Detecting Offset Active Galactic Nuclei
  Gravitational wave (GW) and gravitational slingshot recoil kicks, which are
natural products of SMBH evolution in merging galaxies, can produce active
galactic "nuclei" that are offset from the centers of their host galaxies.
Detections of offset AGN would provide key constraints on SMBH binary mass and
spin evolution and on GW event rates. Although numerous offset AGN candidates
have been identified, none have been definitively confirmed. Multi-wavelength
observations with next-generation telescopes, including systematic large-area
surveys, will provide unprecedented opportunities to identify and confirm
candidate offset AGN from sub-parsec to kiloparsec scales. We highlight ways in
which these observations will open a new avenue for multi-messenger studies in
the dawn of low-frequency (~ nHz - mHz) GW astronomy.
