EDP Sciences
Free Access
Volume 416, Number 2, March III 2004
Page(s) 423 - 435
Section Astrophysical processes
DOI https://doi.org/10.1051/0004-6361:20034089
Published online 27 February 2004

A&A 416, 423-435 (2004)
DOI: 10.1051/0004-6361:20034089

A model for electromagnetic extraction of rotational energy and formation of accretion-powered jets in radio galaxies

A. Hujeirat

Max-Planck-Institut für Astronomie, 69117 Heidelberg, Germany
(Received 17 July 2003 / Accepted 21 November 2003 )

A self-similar solution for the 3D axi-symmetric radiative MHD equations is presented, which revisits the formation and acceleration of accretion-powered jets in AGNs and microquasars. The model relies primarily on electromagnetic extraction of rotational energy from the disk plasma and forming a geometrically thin super-Keplerian layer between the disk and the overlying corona. The outflowing plasma in this layer is dissipative, two-temperature, virial-hot, advective and electron-proton dominated. The innermost part of the disk in this model is turbulent-free, sub-Keplerian rotating and advective-dominated. This part ceases to radiate as a standard disk, and most of the accretion energy is converted into magnetic and kinetic energies that go into powering the jet. The corresponding luminosities of these turbulent-truncated disks are discussed. In the case of a spinning black hole accreting at low accretion rates, the Blandford-Znajek process is found to modify the total power of the jet, depending on the accretion rate.

Key words: galaxies: jets -- black hole physics -- accretion, accretion disks -- magnetohydrodynamics -- radiative transfer

SIMBAD Objects

© ESO 2004

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.