Abstract
ABSTRACT One of the main difficulties in extending the Hubble diagram to great distances is related to the problem of bias in selecting candidate objects for spectroscopic or photometric study. A report is presented on a continuing optical study of 3CR radio galaxies. The faint, presumably distant 3CR sources all have very high radio luminosities, and this property correlates with the long-known propensity of the central optical galaxy to show strong (nuclear) emission lines. The considered faint radio galaxies have very large emission-line equivalent widths, which represents an enormous aid to a 'safe' redshift determination. Attention is given to emission-line properties, some physical inferences from the emission lines, and some overall properties of the radio galaxies.
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