Colloquia

Ricardo Demarco : Early-type galaxy formation: understanding the role of the environment

One of the most characteristic features of galaxy clusters is the so-called “red sequence” (RS) that early-type galaxies form in the color-magnitude space of filters chosen to straddle the rest-frame 4000 A-break feature in galaxy spectra. Since these galaxies are, in general, devoid of gas and dust, their red colors are mainly a consequence of their passive nature. The denser cluster core is dominated by these “red-and-dead” galaxies, some of them the most massive galaxies known. However, the physical mechanisms responsible for quenching their star formation, thus originating the RS, are poorly understood. Environmental effects should play a significant role in the formation of the RS by transforming the observed galaxy properties from late to early-type ones. However, the details of how this actually happens are still unclear. I will present part of the work in progress that our team at UdeC is carrying out to better understand whether nature or nurture dominates in the formation of the RS. In this respect, I will briefly present our KMOS program aimed at studying the kinematical structure of cluster galaxies at 0.8

Lugar :
Instituto de Astronomia

Fecha:
27 de Junio

Hora:
16:00 horas