Black hole jet power from impedance matching
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 exte...
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| Format: | Article |
| Language: | English |
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American Physical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/99192 https://orcid.org/0000-0003-3932-6174 |
| _version_ | 1826211112071200768 |
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| author | Penna, Robert |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Penna, Robert |
| author_sort | Penna, Robert |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T15:00:46Z |
| format | Article |
| id | mit-1721.1/99192 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:00:46Z |
| publishDate | 2015 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/991922022-09-29T12:02:47Z Black hole jet power from impedance matching Penna, Robert Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Penna, Robert 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 of Physics Pappalardo Program (Fellowship) 2015-10-07T16:52:15Z 2015-10-07T16:52:15Z 2015-10 2015-07 2015-10-06T22:00:17Z Article http://purl.org/eprint/type/JournalArticle 1550-7998 1550-2368 http://hdl.handle.net/1721.1/99192 Penna, Robert F. "Black hole jet power from impedance matching." Phys. Rev. D 92, 084017 (October 2015). © 2015 American Physical Society https://orcid.org/0000-0003-3932-6174 en http://dx.doi.org/10.1103/PhysRevD.92.084017 Physical Review D 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. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Penna, Robert Black hole jet power from impedance matching |
| title | Black hole jet power from impedance matching |
| title_full | Black hole jet power from impedance matching |
| title_fullStr | Black hole jet power from impedance matching |
| title_full_unstemmed | Black hole jet power from impedance matching |
| title_short | Black hole jet power from impedance matching |
| title_sort | black hole jet power from impedance matching |
| url | http://hdl.handle.net/1721.1/99192 https://orcid.org/0000-0003-3932-6174 |
| work_keys_str_mv | AT pennarobert blackholejetpowerfromimpedancematching |