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Article overview
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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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