Small scatter and nearly-isothermal mass profiles to four half-light radii from two-dimensional stellar dynamics of early-type galaxies

@article{Cappellari2015SmallSA,
  title={Small scatter and nearly-isothermal mass profiles to four half-light radii from two-dimensional stellar dynamics of early-type galaxies},
  author={Michele Cappellari and Aaron J. Romanowsky and Jean P. Brodie and Duncan A. Forbes and Jay Strader and Caroline Foster and Sreeja S. Kartha and Nicola Pastorello and Vincenzo Pota and Lee R. Spitler and Christopher Usher and Jacob A. Arnold},
  journal={arXiv: Astrophysics of Galaxies},
  year={2015}
}
We study the total mass-density profile for a sample of 14 fast-rotator early-type galaxies (stellar masses $10.2<\log M_\ast/M_\odot<11.7$). We combine observations from the SLUGGS and Atlas3D surveys to map out the stellar kinematics in two-dimensions, out to a median radius for the sample of four half-light radii $R_e$ (or 10 kpc), and a maximum radius of 2.0-6.2 $R_e$ (or 4-21 kpc). We use axisymmetric dynamical models based on the Jeans equations, which allow for a spatially varying… 

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