Age and metallicity gradients in simulated galaxies of the Local Group

MARIONI, ORNELA F.; ABADI, MARIO G

Conferencia; 63 Reunión de la Asociación Argentina de Astronomía; 2021

We present preliminary results regarding the presence of radial and vertical gradients in age and metallicity of simulated Local Group-like galaxies, using the new generation of high-resolution hydrodynamical zoom-in simulations HESTIA (High-resolution Environmental Simulations of The Immediate Area). These set of simulations use observational data, as constraint in their initial conditions, to simulate the local environment. We analyzed the most massive halos of one of these simulations. We studied the metallicity and age distributions of these galaxies and found the presence of vertical and radial gradients. These gradients show that the older and less metallic population have a higher vertical scale, than the younger and more metallic population of stars. The vertical scale increase to the outskirts of the galaxy and this trend is seen for all stellar ages. This kind of gradients is seen also in the Milky Way, analyzing their origin can help us to understand the formation history of our galaxy.