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20 April 2024
 
  » arxiv » astro-ph/0109492

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The Extended Shapes of Galactic Satellites
S. R. Majewski ; A. D. Forestell ; J. C. Ostheimer ; C. Palma ; M. H. Siegel ; S. Sohn ; K. B. Westfall ; R. J. Patterson ; P. M. Frinchaboy ; R. Link ;
Date 26 Sep 2001
Subject astro-ph
AbstractWe are exploring the extended stellar distributions of Galactic satellite galaxies and globular clusters. For seven objects studied thus far, the observed profile departs from a King function at large r, revealing a ``break population’’ of stars. In our sample, the relative density of the ``break’’ correlates to the inferred M/L of these objects. We discuss opposing hypotheses for this trend: (1) Higher M/L objects harbor more extended dark matter halos that support secondary, bound, stellar ``halos’’. (2) The extended populations around dwarf spheroidals (and some clusters) consist of unbound, extratidal debris from their parent objects, which are undergoing various degrees of tidal disruption. In this scenario, higher M/L ratios reflect higher degrees of virial non-equilibrium in the parent objects, thus invalidating a precept underlying the use of core radial velocities to obtain masses.
Source arXiv, astro-ph/0109492
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