Individual features of note in the 4C USS are: the new radio galaxy 4C60.07, the close pair of USS sources 4C26.38N and 4C26.38S, the extraordinarily large 4C23.56 and its giant bipolar emission line nebula, the highly asymmetric 4C48.48, the "S" curved 4C28.58, and the two compact doubles 4C40.36 and 4C24.28.
It is important to appreciate the existence of very large sources like 4C23.56 and diffuse sources like 4C48.48 in light of the observational and self-imposed biases against finding and identifying such sources at high redshift. The USS samples of Rottgering et al. 1994 purposefully excluded large objects (and diffuse objects) from their sample.
Follow-up observations of the objects presented here that would be particularly valuable are VLA full synthesis maps at 3.6 cm, submillimeter detection (and possibly spatial resolution of) the thermal component with SCUBA, HST high resolution imaging and adaptive optics in the near infrared to match the spatial resolution of HST, Fabry-Perot imaging of the emission line nebulae, particularly the dynamics of 4C23.56, and imaging polarimetry.
The observational descriptions presented in this paper are intended to illustrate the observed features of individual radio sources and the optical objects associated with them. The alignment effect is a catch-all name for a rich and complex relationship between the nucleus, the radio axis, the radio jet, the lobes, their radiation mechanisms and the environment in which they are embedded. Given the variety and diversity of these objects, it is one of the few generalizations that one can make.
Support for this work was provided by NASA through grant number GO-2438 from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555, and by the State of Hawaii and ASTRON, the Netherlands Foundation for Research in Astronomy. The work by W.v.B. on this project was performed at IGPP/LLNL under the auspices of the U.S. Dept. of Energy under contract W-7405-ENG-48.