Program: GN-2005A-Q-37

We propose to observe a sample of 3CR radio galaxies and quasars that are known to have conical (or bi-conical) structures of ionized gas related to the AGN of the host galaxy. Some of these structures are large with sizes comparable to the size of the host galaxy and are very luminous in the emission lines. There are several mechanisms that can in principle explain the features of these cones, the two most likely scenarios involve photoionization by UV photons or local shocks. These scenarios are supported by sophisticated theoretical models, which make predictions that can be tested with specific observations. The primary goal of our program is to obtain spectroscopy of the brightest emission lines in a sample of these objects. We will measure the ratio of the key emission lines and compare them with predictions and models from state of art diagnostic diagrams.