| BLAES, Omer, Eva ŠRÁMKOVÁ, Marek ABRAMOWICZ, Wlodel KLUZNIAK a Ulf TORKELSSON. Epicyclic oscillations of fluid bodies: Newtonian nonslender torus. Astrophysical Journal. CHICAGO: UNIV CHICAGO PRESS, 2007, roč. 665, č. 1, s. 642-653. ISSN 0004-637X. Dostupné z: https://dx.doi.org/10.1086/519782. |
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@article{41411,
author = {Blaes, Omer and Šrámková, Eva and Abramowicz, Marek and Kluzniak, Wlodel and Torkelsson, Ulf},
article_location = {CHICAGO},
article_number = {1},
doi = {http://dx.doi.org/10.1086/519782},
keywords = {accretion, accretion disks; black hole physics; hydrodynamics; X-rays : binaries},
language = {eng},
issn = {0004-637X},
journal = {Astrophysical Journal},
title = {Epicyclic oscillations of fluid bodies: Newtonian nonslender torus},
volume = {665},
year = {2007}
}
TY - JOUR
ID - 41411
AU - Blaes, Omer - Šrámková, Eva - Abramowicz, Marek - Kluzniak, Wlodel - Torkelsson, Ulf
PY - 2007
TI - Epicyclic oscillations of fluid bodies: Newtonian nonslender torus
JF - Astrophysical Journal
VL - 665
IS - 1
SP - 642-653
EP - 642-653
PB - UNIV CHICAGO PRESS
SN - 0004637X
KW - accretion, accretion disks
KW - black hole physics
KW - hydrodynamics
KW - X-rays : binaries
N2 - We study epicyclic oscillations of fluid tori around black holes ( in the Paczynski-Wiita potential) and derive exact analytic expressions for their radial and vertical eigenfrequencies V-r and V-z to second-order accuracy in the width of the torus. We prove that pressure effects make the eigenfrequencies smaller than those for free particles. However, the particular ratio V-z/V-r = 3/2, which is important for the theory of high-frequency quasi-periodic oscillations (QPOs), occurs when the fluid tori epicyclic frequencies V-r and V-z are about 15% higher than the ones corresponding to free particles. Our results therefore suggest that previous estimates of black hole spins from QPOs have produced values that are too high.
ER -
BLAES, Omer, Eva ŠRÁMKOVÁ, Marek ABRAMOWICZ, Wlodel KLUZNIAK a Ulf TORKELSSON. Epicyclic oscillations of fluid bodies: Newtonian nonslender torus. \textit{Astrophysical Journal}. CHICAGO: UNIV CHICAGO PRESS, 2007, roč.~665, č.~1, s.~642-653. ISSN~0004-637X. Dostupné z: https://dx.doi.org/10.1086/519782.
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