Las poblaciones estelares en el centro de las galaxias han sido estudiadas en detalle. Por el contrario, más allá del radio efectivo (definido como aquel que contiene la mitad de la luz de la galaxia), sus propiedades son prácticamente desconocidas. Estas regiones externas son, sin embargo, cruciales para entender tanto la época como el mecanismo

Space-based detectors for the study of extreme energy cosmic rays (EECR) are being prepared as a promising new method for detecting highest energy cosmic rays. A pioneering space device - the "tracking ultraviolet set-up" (TUS) - is in the last stage of its construction and testing. The TUS detector will collect preliminary data on EECR in the

A search for a charged Higgs boson is performed with a data sample corresponding to an integrated luminosity of 19.7 ± 0.5 fb-1 collected with the CMS detector in proton-proton collisions at √{s}=8 ,TeV. The charged Higgs boson is searched for in top quark decays for m H± m t - m b, and in the direct production pp → t(b)H± for m H± > m t - m b

The main goal of the JEM-EUSO experiment is the study of Ultra High Energy Cosmic Rays (UHECR, 1019-1021 e V), but the method which will be used (detection of the secondary light emissions induced by cosmic rays in the atmosphere) allows to study other luminous phenomena. The UHECRs will be detected through the measurement of the emission in the

Context. Accurate star formation histories (SFHs) of galaxies are fundamental for understanding the build-up of their stellar content. However, the most accurate SFHs - those obtained from colour-magnitude diagrams (CMDs) of resolved stars reaching the oldest main-sequence turnoffs (oMSTO) - are presently limited to a few systems in the Local Group

The main goal of this thesis is the study of the generation and transfer of polarized radiation in several spectral lines whose diagnostic potential has not been thoroughly investigated before. We aim at developing and applying reliable plasma diagnostic techniques, based on numerical radiative transfer calculations using realistic atomic and