In the last five years there has been cumulative evidence showing that massivegalaxies have dramatically grown in size since z ˜ 3. This result hasremained very controversial as it seems at odd with our previous knowledgebased on the detailed analysis of the stellar populations of nearby massivegalaxies which shows that their stars were form very

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A magnetic field modifies the properties of waves in a complex way. Significant advances have been made recently in our understanding of the physics of sunspot waves with the help of high-resolution observations, analytical theories, as well as numerical simulations. We review the current ideas in the field, providing the most coherent picture of

The OTELO project is the extragalactic survey currently under way using the tunable filters of theinstrument OSIRIS at the GTC. OTELO is providing the deepest emission line object survey of the universe up to a redshift 7. In this contribution, the first images will be shown together with some preliminary results.

The Groth field is one of the sky regions that will be targeted by the OSIRIS Tunable Filter Emission Line Object survey in the optical 820 nm and 920 nm atmospheric windows. In the present paper, public Chandra X-ray data with total exposure time of 200 ks are analyzed and combined with optical broadband data of the Groth field, in order to study