Searching for Dual Active Galactic Nuclei
  Binary or dual active galactic nuclei (DAGN) are expected from galaxy
formation theories. However, confirmed DAGN are rare and finding these systems
has proved to be challenging. Recent systematic searches for DAGN using
double-peaked emission lines have yielded several new detections. As have the
studies of samples of merging galaxies. In this paper, we present an updated
list of DAGN compiled from published data. We also present preliminary results
from our ongoing Expanded Very Large Array (EVLA) radio study of eight double-
peaked emission-line AGN (DPAGN). One of the sample galaxy shows an S-shaped
radio jet. Using new and archival data, we have successfully fitted a
precessing jet model to this radio source. We find that the jet precession
could be due to a binary AGN with a super-massive black-hole (SMBH) separation
of 0.02 pc or a single AGN with a tilted accretion disk. We have found that
another sample galaxy, which is undergoing a merger, has two radio cores with a
projected separation of 5.6 kpc. We discuss the preliminary results from our
radio study.
