Peculiar Radio Structures in the Central Regions of Galaxy Cluster Abell
  585
  In this paper we analyze the peculiar radio structure observed across the
central region of the galaxy cluster Abell 585 (z=0.12). In the low-resolution
radio maps, this structure appears uniform and diffuse on angular scales of ~3
arcmin, and is seemingly related to the distant (z=2.5) radio quasar B3
0727+409 rather than to the cluster itself. However, after a careful
investigation of the unpublished archival radio data with better angular
resolution, we resolve the structure into two distinct arcmin-scale features,
which resemble typical lobes of cluster radio galaxies with no obvious
connection to the background quasar. We support this conclusion by examining
the spectral and polarization properties of the features, demonstrating in
addition that the analyzed structure can hardly be associated with any sort of
a radio mini-halo or relics of the cluster. Yet at the same time we are not
able to identify host galaxies of the radio lobes in the available optical and
infrared surveys. We consider some speculative explanations for our findings,
including gravitational wave recoil kicks of SMBHs responsible for the lobes'
formation in the process of merging massive ellipticals within the central
parts of a rich cluster environment, but we do not reach any robust conclusions
regarding the origin of the detected radio features.
