The colour-magnitude relation of simulated early-type galaxies as a function of their kinematics

ZENOCRATTI, L. J.; FAIFER, F. R.; SMITH CASTELLI, A. V.; DE ROSSI, M. E.

Rosario

Congreso; 62 reunión Anual de la AAA; 2020

Universidad Nacional de Rosario

Early-type (both elliptical and lenticular) galaxies define the well-known red sequence or colour-magnitude relation (CMR) in the colour-magnitude diagram (CMD). In this work, we present results of the study of that relation at different redshifts z in cosmological numerical simulations. In particular, we explore its evolution from z=2 to z=0, selecting a sample of simulated objects that display properties observed in early-type galaxies of the Local Universe. We take into account the average rotation (or lack of it) that they exhibit, in order to determine if the stellar kinematics of such objects correlate with their position in the diagram and with other properties. Evolution of fast- and slow-rotators over the CMD at different redshifts and changes in their relevant properties and kinematical behaviour is also analysed. Results shown here are part of a project aimed at identifying the processes that originated the CMR at z=0, performing a comprehensive comparison between simulated and observed early-ty pe galaxies.