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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