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@article{42082,
author = {Slaný, Petr and Stuchlík, Zdeněk and Török, Gabriel},
article_location = {FR - Francouzská republika},
article_number = {11/2006},
doi = {http://dx.doi.org/10.1051/0004-6361:20066270},
keywords = {black hole physics, accretion disks, relativity},
language = {eng},
issn = {0004-6361},
journal = {Astronomy & Astrophysics},
title = {Humpy LNRF-velocity profiles in accretion discs orbiting almost extreme Kerr black holes. A possible relation to quasi-periodic oscillations},
volume = {463},
year = {2007}
}
TY - JOUR
ID - 42082
AU - Slaný, Petr - Stuchlík, Zdeněk - Török, Gabriel
PY - 2007
TI - Humpy LNRF-velocity profiles in accretion discs orbiting almost extreme Kerr black holes. A possible relation to quasi-periodic oscillations
JF - Astronomy & Astrophysics
VL - 463
IS - 11/2006
SP - 807-816
EP - 807-816
SN - 00046361
KW - black hole physics, accretion disks, relativity
N2 - 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.
ER -
SLANÝ, Petr, Zdeněk STUCHLÍK and Gabriel TÖRÖK. Humpy LNRF-velocity profiles in accretion discs orbiting almost extreme Kerr black holes. A possible relation to quasi-periodic oscillations. \textit{Astronomy \&{} Astrophysics}. FR - Francouzská republika, 2007, vol.~463, 11/2006, p.~807-816, 9 pp. ISSN~0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361:20066270.
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