Self-consistent massive disks in triaxial dark matter halos

Abstract

Galactic disks in triaxial dark matter halos become deformed by the elliptical potential in the plane of the disk in such a way as to counteract the halo ellipticity. We develop a technique to calculate the equilibrium configuration of such a disk in the combined disk-halo potential, which is based on the method of Jog (2000) but accounts for the radial variation in both the halo potential and the disk ellipticity. This crucial ingredient results in qualitatively different behavior of the disk: the disk circularizes the potential at small radii, even for a reasonably low disk mass. This effect has important implications for proposals to reconcile cuspy halo density profiles with low surface brightness galaxy rotation curves using halo triaxiality. The disk ellipticities in our models are consistent with observational estimates based on two-dimensional velocity fields and isophotal axis ratios.

ApJ, in press

References in corpus (18)

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Cited by in corpus (19)

• The Core-Cusp Problem
• The Sagittarius Dwarf Galaxy: a Model for Evolution in a Triaxial Milky Way Halo
• Evidence for a Triaxial Milky Way Dark Matter Halo from the Sagittarius Stellar Tidal Stream
• The Discovery of Ellipsoidal Variations in the Kepler Light Curve of HAT-P-7
• Lopsided Spiral Galaxies
• Recovering cores and cusps in dark matter haloes using mock velocity field observations
• Constraining the NFW Potential with Observations and Modeling of LSB Galaxy Velocity Fields
• On the Origin of Lopsidedness in Galaxies as Determined from the Spitzer Survey of Stellar Structure in Galaxies (S4G)
• Cosmology: small scale issues revisited
• Quantifying Non-circular Streaming Motions in Disc Galaxies
• The SAMI Galaxy Survey: the intrinsic shape of kinematically selected galaxies
• Mapping the allowed parameter space for decaying dark matter models
• Loss of halo triaxiality due to bar formation
• Non-Axisymmetric Structure in the Satellite Dwarf Galaxy NGC2976: Implications for its Dark/Bright Mass Distribution and Evolution
• Galaxy Concentrations are Trimodal
• Dynamical Models for Disk Galaxies with Triaxial Halos
• Order and chaos in a new 3D dynamical model describing motion in non axially symmetric galaxies
• Off-centred dark matter halo leading to strong central disc lopsidedness
• Order and chaos in a three dimensional galaxy model