Detailed Information on Publication Record
2007
Humpy LNRF-velocity profiles in accretion discs orbiting almost extreme Kerr black holes. A possible relation to quasi-periodic oscillations
SLANÝ, Petr, Zdeněk STUCHLÍK and Gabriel TÖRÖKBasic information
Original name
Humpy LNRF-velocity profiles in accretion discs orbiting almost extreme Kerr black holes. A possible relation to quasi-periodic oscillations
Authors
Edition
Astronomy & Astrophysics, FR - Francouzská republika, 2007, 0004-6361
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Confidentiality degree
není předmětem státního či obchodního tajemství
Organization unit
Faculty of Philosophy and Science in Opava
UT WoS
000244229900002
Keywords in English
black hole physics, accretion disks, relativity
Tags
Tags
International impact
Links
MSM4781305903, plan (intention).
Změněno: 7/12/2020 10:23, Mgr. Pavlína Jalůvková
Abstract
V originále
Change of sign of the LNRF-velocity gradient has been found for accretion discs orbiting rapidly rotating Kerr black holes with spin a > 0.9953 for Keplerian discs and a > 0.99979 for marginally stable thick discs. Aschenbach (2004) has identified the maximal rate of change of the orbital velocity within the "humpy" profile with a locally defined critical frequency of disc oscillations, but it has been done in a coordinate-dependent form. We define the critical "humpy" frequency H in general relativistic, coordinate independent form, and relate the frequency defined in the LNRF to distant observers. At radius of its definition, so-called "humpy" radius r_h, the "humpy" frequency H is compared to the radial (R) and vertical (V) epicyclic frequencies andthe orbital frequency of the disc.