Faint Identifications of ``1 Jansky'' Radio Source Empty Fields: Radio Galaxies at High Redshift

New optical identifications are reported for 10 of 11 1 Jansky radio sources that were previously unidentified to r < 23.5. Broad-band VIJK photometry suggests that these are relatively quiescent radio galaxies at high redshift, z > 1. The new identifications allow for the first time comparisons between essentially complete samples of 3C and 1 Jansky radio galaxies at high redshift that are unbiased by optical selection criteria. It is shown that the amount of extended ultraviolet activity, presumed to be star formation, in high-redshift radio galaxies is correlated with the steepness of the low-frequency radio spectrum and with the degree of high-frequency spectral curvature, but not with the radio luminosity. These correlations further emphasize the intimate association of the star formation with the radio activity. It is shown that the rest-frame visual luminosities of the radio galaxies remain remarkably uniform out to z ~ 2, despite large variations in the radio luminosities and in the strength of the star-formation activity, and it is argued that this is most easily understood if most of the light comes from an old underlying population of stars that formed a few billion years prior to the epoch of observation. This supports the detailed analysis of the spectral energy distribution of one of this sample at z = 3.395 reported elsewhere.