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 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 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

VERITAS OBSERVATIONS OF RELATIVISTIC JETS

2012 ◽  
Vol 08 ◽  
pp. 55-60
Author(s):  
RESHMI MUKHERJEE
Keyword(s):  
Black Holes ◽  
Supernova Remnants ◽  
Binary Systems ◽  
Active Galaxies ◽  
Relativistic Jets ◽  
Pulsar Wind Nebulae ◽  
Cherenkov Telescopes ◽  
Astrophysical Objects ◽  
Pulsar Wind ◽  
Galactic Sources

VERITAS is an array of four imaging atmospheric Cherenkov telescopes located in southern Arizona, and is now starting its fifth year of observations of the northern Sky at energies > 100 GeV. Observations of astrophysical objects in the TeV band are sensitive probes of highly energetic processes occurring in these sources. The majority of the active galaxies detected at TeV energies are blazars, sources where we view the jet nearly along its axis. TeV and multiwavelength observations of blazars help us to better understand the mechanisms of ultrarelativistic jet production by supermassive black holes, and constrain models of particle acceleration in blazar jets. Galactic sources at TeV energies include supernova remnants, pulsar wind nebulae, and binary systems, and TeV emission is a key diagnostic of highly energetic particles in these objects. This report presents recent results from VERITAS on Galactic and extragalactic sources.

Supermassive binary black holes - possible observational effects in the x-ray emission

2014 ◽  
Vol 12 (2) ◽  
pp. 159-166
Author(s):  
Predrag Jovanovic ◽  
Luka Popovic
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Accretion Disks ◽  
Observational Studies ◽  
Close Binary ◽  
Kerr Metric ◽  
Binary Black Holes ◽  
X Ray ◽  
Binary Black Hole ◽  
Tracing Method

Here we discuss the possible observational effects in the X-ray emission from two relativistic accretion disks in a supermassive binary black hole system. For that purpose we developed a model and performed numerical simulations of the X-ray radiation from a relativistic accretion disk around a supermassive black hole, based on the ray-tracing method in the Kerr metric, and applied it to the case of the close binary supermassive black holes. Our results indicate that the broad Fe K? line is a powerful tool for detecting such systems and studying their properties. The most favorable candidates for observational studies are the supermassive binary black holes in the galactic mergers during the phase when the orbital velocities of their components are very large and exceed several thousand kms -1.

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
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