Revisiting the Colour-Magnitude Diagram of Elliptical Galaxies in Cosmological Context

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

Córdoba

Workshop; IX Friends of Fiends meeting 2019; 2019

We analyze the colour-magnitude diagram (CMD) of elliptical galaxies in cosmological context, exploringsecondary dependences of the color-magnitude relation (CMR) on different galaxy properties such asstellar masses, ages, chemical abundances and metallicities. The location of observed early-type galaxies in this diagram is compared with that of z=0 simulated elliptical galaxies. A detailed comparison betweensimulated and observed trends of the diagram as function of different galaxy properties is carried out. Our results indicate that stellar and halo masses are key parameters for determining the CMR, while stellar age constitutes an important source of scatter around the CMR. We discuss about how to use the observed CMD to obtain information about the evolutionary history of galaxies by means of cosmological simulations.