Kinematics of Milky Way Satellites in a Lambda Cold Dark Matter Universe

Abstract

We investigate whether the subhalos of Lambda-CDM galaxy halos have potentials consistent with the observed properties of Milky Way satellites, particularly those with high-quality photometric and kinematic data: Fornax, Leo I, Sculptor, Sextans, and Carina. We compare spherical models with isotropic velocity dispersion tensors to the observed, circularly averaged star counts, line-of-sight velocity dispersion profiles and line-of-sight velocity distributions. We identify subhalos within the six high-resolution dark matter halos of the Aquarius Project for which the spherically averaged potentials result in excellent fits to each of the five galaxies. In particular, our simple one-integral models reproduce the observations in the inner regions, proving that these data are fully consistent with Lambda-CDM expectations and do not require cored dark matter distributions. For four of the five satellites the fits require moderately cusped {\it stellar} density profiles. The star count data for Leo I, however, do require a cored distribution of star counts. Current data suggest that these five satellites may be hosted by Lambda-CDM subhalos with maximum circular velocities in the range 10 to 30 km/s.

9 pages, 5 figures

References in corpus (18)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• A Universal Mass Profile for Dwarf Spheroidal Galaxies?
• A common mass scale for satellite galaxies of the Milky Way
• The Observed properties of Dark Matter on small spatial scales
• The kinematic status and mass content of the Sculptor dwarf spheroidal galaxy
• Velocity Dispersion Profiles of Seven Dwarf Spheroidal Galaxies
• Does the Fornax dwarf spheroidal have a central cusp or core?
• The Velocity Dispersion Profile of the Remote Dwarf Spheroidal Galaxy Leo I: A Tidal Hit and Run?
• The Cold Dark Matter Halos of Local Group Dwarf Spheroidals
• Exploring Halo Substructure with Giant Stars XI: The Tidal Tails of the Carina Dwarf Spheroidal and the Discovery of Magellanic Cloud Stars in the Carina Foreground
• The mass and velocity anisotropy of the Carina, Fornax, Sculptor and Sextans dwarf spheroidal galaxies
• Clean Kinematic Samples in Dwarf Spheroidals: An Algorithm for Evaluating Membership and Estimating Distribution Parameters When Contamination is Present
• Mass modelling of dwarf spheroidal galaxies: the effect of unbound stars from tidal tails and the Milky Way
• On the nature of the Milky Way satellites
• Cores and Cusps in the Dwarf Spheroidals
• The origin of failed subhaloes and the common mass scale of the Milky Way satellite galaxies
• Determining the Nature of Dark Matter with Astrometry
• Improved photometry of SDSS crowded field images: Structure and dark matter content in the dwarf spheroidal galaxy Leo I

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• A Robust Determination of Milky Way Satellite Properties using Hierarchical Mass Modeling
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• Probabilistic distributions of $M/L$ values for ultra-faint dwarf spheroidal galaxies: stochastic samplings of the IMF
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• An analytic distribution function for a massless cored stellar system in a cuspy dark matter halo
• Estimating the evolution of gas in the Fornax dwarf spheroidal galaxy from its star formation history: an illustrative example
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