We have investigated the properties of the diffuse light in the Virgo Cluster core region, based on the detection of intracluster planetary nebulae (PNs) in four fields. We eliminate the bias from misclassified faint continuum objects, using improved Monte Carlo simulations, and the contaminations by high-redshift Lyα galaxies, using the Lyα

We present a study of outflow (OF) and broad absorption line (BAL) systems in Mrk 231, and in similar infrared (IR) quasi-stellar objects (QSOs). This study is based mainly on one-dimensional and two-dimensional spectroscopy (obtained at La Palma/William Herschel Telescope, Hubble Space Telescope, International Ultraviolet Explorer, European

Los starbursts son eventos en los que se forman más de de 10e4 Msol de estrellas a un elevado ritmo en un área muy pequeña. La consecuencia final de algunos starbursts es la expulsión de todo el material procesado hacia fuera de la galaxia por medio de los llamados supervientos galácticos (SVG). En esta tesis se estudian tres casos de galaxias

Esta tesis trata diversos aspectos de relacionados con el estudio de la todavía poco conocida fase de transición comprendida entre la Rama Asintótica de Gigantes y el estado de Nebulosa Planetaria. Para ello, hemos analizado varios tipos de objetos en esta corta fase evolutiva, incluyendo estrellas AGB/post-AGB y proto-nebulosas planetarias

The theory of the generation and transfer of polarized radiation, mainly developed for interpreting solar spectropolarimetric observations, allows us to reconsider, in a more rigorous and elegant way, a physical mechanism that has been suggested some years ago to interpret the high degree of polarization often observed in astronomical masers. This

We present Spitzer Space Telescope infrared photometric time series of the transiting extrasolar planet system TrES-1. The data span a predicted time of secondary eclipse, corresponding to the passage of the planet behind the star. In both bands of our observations, we detect a flux decrement with a timing, amplitude, and duration as predicted by