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- Publisher Website: 10.1093/mnrasl/slv115
- Scopus: eid_2-s2.0-84944895382
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Article: Efficiency of super-Eddington magnetically-arrested accretion
Title | Efficiency of super-Eddington magnetically-arrested accretion |
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Authors | |
Keywords | Radiation: dynamics Accretion, accretion discs MHD |
Issue Date | 2015 |
Citation | Monthly Notices of the Royal Astronomical Society: Letters, 2015, v. 454, n. 1, p. L6-L10 How to Cite? |
Abstract | © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. The radiative efficiency of super-Eddington accreting black holes (BHs) is explored for magnetically-arrested discs, where magnetic flux builds-up to saturation near the BH. Our three-dimensional general relativistic radiation magnetohydrodynamic (GRRMHD) simulation of a spinning BH (spin a/M = 0.8) accreting at ~50 times Eddington shows a total efficiency ~50 per cent when time-averaged and total efficiency ≳ 100 per cent in moments. Magnetic compression by the magnetic flux near the rotating BH leads to a thin disc, whose radiation escapes via advection by a magnetized wind and via transport through a low-density channel created by a Blandford-Znajek (BZ) jet. The BZ efficiency is sub-optimal due to inertial loading of field lines by optically thick radiation, leading to BZ efficiency ~40 per cent on the horizon and BZ efficiency ~5 per cent by r ~ 400rg (gravitational radii) via absorption by the wind. Importantly, radiation escapes at r ~ 400rg with efficiency η ≈ 15 per cent (luminosity L ~ 50LEdd), similar to η ≈ 12 per cent for a Novikov-Thorne thin disc and beyond η ≲ 1 per cent seen in prior GRRMHD simulations or slim disc theory. Our simulations show how BH spin, magnetic field, and jet mass-loading affect these radiative and jet efficiencies. |
Persistent Identifier | http://hdl.handle.net/10722/269736 |
DC Field | Value | Language |
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dc.contributor.author | McKinney, Jonathan C. | - |
dc.contributor.author | Dai, Lixin | - |
dc.contributor.author | Avara, Mark J. | - |
dc.date.accessioned | 2019-04-30T01:49:26Z | - |
dc.date.available | 2019-04-30T01:49:26Z | - |
dc.date.issued | 2015 | - |
dc.identifier.citation | Monthly Notices of the Royal Astronomical Society: Letters, 2015, v. 454, n. 1, p. L6-L10 | - |
dc.identifier.uri | http://hdl.handle.net/10722/269736 | - |
dc.description.abstract | © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. The radiative efficiency of super-Eddington accreting black holes (BHs) is explored for magnetically-arrested discs, where magnetic flux builds-up to saturation near the BH. Our three-dimensional general relativistic radiation magnetohydrodynamic (GRRMHD) simulation of a spinning BH (spin a/M = 0.8) accreting at ~50 times Eddington shows a total efficiency ~50 per cent when time-averaged and total efficiency ≳ 100 per cent in moments. Magnetic compression by the magnetic flux near the rotating BH leads to a thin disc, whose radiation escapes via advection by a magnetized wind and via transport through a low-density channel created by a Blandford-Znajek (BZ) jet. The BZ efficiency is sub-optimal due to inertial loading of field lines by optically thick radiation, leading to BZ efficiency ~40 per cent on the horizon and BZ efficiency ~5 per cent by r ~ 400rg (gravitational radii) via absorption by the wind. Importantly, radiation escapes at r ~ 400rg with efficiency η ≈ 15 per cent (luminosity L ~ 50LEdd), similar to η ≈ 12 per cent for a Novikov-Thorne thin disc and beyond η ≲ 1 per cent seen in prior GRRMHD simulations or slim disc theory. Our simulations show how BH spin, magnetic field, and jet mass-loading affect these radiative and jet efficiencies. | - |
dc.language | eng | - |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society: Letters | - |
dc.subject | Radiation: dynamics | - |
dc.subject | Accretion, accretion discs | - |
dc.subject | MHD | - |
dc.title | Efficiency of super-Eddington magnetically-arrested accretion | - |
dc.type | Article | - |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1093/mnrasl/slv115 | - |
dc.identifier.scopus | eid_2-s2.0-84944895382 | - |
dc.identifier.volume | 454 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | L6 | - |
dc.identifier.epage | L10 | - |
dc.identifier.eissn | 1745-3933 | - |
dc.identifier.issnl | 1745-3933 | - |