scholarly journals Accretion disks around binary black holes of unequal mass: General relativistic magnetohydrodynamic simulations near decoupling

2014 ◽  
Vol 89 (6) ◽  
Author(s):  
Roman Gold ◽  
Vasileios Paschalidis ◽  
Zachariah B. Etienne ◽  
Stuart L. Shapiro ◽  
Harald P. Pfeiffer
Keyword(s):  
Black Holes ◽  
Accretion Disks ◽  
Binary Black Holes ◽  
Unequal Mass ◽  
General Relativistic ◽  
Magnetohydrodynamic Simulations

scholarly journals Accretion disks around binary black holes of unequal mass: General relativistic MHD simulations of postdecoupling and merger

2014 ◽  
Vol 90 (10) ◽  
Author(s):  
Roman Gold ◽  
Vasileios Paschalidis ◽  
Milton Ruiz ◽  
Stuart L. Shapiro ◽  
Zachariah B. Etienne ◽  
...  
Keyword(s):  
Black Holes ◽  
Accretion Disks ◽  
Binary Black Holes ◽  
Unequal Mass ◽  
Mhd Simulations ◽  
General Relativistic

scholarly journals Plasmoid formation in global GRMHD simulations and AGN flares

2020 ◽  
Vol 495 (2) ◽  
pp. 1549-1565 ◽  
Author(s):  
Antonios Nathanail ◽  
Christian M Fromm ◽  
Oliver Porth ◽  
Hector Olivares ◽  
Ziri Younsi ◽  
...  
Keyword(s):  
Black Holes ◽  
Dipolar Field ◽  
Relativistic Jets ◽  
Poloidal Magnetic Field ◽  
Accretion Flows ◽  
Rotating Black Holes ◽  
General Relativistic ◽  
Formation And Evolution ◽  
Magnetohydrodynamic Simulations ◽  
Dissipation Processes

ABSTRACT One of the main dissipation processes acting on all scales in relativistic jets is thought to be governed by magnetic reconnection. Such dissipation processes have been studied in idealized environments, such as reconnection layers, which evolve in merging islands and lead to the production of ‘plasmoids’, ultimately resulting in efficient particle acceleration. In accretion flows on to black holes, reconnection layers can be developed and destroyed rapidly during the turbulent evolution of the flow. We present a series of two-dimensional general-relativistic magnetohydrodynamic simulations of tori accreting on to rotating black holes focusing our attention on the formation and evolution of current sheets. Initially, the tori are endowed with a poloidal magnetic field having a multiloop structure along the radial direction and with an alternating polarity. During reconnection processes, plasmoids and plasmoid chains are developed leading to a flaring activity and hence to a variable electromagnetic luminosity. We describe the methods developed to track automatically the plasmoids that are generated and ejected during the simulation, contrasting the behaviour of multiloop initial data with that encountered in typical simulations of accreting black holes having initial dipolar field composed of one loop only. Finally, we discuss the implications that our results have on the variability to be expected in accreting supermassive black holes.

General Relativistic Effects on the Spectrum Reflected by Accretion Disks around Black Holes

1998 ◽  
Vol 504 (1) ◽  
pp. 58-63 ◽  
Author(s):  
Gang Bao ◽  
Paul J. Wiita ◽  
Petr Hadrava
Keyword(s):  
Black Holes ◽  
Accretion Disks ◽  
Relativistic Effects ◽  
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 Global Radiation Magnetohydrodynamic Simulations of sub-Eddington Accretion Disks around Supermassive Black Holes

2019 ◽  
Vol 885 (2) ◽  
pp. 144 ◽  
Author(s):  
Yan-Fei Jiang ◽  
Omer Blaes ◽  
James M. Stone ◽  
Shane W. Davis
Keyword(s):  
Black Holes ◽  
Accretion Disks ◽  
Global Radiation ◽  
Supermassive Black Holes ◽  
Magnetohydrodynamic Simulations

scholarly journals Tracking the moving optical photocenters of active galaxies: binary black holes, accretion disks and relativistic jets

2003 ◽  
Author(s):  
Ann E. Wehrle ◽  
Stephen C. Unwin ◽  
Dayton L. Jones ◽  
David L. Meier ◽  
B. G. Piner
Keyword(s):  
Black Holes ◽  
Accretion Disks ◽  
Active Galaxies ◽  
Relativistic Jets ◽  
Binary Black Holes

scholarly journals Accretion disks around binary black holes: A simple GR-hybrid evolution model

2013 ◽  
Vol 87 (10) ◽  
Author(s):  
Stuart L. Shapiro
Keyword(s):  
Black Holes ◽  
Accretion Disks ◽  
Evolution Model ◽  
Binary Black Holes
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