BLAES, Omer, Eva ŠRÁMKOVÁ, Marek ABRAMOWICZ, Wlodel KLUZNIAK and Ulf TORKELSSON. Epicyclic oscillations of fluid bodies: Newtonian nonslender torus. Astrophysical Journal. CHICAGO: UNIV CHICAGO PRESS, 2007, vol. 665, No 1, p. 642-653. ISSN 0004-637X. Available from: https://dx.doi.org/10.1086/519782. |
Other formats:
BibTeX
LaTeX
RIS
@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 and Ulf TORKELSSON. Epicyclic oscillations of fluid bodies: Newtonian nonslender torus. \textit{Astrophysical Journal}. CHICAGO: UNIV CHICAGO PRESS, 2007, vol.~665, No~1, p.~642-653. ISSN~0004-637X. Available from: https://dx.doi.org/10.1086/519782.
|