DOI

https://doi.org/10.48717/ezrc-0r68

Project

RSY06

Title

e-EVN: RSY06, RSM01, EG096D, EP105B

Abstract

According to hierarchical structure formation theory, galaxy mergers are very common in the universe, and a merger of galaxies will eventually form dual/binary supermassive black hole. However, we have not found effective methods to search for dual SMBH candidates until now. X-shaped radio galaxies are long suggested to originate from a dual-SMBH interaction, yet there is an absence of enough observational support. The source J0725+5835 was previously selected as an X-shaped radio galaxy; recently an observation has been performed using VLA to study details of its X-shaped morphology. New data show evidence of an extra core as a compact and bright component appearing nearby, and the central core is also observed at one of bands. Here, we propose a short e-EVN observation at 1.6 or 4.8 GHz to confirm the presence of a dual compact radio core (especially the off-axis one) at milli-arcsec scale. This proposed observation can not only test the origin of X-shaped radio galaxies via a pair of supermassive black holes but also will possibly identify a rare dual radio active galactic nuclei system.