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Date and Time of the Query: 2019-04-19 T19:23:01 PDT
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For refcode 2001ApJ...559..791C:
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Copyright by American Astronomical Society. Reproduced by permission
2001ApJ...559..791C Galaxy Populations and Evolution in Clusters. I. Dynamics and the Origin of Low-Mass Galaxies in the Virgo Cluster Christopher J. Conselice, and John S. Gallagher III Department of Astronomy, University of Wisconsin, Madison and Rosemary F. G. Wyse Department of Physics and Astronomy, The Johns Hopkins University Received 2000 November 20; accepted 2001 June 1 ABSTRACT Early-type dwarfs are the most common galaxy in the local universe, yet their origin and evolution remain a mystery. Various cosmological scenarios predict that dwarf-like galaxies in dense areas are the first to form and hence should be the oldest stellar systems in clusters. By using radial velocities of early-type dwarfs in the Virgo cluster we demonstrate that these galaxies are not an old cluster population but have signatures of production from the infall of field galaxies. Evidence of this includes the combined large dispersions and substructure in spatial and kinematic distributions for Virgo early-type dwarfs and a velocity dispersion ratio with giant ellipticals expected for virialized and accreted populations. We also argue that these galaxies cannot originate from accreted field dwarfs, but must have physically evolved from a precursor population, of different morphology, that fell into Virgo some time in the past. Subject headings: galaxies: dwarf - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: formation - galaxies: star clusters
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