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We examine the properties of a morphologically-selected sample of 0.4<z<1.0spheroidal galaxies in the GOODS fields in order to ascertain whether theirincrease in abundance with time arises primarily from mergers. To address thisquestion we determine scaling relations between the dynamical mass determinedfrom stellar velocity dispersions, and the stellar mass determined from opticaland infrared photometry. We exploit these relations across the larger samplefor which we have stellar masses in order to construct the first statisticallyrobust estimate of the evolving dynamical mass function over 0<z<1. The trendsobserved match those seen in the stellar mass functions of Bundy et al. 2005regarding the top-down growth in the abundance of spheroidal galaxies. Byreferencing our dynamical masses to the halo virial mass we compare the growthrate in the abundance of spheroidals to that predicted by the assembly of darkmatter halos. Our comparisons demonstrate that major mergers do not fullyaccount for the appearance of new spheroidals since z~1 and that additionalmechanisms, such as morphological transformations, are required to drive theobserved evolution.

The Mass Assembly History of Spheroidal Galaxies: Did Newly-Formed Systems Arise Via Major Mergers?