2003/06/04 by D. X. Wang, Ding-Xiong Wang, R. Y. Ma +5 · 6 citations
Physics and Astronomy · #Accretion (finance) #Angular momentum #Angular velocity #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Black hole (networking) #Classical mechanics #Galaxy #Horizon #Inductive coupling #Magnetic field #Magnetosphere #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #RADIUS #Redshift #Rotating black hole #astro-ph
paper · pdf · doi:10.1086/377303
published as Astrophys.J. 595 (2003) 109-119 · 24 pages, 19 figures. Accepted by ApJ
arxiv created 2003/06/04 · openalex publication_date 2003/09/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The effects of the magnetic coupling (MC) of a rotating black hole (BH) with its surrounding accretion disk are discussed in detail in the following aspects: (1) The mapping relation between the angular coordinate on the BH horizon and the radial coordinate on the disk is modified based on a more reasonable configuration of magnetic field, and a condition for the coexistence of the Blandford-Znajek (BZ) and the MC process is derived. (2) The transfer direction of energy and angular momentum in the MC process is described equivalently by the corotation radius and by the flow of electromagnetic angular momentum and redshifted energy, where the latter is based on an assumption that the theory of the BH magnetosphere is applicable to both the BZ and MC processes. (3) The profile of the current on the BH horizon and that of the current density flowing from the magnetosphere onto the horizon are given in terms of the angular coordinate of the horizon. It is shown that the current on the BH horizon varies with the latitude of the horizon and is not continuous at the angular boundary between the open and closed magnetic field lines. (4) The MC effects on disk radiation are discussed, and a very steep emissivity is produced by the MC process, which is consistent with the recent XMM-Newton observation of the nearby bright Seyfert 1 galaxy MCG -6-30-15 in a variety of parameters of the BH-disk system.