Quasi-Periodic Oscillations in Accretion Discs
نویسندگان
چکیده
منابع مشابه
Corotational Instability of Inertial-Acoustic Modes in Black Hole Accretion Discs and Quasi-Periodic Oscillations
We study the global stability of non-axisymmetric p-modes (also called inertial-acoustic modes) trapped in the inner-most regions of accretion discs around black holes. We show that the lowest-order (highest-frequency) p-modes, with frequencies ω = (0.5− 0.7)mΩISCO (where m = 1, 2, 3, · · · is the azimuthal wave number, ΩISCO is the disc rotation frequency at the Inner-most Stable Circular Orbi...
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We have performed numerical simulations of a radially perturbed “accretion” torus around a black hole or neutron star and find that the torus performs radial and vertical motions at the appropriate epicyclic frequencies. We find clear evidence that vertical motions are excited in a nonlinear resonance when the applied perturbation is periodic in time. The strongest resonant response occurs when...
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SANDIP K. CHAKRABARTI, D. DEBNATH, P.S. PAL, A. NANDI, R. SARKAR, M.M. SAMANTA, P.J. WIITA, H. GHOSH and D. SOM S. N. Bose National Centre for Basic Sciences, JD-Block, Sector III, Salt Lake, Kolkata, 700 098, India. E-mail:[email protected] 2 Centre for Space Physics, Chalantika 43, Garia Station Rd., Kolkata 700084, India. 3 Department of Physics & Astronomy, Georgia State University, PO B...
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We present results of several numerical simulations of two dimensional axisymmetric accretion flows around black holes using the Smoothed Particle Hydrodynamics (SPH). We consider both stellar black holes and as well as supermassive black holes. We assume bremsstrahlung to be the only source of cooling as it is simpler to implement in numerical simulations. We observe that due to both radial an...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 2002
ISSN: 0252-9211
DOI: 10.1017/s0252921100017164