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Microlensing events and old stellar populations around the galactic centre
(Universidad Andrés Bello, 2021) Navarro, María Gabriela; Capuzzo-Dolcetta, Roberto; Facultad de Ciencias Exactas
Among the most critical unknowns in astrophysics concern understanding the nature of galaxies. Galactic formation, structure, and evolution have been studied for several years, using observations, which are improving in quality with the new generation of telescopes, and computational methods that implement sophisticated models to reproduce what we observe. However, we have not yet been able to fully understand the characteristics of spiral galaxies, such as the Milky Way. In this context, we consider two independent indicators. Microlensing events: caused by a partial alignment between point-like objects. Their purely geometrical nature reveals the structure and dynamics of stellar systems. And RR Lyrae stars; distance indicators and tracers of old and metal-poor stellar populations. They are versatile objects to study the formation and 3D structure of stellar systems. Using the near-IR observations with the VISTA Variables in the Vía Láctea Survey (VVV), we examine the populations located in the reddened areas surrounding the Galactic center and at low latitudes of the Galactic bulge. We compare the observations with theoretical studies of Galactic formation to understand the functioning of the Milky Way, from its origin to how we currently observe it.