Accretion environments of active galactic nuclei

Abstract We study accretion environments of active galactic nuclei when a supermassive black hole wanders in circumnuclear region and passes through an interstellar medium there. It is expected that Bondi–Hoyle–Lyttleton-type the matter takes place stream trapped by gravitational field appears from tail shock region. Since likely to have certain amount specific angular momentum, eventually forms ring around hole. According recent studies, consists thick envelope thin core, momenta are transferred inner side facing opposite core respectively. As result, flow excretion extend envelope, disk core. The predicted terminate at some distance, forming ring, while considered become supersonic wind flowing infinity. interact with toward be collimated bipolar cones. These pictures provide guideline interpreting overall suggested observations.