Propiedades de discos y esferoides en las simulaciones ILLUSTRIS-TNG y EAGLE

Galaxies are complex self-gravitating systems formed by the overlapping of various stellar components such as the disk, nucleus, bar, and stellar halo. To achieve a complete insight into the formation and evolution of galaxies, it is essential the study and characterization of the intrinsic physical properties of each stellar component overlapped spatially and temporally. In this work, a sample of the order of 2000 galaxies, with star masses similar to the Milky Way log(M_*/M_⊙)∼10.5, is dynamically decomposed. These galaxies belong to the ILLUSTRIS-TNG and EAGLE cosmological hydrodynamic simulations. A discoidal and a spheroidal stellar component are identified, and the mass fractions are compared with observational results. The results show a good agreement in general. However, simulations in the ΛCDM model are not able to reproduce in detail the properties of disks and spheroids, pointing to the need for substantial improvements in astrophysical modeling.