scholarly journals Three-dimensional general relativistic Poynting-Robertson effect. II. Radiation field from a rigidly rotating spherical source

2019 ◽  
Vol 100 (10) ◽  
Author(s):  
Pavel Bakala ◽  
Vittorio De Falco ◽  
Emmanuele Battista ◽  
Kateřina Goluchová ◽  
Debora Lančová ◽  
...  
Keyword(s):  
Radiation Field ◽  
Three Dimensional ◽  
Spherical Source ◽  
General Relativistic

scholarly journals Three-dimensional general relativistic Poynting-Robertson effect: Radial radiation field

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
Vittorio De Falco ◽  
Pavel Bakala ◽  
Emmanuele Battista ◽  
Debora Lančová ◽  
Maurizio Falanga ◽  
...  
Keyword(s):  
Radiation Field ◽  
Three Dimensional ◽  
General Relativistic

scholarly journals Alignment of Magnetized Accretion Disks and Relativistic Jets with Spinning Black Holes

Science ◽  
2012 ◽  
Vol 339 (6115) ◽  
pp. 49-52 ◽  
Author(s):  
Jonathan C. McKinney ◽  
Alexander Tchekhovskoy ◽  
Roger D. Blandford
Keyword(s):  
Black Holes ◽  
Accretion Disks ◽  
Three Dimensional ◽  
Host Galaxies ◽  
Relativistic Jets ◽  
Outer Disk ◽  
Alignment Mechanism ◽  
General Relativistic ◽  
Thin Disks ◽  
Intense Radiation

Accreting black holes (BHs) produce intense radiation and powerful relativistic jets, which are affected by the BH’s spin magnitude and direction. Although thin disks might align with the BH spin axis via the Bardeen-Petterson effect, this does not apply to jet systems with thick disks. We used fully three-dimensional general relativistic magnetohydrodynamical simulations to study accreting BHs with various spin vectors and disk thicknesses and with magnetic flux reaching saturation. Our simulations reveal a “magneto-spin alignment” mechanism that causes magnetized disks and jets to align with the BH spin near BHs and to reorient with the outer disk farther away. This mechanism has implications for the evolution of BH mass and spin, BH feedback on host galaxies, and resolved BH images for the accreting BHs in SgrA* and M87.

scholarly journals Linear and circular polarization of a 1D relativistic jet model

2019 ◽  
Vol 623 ◽  
pp. A152 ◽  
Author(s):  
M. Mościbrodzka
Keyword(s):  
Black Hole ◽  
Three Dimensional ◽  
Compact Objects ◽  
Slab Geometry ◽  
Relativistic Jet ◽  
General Relativistic ◽  
Low Dimensional ◽  
Polarization Models ◽  
Radiative Transfer Equations ◽  
Relativistic Magnetohydrodynamics

Context. Polarimetric observations of black holes allow us to probe structures of magnetic fields and plasmas in strong gravity. Aims. We present a study of the polarimetric properties of a synchrotron spectrum emitted from a relativistic jet using a low-dimensional model. Methods. A novel numerical scheme is used to integrate relativistic polarized radiative transfer equations in a slab geometry where the plasma conditions change along the integration path. Results. We find that the simple model of a non-uniform jet can recover basic observational characteristics of some astrophysical sources with a relativistic jet, such as extremely high rotation measures. Our models incorporate a time-dependent component. A small fluctuation in density or temperature of the plasma along the jet produces significant amounts of fluctuations not only in the fractional linear and circular polarizations, but also in the jet internal rotation measures. Conclusions. The low-dimensional models presented here are developed within the same computational framework as the complex three-dimensional general relativistic magnetohydrodynamics simulations of black hole disks and jets, and they offer guidance when interpreting the results from more complex polarization models. The models presented here are scalable to stationary and transient polarized radio emissions produced by relativistic plasma ejected from around compact objects, in both stellar-mass and supermassive black hole systems.

The isotropic scattering of radiation from an asymmetric spherical source in a finite atmosphere

1970 ◽  
Vol 68 (1) ◽  
pp. 213-224 ◽  
Author(s):  
M. G. Smith
Keyword(s):  
Integral Equation ◽  
Fourier Transform ◽  
Singular Integral Equation ◽  
Legendre Polynomials ◽  
Source Function ◽  
Three Dimensional ◽  
Isotropic Scattering ◽  
Spherical Source ◽  
Isotropic Source ◽  
Dominant Part

AbstractA singular integral equation is derived for the three-dimensional Fourier transform of the source function, when the scattering atmosphere is contained in a finite convex volume.This equation is shown to reduce to the usual equation in the case of an isotropic point source in a finite spherical atmosphere of radius R0, and is used to solve the same problem when the source is anisotropic.It is shown that in the latter case an expansion in Legendre polynomials results, in which the coefficients are obtained from the integral equations of a similar construction to those for an isotropic source. The error in taking the dominant part is now however of order 1/R0 and not e–R0.

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