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Paper: On the Nature of Fossil Galaxy Groups
Volume: 421, Galaxies in Isolation: Exploring Nature Versus Nurture
Page: 225
Authors: La Barbera, F.; de Carvalho, R. R.; de la Rosa, I. G.; Sorrentino, G.; Gal, R. R.; Kohl-Moreira, J. L.
Abstract: We present a new sample of 25 fossil groups (FGs) at z<0.1. Both the global properties of FGs (e.g. X-ray luminosity) as well as the photometric properties (i.e. isophotal shape parameter, a4) and spectroscopic parameters (e.g. the α-enhancement) of their first-ranked ellipticals are consistent with those of bright ellipticals located in non-fossil systems. This result favors a scenario where FGs are not a distinct class of systems, but rather a common phase in the life of galaxy groups. We also find no evidence for an evolutionary sequence explaining the formation of galaxies in fossil systems through the merging of galaxies in compact groups.
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