feedback from disk/bar onto the halo in order to test the work by El-Zant & Shlosman (2002). The latter used the Liapunov exponents to analyze the fate of bars in analytical asymmetric halos. We find: (1) The bar growth is similar in all rigid axisymmetric and triaxial halos. (2) Bars in live models vertically buckle and form a pseudobulge with a boxy/peanut shape. (3) In live axisymmetric halos, the bar strength varies little during the secular evolution. The bar pattern speed anticorrelates with the halo core size. The bar strength is larger for smaller disk-to-halo mass ratios within disk radii, the bar size correlates with the halo core sizes, and the bar pattern speeds -- with the halo central mass concentration. Bars embedded in live triaxial halos have a starkly different fate: they dissolve on ~1.5-5 Gyr due to the onset of chaos over continuous zones, leaving behind a weak oval distortion. The onset of chaos is related to the halo triaxiality, the fast rotating bar and the halo cuspiness. Before the bar dissolves, the region outside it develops strong spiral structures, especially in the live triaxial halos. (4) More angular momentum is absorbed by the triaxial halos as compared to the axisymmetric models and its exchange is mediated by resonances. (5) Cuspy halos are more susceptible than flat-core halos to having their prolateness washed out by the bar. We analyze these results in terms of the stability of trajectories and development of chaos. We set constraints on the triaxiality of DM halos by comparing our predictions to recent observations of bars out to z~1.

17 pages, 14 figures, Astrophysical Journal, in press, Vol. 637. Updated version (text, references)

References in corpus (52)

• The Structure of Cold Dark Matter Halos
• The Structure of Dark Matter Haloes in Dwarf Galaxies
• The Inner Structure of LambdaCDM Halos I: A Numerical Convergence Study
• Resolving the Structure of Cold Dark Matter Halos
• Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations
• Observational and Theoretical Constraints on Singular Dark Matter Halos
• The Structure of Dark Matter Haloes in Hierarchical Clustering Models
• H alpha rotation curves of Low Surface Brightness galaxies
• What determines the strength and the slowdown rate of bars ?
• Morphology, photometry and kinematics of N-body bars. I Three models with different halo central concentrations
• GEMS: Galaxy Evolution from Morphologies and SEDs
• Density Profiles of Dark Matter Halo are not Universal
• Evolution of Stellar Bars in Live Axisymmetric Halos: Recurrent Buckling and Secular Growth
• Dark Halos: The Flattening of the Density Cusp by Dynamical Friction
• The Cores of Dark Matter Dominated Galaxies: theory vs. observations
• The Dark Matter Distribution in Disk Galaxies
• Properties of galaxy dark matter halos from weak lensing
• The Effect of Gas Cooling on the Shapes of Dark Matter Halos
• Bar-Halo Interaction and Bar Growth
• The Structure and Dynamical Evolution of Dark Matter Halos
• NON-AXISYMMETRIC STRUCTURES IN THE STELLAR DISKS OF GALAXIES
• A Hierarchical O(N) Force Calculation Algorithm
• The Effect of Dissipation on the Shapes of Dark halos
• On the Origin of Cusps in Dark Matter Halos
• Bar Evolution Over the Last Eight Billion Years: A Constant Fraction of Strong Bars in GEMS
• Velocity trends in the debris of Sagittarius and the shape of the dark-matter halo of the Galaxy
• Bar-driven dark halo evolution: a resolution of the cusp--core controversy
• The dark matter density profile of the lensing cluster MS2137-23: a test of the cold dark matter paradigm
• Flat-Cored Dark Matter in Cuspy Clusters of Galaxies
• How universal are the density profiles of dark halos?
• Chandra Evidence for a Flattened, Triaxial Dark Matter Halo in the Elliptical Galaxy NGC 720
• The Planetary Nebula System and Dynamics in the Outer Halo of NGC 5128
• Geometrical Evidence for Dark Matter: X-ray Constraints on the Mass of the Elliptical Galaxy NGC 720
• A Constant Bar Fraction out to Redshift z~1 in the Advanced Camera for Surveys Field of the Tadpole Galaxy
• Chaos and Mixing in Triaxial Stellar Systems
• Arc Statistics in Triaxial Dark Matter Halos: Testing the Collisionless Cold Dark Matter Paradigm
• The Flattened Dark Halo of Polar Ring Galaxy NGC 4650A: A Conspiracy of Shapes?
• Why Buckling Stellar Bars Weaken in Disk Galaxies
• The Cosmological Dependence of Cluster Density Profiles
• A new criterion for Bar-Forming Instability in Rapidly Rotating Gaseous and Stellar Systems. I. Axisymmetric Form
• The Measurement of Disk Ellipticity in Nearby Spiral Galaxies
• The origin and tidal evolution of cuspy triaxial haloes
• Shapes of dark matter halos
• Dynamical Effects of Nuclear Rings in Disk Galaxies
• Models of Cuspy Triaxial Galaxies
• Formation of cuspy density profiles - a generic feature of collisionless gravitational collapse
• Halo evolution in the presence of a disc bar
• Dark Halo Shapes and the Fate of Stellar Bars
• X-ray Constraints on the Intrinsic Shape of the Lenticular Galaxy NGC 1332
• Galaxy Formation in Triaxial Halos: Black Hole-Bulge-Dark Halo Correlation
• Halo Tracing with Atomic Hydrogen
• Another Flattened Dark Halo: Plar Ring Galaxy A0136-0801

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• Non-Axisymmetric Structure in the Satellite Dwarf Galaxy NGC2976: Implications for its Dark/Bright Mass Distribution and Evolution
• BVRI Surface Photometry of Isolated Spiral Galaxies
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