MAGNETICALLY LEVITATING ACCRETION DISKS AROUND SUPERMASSIVE BLACK HOLES

被引：44
|
作者：
Gaburov, Evghenii [1 ]
Johansen, Anders [2 ]
Levin, Yuri [3 ,4 ,5 ]
机构：
[1] Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astrophys, Evanston, IL 60208 USA
[2] Lund Univ, Dept Astron & Theoret Phys, Lund Observ, SE-22100 Lund, Sweden
[3] Monash Univ, Sch Phys, Clayton, Vic 3800, Australia
[4] Monash Univ, Monash Ctr Astrophys, Clayton, Vic 3800, Australia
[5] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
来源：
ASTROPHYSICAL JOURNAL | 2012年 / 758卷 / 02期
关键词：
accretion; accretion disks; Galaxy: nucleus; ISM: clouds; magnetic fields; magnetohydrodynamics (MHD); methods: numerical; ACTIVE GALACTIC NUCLEI; STAR-FORMATION; MAGNETOHYDRODYNAMIC SIMULATIONS; PARTICLE MAGNETOHYDRODYNAMICS; MAGNETIZED DISKS; TURBULENCE; DISCS; NGC-1068; FIELDS; FLOWS;
D O I：
10.1088/0004-637X/758/2/103
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
In this paper, we report on the formation of magnetically levitating accretion disks around supermassive black holes (SMBHs). The structure of these disks is calculated by numerically modeling tidal disruption of magnetized interstellar gas clouds. We find that the resulting disks are entirely supported by the pressure of the magnetic fields against the component of gravitational force directed perpendicular to the disks. The magnetic field shows ordered large-scale geometry that remains stable for the duration of our numerical experiments extending over 10% of the disk lifetime. Strong magnetic pressure allows high accretion rate and inhibits disk fragmentation. This in combination with the repeated feeding of magnetized molecular clouds to an SMBH yields a possible solution to the long-standing puzzle of black hole growth in the centers of galaxies.
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页数：11
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