Numerical Simulations of Black Hole Accretion
Author | : Geoffrey Ryan |
Publisher | : |
Total Pages | : 0 |
Release | : 2017 |
Genre | : |
ISBN | : |
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Author | : Geoffrey Ryan |
Publisher | : |
Total Pages | : 0 |
Release | : 2017 |
Genre | : |
ISBN | : |
Author | : Kinsuk Giri |
Publisher | : Springer |
Total Pages | : 148 |
Release | : 2014-08-30 |
Genre | : Science |
ISBN | : 3319095404 |
The work developed in this thesis addresses very important and relevant issues of accretion processes around black holes. Beginning by studying the time variation of the evolution of inviscid accretion discs around black holes and their properties, the author investigates the change of the pattern of the flows when the strength of the shear viscosity is varied and cooling is introduced. He succeeds to verify theoretical predictions of the so called Two Component Advective Flow (TCAF) solution of the accretion problem onto black holes through numerical simulations under different input parameters. TCAF solutions are found to be stable. And thus explanations of spectral and timing properties (including Quasi-Period Oscillations, QPOs) of galactic and extra-galactic black holes based on shocked TCAF models appear to have a firm foundation.
Author | : Kenneth B. Henisey |
Publisher | : |
Total Pages | : 70 |
Release | : 2011 |
Genre | : |
ISBN | : 9781267020055 |
Light curves from accreting black hole systems exhibit variability which has neither been conclusively explained by analytic models nor seen in numerical simulations of these flows. Until recently, these computational studies have uniformly assumed alignment between the angular momenta of a black hole and its accretion disk. In contrast, observational data suggests that these tilted configurations may exist in real astrophysical systems and theoretical work indicates that tilt is accompanied by disk eccentricity and warp capable of exciting trapped diskoseismological modes. This dissertation analyzes the spatial and temporal behavior of fluid in fully three-dimensional, general relativistic, magnetohydrodynamical simulations, the first of their kind, of both tilted and untilted black hole accretion flows. We uncover characteristically greater variability in tilted simulations at frequencies similar to those predicted by the formalism of trapped modes, but ultimately conclude that its spatial structure is inconsistent with a modal interpretation. We find instead that over-dense clumps orbiting on roughly Keplerian trajectories appear generically in our global simulations independent of tilt and that these blobs give rise to acoustic wakes inside and outside of their corotation radius. Our three dimensional analysis of the flow yields two additional results. First, we confirm the strongly asymmetric nature of the tilted configuration by further describing two previously identified standing shock structures in the background flow; second, we show that these shocks effectively amplify the blob-wake variability and thus explain the increased variability observed in our tilted datasets. Our identification of clumps, wakes, and wake-shock interactions in these tilted, fully general relativistic, magnetohydrodynamical simulations will certainly be relevant to those models which incorporate tilt as a way to explain the observed variability in black hole accretion flow.
Author | : Marek A. Abramowicz |
Publisher | : Cambridge University Press |
Total Pages | : 310 |
Release | : 1998 |
Genre | : Science |
ISBN | : 9780521623629 |
The first comprehensive and up-to-date review of our new understanding of accretion disks around black holes - with chapters from experts from around the world.
Author | : |
Publisher | : |
Total Pages | : 30 |
Release | : 2014 |
Genre | : |
ISBN | : |
Author | : Marek A. Abramowicz |
Publisher | : Cambridge University Press |
Total Pages | : 308 |
Release | : 2010-08-26 |
Genre | : Science |
ISBN | : 9780521152952 |
This authoritative volume is the first to present a comprehensive and up-to-date review of our new understanding of accretion disks around black holes. Interest in black hole accretion disks has undergone a renaissance in recent years because of developments in three complementary areas: theoretical modeling of relativistic plasmas, numerical simulations with supercomputers, and observational tests now possible using new observatories such as the Japanese X-ray satellite, ASCAR. This volume presents review papers on all these topics from leading world authorities who gathered at an international conference in Reykjavik, Iceland. The authors are M. Abramowicz, P. Artymowicz, A. Brandenburg, G. Bjornsson, P. Charles, A. Fabian, J. Krolik, J.-P. Lasota, G. Madejski, R. Narayan, I. Novikov, J. Papaloizou, J. Poutanen, J. Pringle, M. Rees, E. Spiegel, R. Svensson, P. Witta. This timely volume provides an up-to-date review of the theory of black hole accretion disks for graduate students and researchers in astrophysics and theoretical physics.
Author | : Brian Punsly |
Publisher | : Springer Science & Business Media |
Total Pages | : 399 |
Release | : 2008-12-15 |
Genre | : Science |
ISBN | : 3540769579 |
Black hole gravitohydromagnetics (GHM) is developed from the rudiments to the frontiers of research in this book. GHM describes plasma interactions that combine the effects of gravity and a strong magnetic field, in the vicinity (ergosphere) of a rapidly rotating black hole. This topic was created in response to the astrophysical quest to understand the central engines of radio loud extragalactic radio sources. The theory describes a "torsional tug of war" between rotating ergospheric plasma and the distant asymptotic plasma that extracts the rotational inertia of the black hole. The recoil from the struggle between electromagnetic and gravitational forces near the event horizon is manifested as a powerful pair of magnetized particle beams (jets) that are ejected at nearly the speed of light. This second edition of the book is updated throughout and contains a completely new chapter discussing state of the art and results of numerical simulations of ergospheric disk jets occurring in magnetohydrodynamic accretion flows.
Author | : Maurizio Falanga |
Publisher | : Springer |
Total Pages | : 0 |
Release | : 2014-10-29 |
Genre | : Science |
ISBN | : 9781493922260 |
Provides a comprehensive summary on the physical models and current theory of black hole accretion, growth and mergers, in both the supermassive and stellar-mass cases. This title reviews in-depth research on accretion on all scales, from galactic binaries to intermediate mass and supermassive black holes. Possible future directions of accretion are also discussed. The following main themes are covered: a historical perspective; physical models of accretion onto black holes of all masses; black hole fundamental parameters; and accretion, jets and outflows. An overview and outlook on the topic is also presented. This volume summarizes the status of the study of astrophysical black hole research and is aimed at astrophysicists and graduate students working in this field. Originally published in Space Science Reviews, Vol 183/1-4, 2014.
Author | : Hagai Netzer |
Publisher | : Cambridge University Press |
Total Pages | : 369 |
Release | : 2013-09-16 |
Genre | : Science |
ISBN | : 1107021510 |
A comprehensive introduction to the theory underpinning our study of active galactic nuclei and the ways we observe them.
Author | : Javiera M. Guedes |
Publisher | : |
Total Pages | : 414 |
Release | : 2011 |
Genre | : |
ISBN | : |