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**Session 11 - Elliptical Galaxies.**

*Display session, Monday, June 10*

*Great Hall, *

## [11.02] Brightest Cluster Galaxy Profile Shapes

*A. Graham (MSSSO), T. R. Lauer (KPNO), M. Colless (MSSSO), M. Postman (STScI)*
We model the surface brightness profiles of an observed 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.
BCG typically have values of n greater than 4.
The shape parameter n is shown to correlate with effective half-light
radius, r_e, 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 brighter galaxies have larger values of n.
Departures from the r^1/4 law are found to be a real feature of galaxy
profiles, not due to observational errors or coupling of n with the other
model parameters.

**Program
listing for Monday**