The jet power extracted from a magnetized accretion disc

Abstract

We consider the power of a relativistic jet accelerated by the magnetic field of an accretion disc. It is found that the power extracted from the disc is mainly determined by the field strength and configuration of the field far from the disc. Comparing with the power extracted from a rotating black hole, we find that the jet power extracted from a disc can dominate over that from the rotating black hole. But in some cases, the jet power extracted from a rapidly rotating hole can be more important than that from the disc even if the poloidal field threading the hole is not significantly larger than that threading the inner edge of the disc. The results imply that the radio-loudness of quasars may be governed by its accretion rate which might be regulated by the central black hole mass. It is proposed that the different disc field generation mechanisms might be tested against observations of radio-loud quasars if their black hole masses are available.

6 pages, accepted for publication in MNRAS

References in corpus (3)

• Black Hole Mass and Eddington Ratio as Drivers for the Observable Properties of Radio-Loud and Radio-Quiet QSOs
• On the Relationship Between Radio Emission and Black Hole Mass in Galactic Nuclei
• On the masses of black-holes in radio-loud quasars

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• Variabilities of Gamma-ray Bursts from Black Hole Hyper-accretion Disks
• A simplified model of jet power from active galactic nuclei
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• A Simplified Model of ADAF with the Jet Driven by the Large-Scale Magnetic Field
• A disk-corona model for low/hard state of black hole X-ray binaries
• State transitions triggered by inverse magnetic field: probably applied in high-mass X-ray binaries?