CAN THE FORMATION OF X-RAY-OBSCURING TORI AND JETS IN ACTIVE GALAXIESBE DETERMINED BY ONE-PARAMETER

A torus of reduced differential rotation can form in the inner less th an or similar to 10 pc core of active galactic nuclei (AGNs), incurrin g a density enhancement that can account for obscuration of X-rays in Seyfert galaxies when the initial inner core-to-black hole mass ratio is greater than or similar to 50. The same density enhancement can als o lead to dynamo growth of significant poloidal magnetic fields when a ccreted onto the central engine. Since radio jet models often employ p oloidal fields as agents in extracting power for the jet luminosity, w e suggest that jetted AGNs might require this poloidal field productio n. Although the poloidal field would originally be produced in the obs curing torus, jetted objects could exist without obscuring tori: The p oloidal field would only aid in powering jet emission after it accrete s with the torus matter to the central engine. Thus, only during the r elatively short torus accretion timescale could there be both a jet an d a torus.