The accretion of the intergalactic medium onto the gaseous disc is used to explain the generation of galactic warps. A cup-shaped distortion is expected, due to the transmission of the linear momentum; but, this effect is small for most incident inflow angles and the predominant effect turns out to be the transmission of angular momentum, i.e. a

After presenting three ways of defining a bulge component in disk galaxies, we introduce the various types of bulges, namely the classical bulges, the boxy/peanut bulges and the disk-like bulges. We then discuss three specific topics linked to bulge formation and evolution, namely the coupled time evolution of the bar, buckling, and peanut

We present two-dimensional Fabry-Perot observations of the emission-line distribution and kinematics in nearby spiral galaxies. We have developed and demonstrated the utility of a number of analysis tools which have general applicability, but which we have, so far, applied to only one galaxy (M74, Fathi et al. 2007). In this galaxy, we have found

La formación de flujos y nebulosas bipolares es un fenómeno muy común en el Universo, aunque aún se comprenden bastante mal los mecanismos físicos responsables. Un tipo particularmente interesante de objetos que producen flujos bipolares son las estrellas simbióticas. Estas estrellas son sistemas binarios en interacción, con una gigante roja

Structural analysis of S0-Sbc galaxies imaged with HST at near-infrared wavelengths shows many nuclei to be flattened systems with surface brightness comparable to that of the spheroidal bulge component. While standard photometric decomposition would assign that light to the bulge component, its flattened shape and disky isophotes argue for

Ultra-compact nuclear rings (UCNRs) are ring-shaped star-forming regions around galactic nuclei that range in radius from a few to 200 pc. Only a handful are known in the literature, but thanks to the high resolution of HST, we are now able to study their frequency and properties in detail. We have discovered UCNRs in three nearby galaxies. In NGC