AAO Colloquium.

THURSDAY, 20th July - 3:30pm, AAO Conference Room

The LARC Survey and photometric comparison to the APM

Kevin Pimbblet

University of Durham

The LARC (Las Campanas and AAT Rich Cluster) Survey is a large, long term project to study a statistically reliable sample of the richest clusters in the southern hemisphere in a redshift slice between z=0.07-0.15. Objectives of the Survey are outlined and target selection examined. The observations made on the LCO, AAT, XMM and ROSAT are summarized and the data reduction pipeline is explained. The overlap area between the survey and the APM is photometrically analyzed (Pimbblet et al. 2000. in prep). Using the superior star-galaxy separation of LARCS, it is shown that the APM (and hence the GRS input catalogue) systematically misses out galaxies. The properties of the missing population are discussed. Future work directions will also be highlighted.