2014MNRAS.439.2314P

RC J0311+0507 is one of the most luminous objects in the high-redshift Universe having L ≥ 3x10²⁹ W/Hz at a 500 MHz rest frequency. A very steep radio spectrum and an indication of a Fanaroff-Riley type II (FR II) structure from early Very Large Array (VLA) maps suggested the presence of a supermassive black hole inside the parent galaxy. Multi-Element Radio-Linked Interferometer Network and European Very Long Baseline Interferometer Network maps (intensity and polarization) of this object at 1.7 and 5 GHz with an order of magnitude better resolution than that of the VLA are presented. Also included are further optical observations with the Russian 6-m telescope and infrared K-band observations with the United Kingdom Infra-Red Telescope, which indicate the object to be a galaxy. The new radio observations now confirm the source's structure to be that of an FR II, but with a high degree of asymmetry in the flux densities of the source components.