Brightest Cluster Galaxy Profile Shapes
Alister Graham, Tod R. Lauer, Matthew Colless, Marc Postman
Abstract
We model the surface brightness profiles of a sample of 119 Abell Brightest Cluster Galaxies (BCG), finding a generalised deVaucouleurs R1/n law, where n is a free parameter, to be appropriate. Departures from the R1/4 law are shown to be a real feature of galaxy profiles, not due to observational errors or coupling of n with the other model parameters. BCG typically have values of n greater than 4. The shape parameter n is shown to correlate with effective half-light radius, such that the larger BCG have larger values of n. This continues a trend noticed amongst ordinary elliptical galaxies and dwarf ellipticals, such that the fainter galaxies have smaller values of n.
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