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We present a two-pronged approach to the formation of early-type galaxies,using a sample of 18 galaxies at 0.5 < z < 1 from the HST/ACS Ultra Deep Fieldand GRAPES surveys: 1) We combine slitless low resolution spectroscopy from theGRAPES dataset with simple models of galaxy formation to explore their starformation histories. 2) We also perform an analysis of their surface brightnessdistribution with the unprecedented details provided by the ACS superb angularresolution and photometric depth. Our spectroscopic analysis reveals that theirstellar populations are rather homogeneous in age and metallicity and formed atredshifts z ~ 2-5. Evolving them passively, they become practicallyindistinguishable from ellipticals at z = 0. Also, their isophotal shapesappear very similar to those observed for nearby ellipticals, in that thepercentages of disky and boxy galaxies at z ~ 1 are close to the valuesmeasured at z = 0. Moreover,we find that the isophotal structure of z ~ 1early-type galaxies obeys the correlations already observed among nearbyellipticals, i.e. disky ellipticals have generally higher characteristicellipticities, and boxy ellipticals have larger half-light radii and arebrighter in the restframe B band. In this respect then, no significantstructural differences are seen for ellipticals between z = 0 and 1.

The Structure and Star Formation History of Early‐Type Galaxies in the Ultra Deep Field/GRAPES Survey