Models of high-frequency quasi-periodic oscillations and black hole spin estimates in Galactic microquasars

0539765 - ASÚ 2021 RIV FR eng J - Článek v odborném periodiku
Kotrlová, J. - Šrámková, E. - Török, G. - Goluchová, K. - Horák, Jiří - Straub, O. - Lančová, D. - Stuchlík, Z. - Abramowicz, M. A.
Models of high-frequency quasi-periodic oscillations and black hole spin estimates in Galactic microquasars.
Astronomy & Astrophysics. Roč. 643, October (2020), č. článku A31. ISSN 0004-6361. E-ISSN 1432-0746
Grant CEP: GA ČR GA17-16287S; GA MŠMT LTI17018
Institucionální podpora: RVO:67985815
Klíčová slova: X-rays binaries * black hole physics * accretion disks
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.803, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1051/0004-6361/201937097

We explore the influence of nongeodesic pressure forces present in an accretion disc on the frequencies of its axisymmetric and nonaxisymmetric epicyclic oscillation modes. We discuss its implications for models of high-frequency quasi-periodic oscillations (QPOs), which have been observed in the X-ray flux of accreting black holes (BHs) in the three Galactic microquasars, GRS 1915+105, GRO J1655-40, and XTE J1550-564. We focus on previously considered QPO models that deal with low-azimuthal-number epicyclic modes, |m| <= 2, and outline the consequences for the estimations of BH spin, a is an element of [0, 1]. For four out of six examined models, we find only small, rather insignificant changes compared to the geodesic case. For the other two models, on the other hand, there is a significant increase of the estimated upper limit on the spin.
Trvalý link: http://hdl.handle.net/11104/0317467