Twin SMBH candidates in the BCG of RBS 797
  The radio-loud BCG at the center of the cool core cluster RBS 797 is known to
exhibit a misalignment of its 5 GHz radio emission observed at different VLA
resolutions, with the innermost kpc-scale jets being almost orthogonal to the
radio lobes which extends for tens of kpc filling the X-ray cavities seen by
Chandra. The different radio directions may be caused by rapid jet
reorientation due to interaction with a secondary supermassive black hole
(SMBH), or to the presence of two AGN, probably in a merging phase, which are
emitting radio jets in different directions. We present the results of new 5
GHz observations performed with the EVN in May 2013. In particular, we detected
two compact radio components, with a projected separation of 77 pc. We discuss
two possible scenarios for the origin and nature of the EVN double source,
showing that both interpretations are consistent with the presence of a SMBH
binary system in the BCG of RBS 797.
