Double-peaked Lines, Dual VLBI Components, and Precessing Jets in J1328+2752

Abstract In this work, we report a radio galaxy with precessing jets, double-peaked emission lines and the presence of two compact components projected separation ?6 parsec in very long baseline interferometry (VLBI) observations. The emission-line peak separations could be suggesting supermassive binary black hole (BBH) 6.3 parsec, matching VLBI results. kinematic jet precession model applied to jets J1328+2752 indicates that if it is BBH, accretion disk primary not coplanar system orbit, making its precess under effect torque produced by secondary hole. However, find Bardeen–Petterson can also provide timescales compatible period inferred source. This source has previously been identified as restarted double–double (DDRG). Our findings therefore have important ramifications for nature DDRGs general.