Revisiting the colour-magnitude diagram of elliptical galaxies in cosmological context

ZENOCRATTI, LUCAS JESÚS; DE ROSSI, MARÍA EMILIA; SMITH CASTELLI, ANALÍA VIVIANA; FAIFER, FAVIO RAUL

Córdoba

Congreso; 9th Friends-of-Friends Meeting; 2019

Instituto de Astronomía Teórica y Experimental (IATE)

We analyze the colour-magnitude diagram (CMD) of elliptical galaxies in cosmological context, exploring secondary dependences of the color-magnitude relation (CMR) on different galaxy properties such as stellar 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 between simulated 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.