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2009MNRAS.397.1816P - Mon. Not. R. Astron. Soc., 397, 1816-1835 (2009/August-3)
The HST/ACS Coma cluster survey - V. Compact stellar systems in the Coma cluster.
PRICE J., PHILLIPPS S., HUXOR A., TRENTHAM N., FERGUSON H.C., MARZKE R.O., HORNSCHEMEIER A., GOUDFROOIJ P., HAMMER D., TULLY R.B., CHIBOUCAS K., SMITH R.J., CARTER D., MERRITT D., BALCELLS M., ERWIN P. and PUZIA T.H.
Abstract (from CDS):
We find that all seven compact galaxies require a two-component fit to their light profile and have measured velocity dispersions that exceed those expected for typical early-type galaxies at their luminosity. From our structural parameter analysis, we conclude that three of the samples should be classified as compact ellipticals or M32-like galaxies, and the remaining four being less extreme systems. The three compact ellipticals are all found to have old luminosity weighted ages (≳12 Gyr), intermediate metallicities (-0.6 < [Fe/H] < -0.1) and high [Mg/Fe] (≳0.25).
Our findings support a tidal stripping scenario as the formation mode of compact galaxies covering the luminosity range studied here. We speculate that at least two early-type morphologies may serve as the progenitor of compact galaxies in clusters.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): surveys - galaxies: clusters: individual: Coma - galaxies: dwarf - galaxies: structure
Nomenclature: Table 1: [PPH2009b] CcGVNNa (Nos 1, 9a-9b, 12, 18, 19a-19b).
Simbad objects: 32
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