scholarly journals Compton Scattering of Polarized Radiation in Two‐Phase Accretion Disks in Active Galactic Nuclei

1998 ◽  
Vol 506 (2) ◽  
pp. 658-672 ◽  
Author(s):  
Chia‐Ming Hsu ◽  
Omer Blaes
Keyword(s):  
Active Galactic Nuclei ◽  
Compton Scattering ◽  
Accretion Disks ◽  
Galactic Nuclei ◽  
Two Phase ◽  
Polarized Radiation

Spectral distribution of the polarized radiation from standard accretion disks in Active Galactic Nuclei: Observational analysis

2014 ◽  
Vol 58 (10) ◽  
pp. 725-732 ◽  
Author(s):  
V. L. Afanas’ev ◽  
N. V. Borisov ◽  
Yu. N. Gnedin ◽  
S. D. Buliga ◽  
T. M. Natsvlishvili ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Accretion Disks ◽  
Spectral Distribution ◽  
Galactic Nuclei ◽  
Observational Analysis ◽  
Polarized Radiation

scholarly journals Modelling the Polarization from Accretion Disks

1997 ◽  
Vol 163 ◽  
pp. 461-464
Author(s):  
O. J. Dittmann
Keyword(s):  
Active Galactic Nuclei ◽  
Optical Depth ◽  
Accretion Disks ◽  
Transfer Equation ◽  
Rayleigh Scattering ◽  
Operator Splitting ◽  
Galactic Nuclei ◽  
Scattering Parameter ◽  
Matrix Products ◽  
Polarized Radiation

AbstractThe 3D transfer equation for polarized radiation is solved for several different model configurations. In the case of Rayleigh scattering the phasematrix is decomposed into a sum of matrix products to allow the use of operator splitting iteration schemes. For 30 slabs with constant extinction matrix and constant emission the emerging polarized fiuxe are calculated. We find that the optical depth and the scattering parameter can be fixed from observations even if only the fluxes are known. Specifying the extinction matrix our models can be applied to the inner regions of active galactic nuclei.

scholarly journals Symmetry and the Arrow of Time in Theoretical Black Hole Astrophysics

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
David Garofalo
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Active Galactic Nuclei ◽  
Accretion Disks ◽  
Time Reversal ◽  
Large Scale ◽  
Galactic Nuclei ◽  
Arrow Of Time ◽  
Time Symmetry ◽  
The Universe

While the basic laws of physics seem time-reversal invariant, our understanding of the apparent irreversibility of the macroscopic world is well grounded in the notion of entropy. Because astrophysics deals with the largest structures in the Universe, one expects evidence there for the most pronounced entropic arrow of time. However, in recent theoretical astrophysics work it appears possible to identify constructs with time-reversal symmetry, which is puzzling in the large-scale realm especially because it involves the engines of powerful outflows in active galactic nuclei which deal with macroscopic constituents such as accretion disks, magnetic fields, and black holes. Nonetheless, the underlying theoretical structure from which this accreting black hole framework emerges displays a time-symmetric harmonic behavior, a feature reminiscent of basic and simple laws of physics. While we may expect such behavior for classical black holes due to their simplicity, manifestations of such symmetry on the scale of galaxies, instead, surprise. In fact, we identify a parallel between the astrophysical tug-of-war between accretion disks and jets in this model and the time symmetry-breaking of a simple overdamped harmonic oscillator. The validity of these theoretical ideas in combination with this unexpected parallel suggests that black holes are more influential in astrophysics than currently recognized and that black hole astrophysics is a more fundamental discipline.

Dependence of the Spin of Supermassive Black Holes on the Eddington Factor for Accretion Disks in Active Galactic Nuclei

Astrophysics ◽  
2016 ◽  
Vol 59 (4) ◽  
pp. 439-448 ◽  
Author(s):  
M. Yu. Piotrovich ◽  
S. D. Buliga ◽  
Yu. N. Gnedin ◽  
A. G. Mikhailov ◽  
T. M. Natsvlishvili
Keyword(s):  
Black Holes ◽  
Active Galactic Nuclei ◽  
Accretion Disks ◽  
Galactic Nuclei ◽  
Supermassive Black Holes
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