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    The Dark Matter Density Profile Of The Fornax Dwarf

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    2012_02_darkmatter.pdf (490.8Kb)
    Date
    2012-02
    Author
    Jardel, John R.
    Gebhardt, Karl
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    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
    Astronomy
    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
    URI
    http://hdl.handle.net/2152/35113
    Citation
    Jardel, John R., and Karl Gebhardt. "The dark matter density profile of the Fornax dwarf." The Astrophysical Journal, Vol. 746, No. 1 (Feb., 2012): 89.
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