Black hole jet power from impedance matching
Name
PhysRevD.92.084017.pdf
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643.13 KB
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Adobe PDF
Checksum (MD5)
ec10f8090d82bd029a2bf6a78e895b20
Author(s)
Penna, Robert
Date Issued
October 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Penna, Robert F. "Black hole jet power from impedance matching." Phys. Rev. D 92, 084017 (October 2015). © 2015 American Physical Society
Version
Final published version
Abstract
Black hole jet power depends on the angular velocity of magnetic field lines, Ω[subscript F]. Force-free black hole magnetospheres typically have Ω[subscript F]/Ω[subscript H] ≈ 0.5, where Ω[subscript H] is the angular velocity of the horizon. We give a streamlined proof of this result using an extension of the classical black hole membrane paradigm. The proof is based on an impedance-matching argument between membranes at the horizon and infinity. Then we consider a general relativistic magnetohydrodynamic simulation of an accreting, spinning black hole and jet. We find that the theory correctly describes the simulation in the jet region. However, the field lines threading the horizon near the equator have much smaller Ω[subscript F]/Ω[subscript H] because the force-free approximation breaks down in the accretion flow.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.92.084017
