Hyper- and Suspended-accretion States of Rotating Black Holes and the Durations of Gamma-ray Bursts
نویسندگان
چکیده
We analyze the temporal evolution of accretion onto rotating black holes subject to large-scale magnetic torques. Wind torques alone drive a disk towards collapse in a finite time ∼ tffEk/EB, where tff is the initial free-fall time and Ek/EB is the ratio of kinetic-to-poloidal-magnetic energy. Additional spinup torques from a rapidly rotating black hole can arrest the disk’s inflow. We associate short/long gamma-ray bursts with hyperaccretion/suspended-accretion onto slowly/rapidly spinning black holes. This model predicts afterglow emission from short bursts, and may be tested by HETE-II. Subject headings: black hole physics — gamma-rays: bursts and theory
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