scholarly journals Fully general relativistic magnetohydrodynamic simulations of accretion flows onto spinning massive black hole binary mergers

2021 ◽  
Vol 103 (10) ◽  
Author(s):  
Federico Cattorini ◽  
Bruno Giacomazzo ◽  
Francesco Haardt ◽  
Monica Colpi
Keyword(s):  
Black Hole ◽  
Massive Black Hole ◽  
Accretion Flows ◽  
Binary Mergers ◽  
General Relativistic ◽  
Black Hole Binary ◽  
Magnetohydrodynamic Simulations

scholarly journals Massive black hole binary mergers within subparsec scale gas discs

2009 ◽  
Vol 393 (4) ◽  
pp. 1423-1432 ◽  
Author(s):  
J. Cuadra ◽  
P. J. Armitage ◽  
R. D. Alexander ◽  
M. C. Begelman
Keyword(s):  
Black Hole ◽  
Massive Black Hole ◽  
Binary Mergers ◽  
Black Hole Binary

scholarly journals Status of GRMHD simulations and radiative models of Sgr A*

2016 ◽  
Vol 11 (S322) ◽  
pp. 43-49
Author(s):  
Monika Mościbrodzka
Keyword(s):  
Black Hole ◽  
Galactic Center ◽  
Kerr Black Hole ◽  
Theoretical Models ◽  
Radiative Properties ◽  
X Ray ◽  
Accretion Flows ◽  
General Relativistic ◽  
Sgr A ◽  
Magnetohydrodynamic Simulations

AbstractThe Galactic center is a perfect laboratory for testing various theoretical models of accretion flows onto a supermassive black hole. Here, I review general relativistic magnetohydrodynamic simulations that were used to model emission from the central object - Sgr A*. These models predict dynamical and radiative properties of hot, magnetized, thick accretion disks with jets around a Kerr black hole. Models are compared to radio-VLBI, mm-VLBI, NIR, and X-ray observations of Sgr A*. I present the recent constrains on the free parameters of the model such as accretion rate onto the black hole, the black hole angular momentum, and orientation of the system with respect to our line of sight.

scholarly journals Massive black hole binary mergers in dynamical galactic environments

2016 ◽  
Vol 464 (3) ◽  
pp. 3131-3157 ◽  
Author(s):  
Luke Zoltan Kelley ◽  
Laura Blecha ◽  
Lars Hernquist
Keyword(s):  
Black Hole ◽  
Massive Black Hole ◽  
Binary Mergers ◽  
Black Hole Binary

scholarly journals Relative depolarization of the black hole photon ring in GRMHD models of Sgr A* and M87*

2021 ◽  
Vol 503 (3) ◽  
pp. 4563-4575
Author(s):  
A Jiménez-Rosales ◽  
J Dexter ◽  
S M Ressler ◽  
A Tchekhovskoy ◽  
M Bauböck ◽  
...  
Keyword(s):  
Black Hole ◽  
Relativistic Effects ◽  
Image Features ◽  
Black Hole Mass ◽  
Magnetic Turbulence ◽  
Intensity Images ◽  
General Relativistic ◽  
Sharp Image ◽  
Sgr A ◽  
Magnetohydrodynamic Simulations

ABSTRACT Using general relativistic magnetohydrodynamic simulations of accreting black holes, we show that a suitable subtraction of the linear polarization per pixel from total intensity images can enhance the photon ring feature. We find that the photon ring is typically a factor of ≃2 less polarized than the rest of the image. This is due to a combination of plasma and general relativistic effects, as well as magnetic turbulence. When there are no other persistently depolarized image features, adding the subtracted residuals over time results in a sharp image of the photon ring. We show that the method works well for sample, viable GRMHD models of Sgr A* and M87*, where measurements of the photon ring properties would provide new measurements of black hole mass and spin, and potentially allow for tests of the ‘no-hair’ theorem of general relativity.

scholarly journals Astrophysical constraints on massive black hole binary evolution from pulsar timing arrays

2015 ◽  
Vol 455 (1) ◽  
pp. L72-L76 ◽  
Author(s):  
Hannah Middleton ◽  
Walter Del Pozzo ◽  
Will M. Farr ◽  
Alberto Sesana ◽  
Alberto Vecchio
Keyword(s):  
Black Hole ◽  
Massive Black Hole ◽  
Pulsar Timing ◽  
Black Hole Binary ◽  
Binary Evolution
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