Extremely Large Telescopes are very challenging concerning their Adaptive Optics requirements. Their diameters, the specifications demanded by the science for which they are being designed for, and the planned use of Extreme Adaptive Optics systems, imply a huge increment in the number of degrees of freedom in the deformable mirrors. It is

The Canarias InfraRed Camera Experiment (CIRCE) is a near-infrared (1-2.5 μm) instrument for the Gran Telescopio Canarias (GTC) 10.4 m telescope. CIRCE has an off-axis aspheric all-reflective optical system that offers both excellent throughput and image quality. Observational modes include broad/narrow band imaging and low-resolution spectroscopy

We present an astrometric catalogue of positions and proper motions derived from the Carte du Ciel plates of the San Fernando zone, photographic material with a mean epoch 1901.4 with a limiting magnitude V˜15.Digitization has been made using a conventional flatbed scanner. Special techniques have been developed to handle the combination of plate

Long duration gamma ray bursts (GRB's) have been identified as originating in type II SNa explosions, produced during the late stage evolution of massive stars. As the lifetimes of their progenitors are so short the GRB rate per unit (comoving) volume of space, on scales which include significant numbers of galaxies, could be proportional to the

We analyze central surface brightness, nuclear and global colors of intermediate redshift disk galaxies in WFPC2/HST Groth strip and ACS/HST GOODS-N. The aim is to obtain empirical information of relative ages of bulges and disks and to study the relation among surface densities and star formation history of galaxies at 0. 1 z 1. 3. We find that

We present the first results in our study of the bremsstrahlung emission of photons accompanying the spontaneous fission of the 252Cf nucleus. We compare calculations obtained on the basis of our fully quantum model with the experimental data available in literature for photon energies up to about 25 MeV. We find a well agreement between theory and