Brightest Cluster Galaxy Profile Shapes

Details Brightest Cluster Galaxy Profile Shapes Brightest Cluster Galaxy Profile Shapes

1996-03-04

arxiv.org/abs/astro-ph/9603006v1

Astrophys.J.465:534-547,1996

Astronomy and Astrophysics

Astrophysics

To appear in Ap.J., 16 pages

Scientific paper

10.1086/177440

We model the surface brightness profiles of a sample of 119 Abell Brightest Cluster Galaxies (BCG), finding a generalised deVaucouleurs R^{1/n} law, where n is a free parameter, to be appropriate. Departures from the R^{1/4} 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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