The Dark Matter Density Profile Of The Fornax Dwarf
Abstract
We construct axisymmetric Schwarzschild models to measure the mass profile of the Local Group dwarf galaxy Fornax. These models require no assumptions to be made about the orbital anisotropy of the stars, as is the case for commonly used Jeans models. We test a variety of parameterizations of dark matter density profiles and find cored models with uniform density rho c = (1.6 +/- 0.1) x 10(-2) M-circle dot pc(-3) fit significantly better than the cuspy halos predicted by cold dark matter simulations. We also construct models with an intermediate-mass black hole, but are unable to make a detection. We place a 1 sigma upper limit on the mass of a potential intermediate-mass black hole at M. <= 3.2 x 10(4) M-circle dot.
Department
Subject
dark matter
galaxies<colfamily> : dwarf
galaxies<colfamily> :
individual (fornax)
galaxies<colfamily> : kinematics and dynamics
local group
black-hole mass
axisymmetrical dynamical models
milky-way satellites
early-type galaxies
to-light ratio
spheroidal galaxies
proper
motions
spiral galaxies
halos
kinematics
astronomy & astrophysics
galaxies<colfamily> : dwarf
galaxies<colfamily> :
individual (fornax)
galaxies<colfamily> : kinematics and dynamics
local group
black-hole mass
axisymmetrical dynamical models
milky-way satellites
early-type galaxies
to-light ratio
spheroidal galaxies
proper
motions
spiral galaxies
halos
kinematics
astronomy & astrophysics
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