Oscillations of Thick Accretion Discs Around Black Holes

Abstract

We present a numerical study of the response of a thick accretion disc to a localized, external perturbation with the aim of exciting internal modes of oscillation. We find that the perturbations efficiently excite global modes recently identified as acoustic p--modes, and closely related to the epicyclic oscillations of test particles. The two strongest modes occur at eigenfrequencies which are in a 3:2 ratio. We have assumed a constant specific angular momentum distribution within the disc. Our models are in principle scale--free and can be used to simulate accretion tori around stellar or super massive black holes.

4 pages, 4 figures, accepted for publication as a letter in the Monthly Notices of the Royal Astronomical Society

Cited by in corpus (9)

• Accurate evolutions of inspiralling neutron-star binaries: prompt and delayed collapse to black hole
• Harmonic QPOs and Thick Accretion Disk Oscillations in BL Lac Object AO 0235+164
• Relativistic thick accretion disks: morphology and evolutionary parameters
• Oscillations of tori in the pseudo-Newtonian potential
• A Radio Quasi-periodic Oscillation of 176 day in the Radio-loud Narrow-line Seyfert 1 Galaxy J0849+5108
• Two Transient Quasi-periodic Oscillations in $\gamma$-Ray Emission from the Blazar S4 0954+658
• Multicolour Optical Variability Monitoring of Blazars with High Time Resolution
• A double-period oscillation signal in millimeter emission of the radio galaxy NGC 1275
• Parsec-scale jet precession and a putative supermassive binary black hole system in the blazar AO 0235+164