In this work, we study the formation and evolution of dark matter haloes by means of the spherical infalling model with shell-crossing. We present a framework to tackle this effect properly based on the numerical follow-up, with time, of that individual shell of matter that contains always the same fraction of mass with respect to the total mass

OSIRIS is the Spanish Day One instrument for the GTC 10.4-m telescope. OSIRIS is a general purpose instrument for imaging, low-resolution long slit and multi-object spectroscopy (MOS). OSIRIS has a field of view of 8.6×8.6 arcminutes, which makes it ideal for deep surveys, and operates in the optical wavelength range from 365 through 1000nm. The

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We present here the results of a survey searching for current-star forming galaxies at at z ˜ 0.83. Objects are selected by their emission in the Hα line through the narrow band filter technique.

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As part of the GTC Control System (GCS) a data processing package is being developed. We will describe the perfomance of the Data Processing Kit (DPK), using real data obtained during the preliminary tests made prior to the commissioning of the GTC (both with a Refractor and the Acquisition and Guiding Camera). Some examples of the versatility of