The two Fanaroff & Riley classes of radio galaxies are defined by radio morphology, and the distinction may arise from a combination of environmental conditions and central engine power. Several studies have suggested that powerful, FR II, radio galaxies are on average 0.5 mag fainter optically (i.e., are smaller) than weak, FR I, radio galaxies

The behavior of the light curve of 3C 345 is analyzed using all B magnitudes available in the literature, thus extending the number of points in the compiled light curve of this object by a factor of more than 50 percent and the coverage by about 7 yrs, in comparison with the light curve compiled by Kidger and Beckman (1986). In addition, a new and

OSIRIS (Optical System for Imaging and low Resolution Integrated Spectroscopy) is the optical Day one instrument for the GTC and the only Spanish Day One instrument. With both instrument and telescope schedules matched, OSIRIS will be available as soon as the GTC is scientifically operational. In this contribution an overview of the instrument at

OTELO, (OSIRIS Tunable Emission Line Object Survey), will survey emission line objects using OSIRIS tunable filters in selected atmospheric windows relatively free of sky emission lines. Different high latitude and low extinction sky regions with enough angular separations will be observed yielding a total area of 1-2 square degrees. A 5 σ depth of

We present high and low resolution spectroscopy and narrow-band imaging of the unusual bipolar outflow source NGC 6537. As a consequence, we are able for the first time to construct large scale velocity maps of this source; note the presence of strongly variable core outflow densities, rising to a peak value n_e_~1.7x10^4^cm^-3^; find evidence for

The Photodetector Array Camera and Spectrometer (PACS) is one of the three science instruments for ESA's far infrared and submillimetre observatory Herschel. In its photometry mode, it will simultaneously image two bands, 60-85 or 85-130μ m and 130-210μ m, over a field of view of ˜ 1.75'× 3.5', with full beam sampling in each band. In spectroscopy