In nature there are groups and clusters of galaxies that present a large difference in luminosity between their two brightest members. These galaxy aggregations are called fossils and they host the most luminous and massive galaxies in the Universe. How did fossil systems form? Which are the mechanisms driving their evolution? Which are the

The different evolutionary paths followed by the galaxies along their lives are expected to leave an imprint in their sizes. Nevertheless, observationally the role that the environment plays on shaping the galaxies is still unclear. Taking advantage of the great statistics provided by SDSS data, we address this question using a mass-complete sample

We are presenting the results from observations carried out at La Palma with the Nordic Optical Telescope, focused on studying the microvariability of obscured type 2 quasars. We investigate the connection between the microvariable events and the morphology of the studied targets. We also present a the detailed study of the techniques concerning

In this poster we present three developments related to the Galactic O-Star Spectroscopic Survey (http://adsabs.harvard.edu/abs/2011hsa6.conf..467M{GOSSS}). First, we are making public the first version of MGB, an IDL code that allows the user to compare oberved spectra to a grid of spectroscopic standards to measure spectral types, luminosity

MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is the future intermediate-resolution optical Integral-Field Unit (IFU) and Multi-Object Spectrograph (MOS) of the 10.4m GTC telescope. The instrument can be used to observe either a contiguous (100% filling factor) field-of-view of 12.5×11.3 arcsec^{2} or 92 objects anywhere in

The Milky Way is expected to contain a large number of young massive (few x 1000 solar masses) stellar clusters, borne in dense cores of gas and dust. Yet, their known number remains small. We have started a programme to search for such clusters, MASGOMAS (MAssive Stars in Galactic Obscured MAssive clusterS). Initially, we selected promising