Schwarzschild models of the Sculptor dSph galaxy
1 Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands
2 Max-Planck-Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany
3 European Organisation for Astronomical Research in the Southern Hemisphere, K. Schwarzschild-Str. 2, 85748 Garching bei München, Germany
a e-mail: firstname.lastname@example.org
We have developed a spherically symmetric dynamical model of a dwarf spheroidal galaxy using the Schwarzschild method. This type of modelling yields constraints both on the total mass distribution (e.g. enclosed mass and scale radius) as well as on the orbital structure of the system modelled (e.g. velocity anisotropy). Therefore not only can we derive the dark matter content of these systems, but also explore possible formation scenarios. Here we present preliminary results for the Sculptor dSph. We find that the mass of Sculptor within 1 kpc is 8.5 × 107±0.05 M๏, its anisotropy profile is tangentially biased and slightly more isotropic near the center. For an NFW profile, the preferred concentration (~15) is compatible with cosmological models. Very cuspy density profiles (steeper than NFW) are strongly disfavoured for Sculptor.
© Owned by the authors, published by EDP Sciences, 2012