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The physical origins of the fundamental plane (FP) scaling relations are investigated using large samples of early-type galaxies observed at optical and near-infrared wavelengths. The slope a in the FP relation is shown to increase systematically with wavelength from the U band (j D 0.35 r eff P p 0 a S predictions for this evolution with redshift are described. This model for the underlying physical properties that produce the FP scaling relations provides a comprehensive framework for future investigations of the global properties of early-type galaxies and their evolution.
Pahre et al. (Thu,) studied this question.