Esta tesis presenta el análisis de dos galaxias esferoidales de la Vía Láctea (VL): Sextans y Sculptor. La metodología seguida en ambos los casos es la misma y ha dado lugar a resultados científicos notables que se han publicado en revistas científicas arbitradas. El ingrediente básico para este análisis está dado por la historia de formación

Context. Claims of an X-shaped Galactic bulge were based on the assumption of red clump stars as standard candles in some lines of sight crossing the off-plane bulge. However, some doubts have been cast on whether the two peaks in star counts along the line of sight really represent a double peak in the density distribution, or whether there is

We explore scenarios for reionizing the intergalactic medium with low galaxy ionizing photon escape fractions. We combine simulation-based halo mass–dependent escape fractions with an extrapolation of the observed galaxy rest-ultraviolet luminosity functions to solve for the reionization history from z = 20\to 4. We explore the posterior

Using samples drawn from the Sloan Digital Sky Survey, we study for the first time the relation between large-scale environments (clusters, groups, and voids) and the stellar initial mass function (IMF). We perform an observational approach based on the comparison of IMF-sensitive indices of quiescent galaxies with similar mass in varying

We present a catalog of compact double radio galaxies (hereafter COMP2CAT) listing 43 edge-brightened radio sources whose projected linear size does not exceed 60 kpc, the typical size of their host galaxies. This is the fifth in a series of radio source catalogs recently created, namely: FRICAT, FRIICAT, FR0CAT, and WATCAT, each of which focuses

Uno de los principales mecanismos de formación de discos es la acreción de gas desde el medio intergaláctico (IGM; también llamada cold-flow). El gas acretado alimenta y es responsable de la formación estelar en las galaxias. La necesidad de este suministro de gas externo es evidente en las simulaciones numéricas, sin embargo, ha sido bastante