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We present the data processing and analysis techniques we are using todetermine structural and photometric properties of galaxies in our Gemini/HSTGalaxy Cluster Project sample. The goal of this study is to understand clustergalaxy evolution in terms of scaling relations and structural properties ofcluster galaxies at redshifts 0.15 < z < 1.0. To derive parameters such astotal magnitude, half-light radius, effective surface brightness, and Sersic n,we fit r^{1/4} law and Sersic function 2-D surface brightness profiles to eachof the galaxies in our sample. Using simulated galaxies, we test how theassumed profile affects the derived parameters and how the uncertainties affectour Fundamental Plane results. We find that while fitting galaxies which haveSersic index n < 4 with r^{1/4} law profiles systematically overestimates thegalaxy radius and flux, the combination of profile parameters that enter theFundamental Plane has uncertainties that are small. Average systematic offsetsand associated random uncertainties in magnitude and log r_e for n > 2 galaxiesfitted with r^{1/4} law profiles are -0.1+-0.3 and 0.1+-0.2 respectively. Thecombination of effective radius and surface brightness, log r_e - \beta log<I>_e, that enters the Fundamental Plane produces offsets smaller than-0.02+-0.10. This systematic error is insignificant and independent of galaxymagnitude or size. A catalog of photometry and surface brightness profileparameters is presented for three of the clusters in our sample, RXJ0142.0+2131, RX J0152.7-1357, and RX J1226.9+3332 at redshifts 0.28, 0.83, and0.89 respectively.

The Gemini/HST Cluster Project: Structural and Photometric Properties of Galaxies in Three z =0.28-0.89 Clusters