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Magnetically-levitating disks around supermassive black holes

Gaburov, Evghenii; Johansen, Anders LU and Levin, Yuri (2012) In Astrophysical Journal 758(2).
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
fields, magnetic, ISM: clouds, accretion disks, accretion, Galaxy: nucleus, magnetohydrodynamics (MHD), methods: numerical
in
Astrophysical Journal
volume
758
issue
2
publisher
University of Chicago Press
external identifiers
  • wos:000310562000032
  • scopus:84867324459
ISSN
0004-637X
DOI
10.1088/0004-637X/758/2/103
language
English
LU publication?
yes
id
7af9e3d8-15b6-4863-8b23-6448bada99ed (old id 3276215)
alternative location
http://arxiv.org/abs/1201.4873
date added to LUP
2012-12-20 14:10:08
date last changed
2017-10-29 04:01:56
@article{7af9e3d8-15b6-4863-8b23-6448bada99ed,
  abstract     = {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.},
  articleno    = {103},
  author       = {Gaburov, Evghenii and Johansen, Anders and Levin, Yuri},
  issn         = {0004-637X},
  keyword      = {fields,magnetic,ISM: clouds,accretion disks,accretion,Galaxy: nucleus,magnetohydrodynamics (MHD),methods: numerical},
  language     = {eng},
  number       = {2},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {Magnetically-levitating disks around supermassive black holes},
  url          = {http://dx.doi.org/10.1088/0004-637X/758/2/103},
  volume       = {758},
  year         = {2012},
}