Super-spinning compact objects and models of high-frequency quasi-periodic oscillations observed in ...

@article{29866,
   author = {Kotrlová, Andrea and Šrámková, Eva and Török, Gabriel and Stuchlík, Zdeněk and Goluchová, Kateřina},
   article_number = {November},
   doi = {http://dx.doi.org/10.1051/0004-6361/201730585},
   keywords = {X-rays: binaries; black hole physics; accretion; accretion disks},
   language = {eng},
   issn = {0004-6361},
   journal = {Astronomy & Astrophysics},
   title = {Super-spinning compact objects and models of high-frequency quasi-periodic oscillations observed in Galactic microquasars II. Forced resonances},
   url = {https://www.aanda.org/articles/aa/abs/2017/11/aa30585-17/aa30585-17.html},
   volume = {607},
   year = {2017}
}

TY  - JOUR
ID  - 29866
AU  - Kotrlová, Andrea - Šrámková, Eva - Török, Gabriel - Stuchlík, Zdeněk - Goluchová, Kateřina
PY  - 2017
TI  - Super-spinning compact objects and models of high-frequency quasi-periodic oscillations observed in Galactic microquasars II. Forced resonances
JF  - Astronomy & Astrophysics
VL  - 607
IS  - November
SP  - „A69-1“-„A69-8“
EP  - „A69-1“-„A69-8“
SN  - 00046361
KW  - X-rays: binaries
KW  - black hole physics
KW  - accretion
KW  - accretion disks
UR  - https://www.aanda.org/articles/aa/abs/2017/11/aa30585-17/aa30585-17.html
L2  - https://www.aanda.org/articles/aa/abs/2017/11/aa30585-17/aa30585-17.html
N2  - In our previous work ( Paper I) we applied several models of high-frequency quasi-periodic oscillations (HF QPOs) to estimate the spin of the central compact object in three Galactic microquasars assuming the possibility that the central compact body is a superspinning object ( or a naked singularity) with external spacetime described by Kerr geometry with a dimensionless spin parameter a equal to cJ/GM^(2) > 1. Here we extend our consideration, and in a consistent way investigate implications of a set of ten resonance models so far discussed only in the context of a < 1. The same physical arguments as in Paper I are applied to these models, i.e. only a small deviation of the spin estimate from a = 1, a greater than or similar to 1, is assumed for a favoured model. For five of these models that involve Keplerian and radial epicyclic oscillations we find the existence of a unique specific QPO excitation radius. Consequently, there is a simple behaviour of dimensionless frequency M x nu_(U)(a) represented by a single continuous function having solely one maximum close to a greater than or similar to 1. Only one of these models is compatible with the expectation of a greater than or similar to 1. The other five models that involve the radial and vertical epicyclic oscillations imply the existence of multiple resonant radii. This signifies a more complicated behaviour of M x nu_(U)(a) that cannot be represented by single functions. Each of these five models is compatible with the expectation of a greater than or similar to 1.
ER  - 

KOTRLOVÁ, Andrea, Eva ŠRÁMKOVÁ, Gabriel TÖRÖK, Zdeněk STUCHLÍK a Kateřina GOLUCHOVÁ. Super-spinning compact objects and models of high-frequency quasi-periodic oscillations observed in Galactic microquasars II. Forced resonances. \textit{Astronomy \&{} Astrophysics}. roč.~607, November, s.~„A69-1“-„A69-8“, 8 s. ISSN~0004-6361. doi:10.1051/0004-6361/201730585. 2017.