Constraining the parameters of the putative supermassive binary black hole in PG 1302-102 from its radio structure

摘要: We investigate the pc-scale kinematics and kpc-scale radio morphology of quasar PG 1302-102, which may harbour a sub-pc separation supermassive binary black hole system at its centre as inferred from optical variability. High-resolution interferometric measurements obtained with Very Long Baseline Array (VLBA) in Monitoring Of Jets Active galactic nuclei VLBA Experiments (MOJAVE) programme 15 GHz 20 epochs spanning 17 years were analysed to structure. Archival observations Large (VLA) 1.4 5 study morphology. find that jet is inclined within ~2.2 deg line sight has half-opening angle about 0.2 deg. The parameters derived are qualitatively consistent those analysis light curve 1302-102. obtain least 0.08 for mass ratio two holes system. some indication helical structure on kpc-scale, but directions inner extended jets significantly different, obstructing straightforward connection pc- scenario.