We present an analysis over 3 different campaigns orientated to follow up the temporal spectra of the PNN NGC 246. Using wavelet analysis, we have found evidences of changes in time scale of hours. Such rapid changes have never been observed before. The temporal spectra of the 2001 dataset present a higher number of modulation frequencies and a

We present very fast radiative transfer tools of interest for the interpretation of future spectroscopic observations taken with the GTC and its post-focus instrumentation. Our radiative transfer codes are based on the iterative methods introduced by Trujillo Bueno & Fabiani Bendicho (1995). Taking into consideration spherical geometry and

OTELO is a survey of emission line objects that will be carried out using tunable filters with OSIRIS at the GTC. The survey will have a deep impact on extragalactic astronomy owing to its large area and its high sensitivity. In this paper we discuss quasar detection within this survey and estimate the number of quasars that can be found in OTELO.

We have developed morphological analysis software for studying galaxies from low to high redshifts. This code is designed to extract quantitative information about the morphology of the different components of galaxies (bulges and disks) imaged with both HST and ground-based observations. We present here some of its possible applications to the GTC

We have developed COSMOPACK, a set of tools that transform images of real galaxies to depict their appearance at a given redshift as observed with a given telescope and camera. The transformation includes K-corrections, change of observing band, repixelation to the scale of the observing system, convolution by the seeing, and noise from sky

We present here a method based on a multi-scale analysis adapted to the ISOCAM data, which offers the possibility to separate the different constituents of the signal and detect sources at the very limit of ISOCAM sensitivity, four orders of magnitude below IRAS. The results obtained with this method, called PRETI (for Pattern REcognition Technique