We propose to perform deep narrow band imaging in several emission lines of interest for a sample of blue compact dwarf galaxies at the GTC, with the OSIRIS facility in tunable filter mode. From the emission line maps, we will determine the physical properties of the diffuse ionized gas and disentangle the nature of the ionizing source.

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The Gran Telescopio Canarias (GTC), a 10 meter segmented-mirror telescope, now at an advanced stage of construction on La Palma (Spain), will shortly be entering its integration phase. First light is planned for the second half of 2003, with science operations scheduled for the end of 2004. This represents a small delay against the originally

The global properties of early-type galaxies are fairly well described through a linear relation (the Fundamental Plane, FP [2],[3]) in the space defined by three observables: the effective radius r e, the average surface brightness μ_e and the central velocity dispersion σ_c. The FP has been shown to be close to the plane defining the virial

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