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Efficiency of Thin Magnetically-Arrested Disks Around Black Holes | Mark J. Avara
; Jonathan C. McKinney
; Chris S. Reynolds
; | Date: |
21 Aug 2015 | Abstract: | The radiative and jet efficiencies of thin magnetized accretion disks around
black holes (BHs) are affected by BH spin and the presence of a magnetic field
that, when strong, could lead to large deviations from Novikov-Thorne (NT) thin
disk theory. To seek the maximum deviations, we perform general relativistic
magnetohydrodynamic (GRMHD) simulations of radiatively efficient thin
(half-height $H$ to radius $R$ of $H/Rapprox 0.10$) disks around moderately
rotating BHs with $a/M=0.5$. First, our simulations, evolved for $108,000r_g/c$
(gravitational radius $r_g$ and speed of light $c$), show that large-scale
magnetic field readily accretes inward even through our thin disk and builds-up
to the magnetically-arrested disk (MAD) state. Second, our simulations of thin
MADs show the disk achieves a radiative efficiency of $eta_{
m r}approx
15\%$ (after estimating photon capture), which is about twice the NT value of
$eta_{
m r}sim 8\%$ for $a/M=0.5$ and gives the same luminosity as a NT disk
with $a/Mapprox 0.9$. Compared to prior simulations with $lesssim 10\%$
deviations, our result of an $approx 80\%$ deviation sets a new benchmark.
This is important as our scaling laws suggest that observed jet quenching in
the high-soft state in BH X-ray binaries is consistent with an ever-present MAD
state. | Source: | arXiv, 1508.5323 | Services: | Forum | Review | PDF | Favorites |
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