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

@article{42725,
   author = {Kotrlová, Andrea and Stuchlík, Zdeněk and Šrámková, Eva and Török, Gabriel},
   article_location = {FR - Francouzská republika},
   article_number = {December},
   doi = {http://dx.doi.org/10.1051/0004-6361/201424407},
   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},
   url = {http://www.aanda.org/articles/aa/abs/2014/12/aa24407-14/aa24407-14.html},
   volume = {572},
   year = {2014}
}

TY  - JOUR
ID  - 42725
AU  - Kotrlová, Andrea - Stuchlík, Zdeněk - Šrámková, Eva - Török, Gabriel
PY  - 2014
TI  - Super-spinning compact objects and models of high-frequency quasi-periodic oscillations observed in Galactic microquasars
JF  - Astronomy & Astrophysics
VL  - 572
IS  - December
SP  - "A79 - 1"-"A79 - 6"
EP  - "A79 - 1"-"A79 - 6"
SN  - 00046361
KW  - X-rays: binaries
KW  - black hole physics
KW  - accretion, accretion disks
UR  - http://www.aanda.org/articles/aa/abs/2014/12/aa24407-14/aa24407-14.html
N2  - We have previously applied several models of high-frequency quasi-periodic oscillations (HF QPOs) to estimate the spin of the central Kerr black hole in the three Galactic microquasars, GRS 1915+105, GRO J1655-40, and XTE J1550-564. Here we explore the alternative possibility that the central compact body is a super-spinning object (or a naked singularity) with the external space-time described by Kerr geometry with a dimensionless spin parameter a equiv cJ/GM^2 > 1. We calculate the relevant spin intervals for a subset of HF QPO models considered in the previous study. Our analysis indicates that for all but one of the considered models there exists at least one interval of a > 1 that is compatible with constraints given by the ranges of the centralcompact object mass independently estimated for the three sources. For most of the models, the inferred values of a are several times higher than the extreme Kerr black hole value a = 1. These values may be too high since the spin of supe
ER  - 

KOTRLOVÁ, Andrea, Zdeněk STUCHLÍK, Eva ŠRÁMKOVÁ and Gabriel TÖRÖK. Super-spinning compact objects and models of high-frequency quasi-periodic oscillations observed in Galactic microquasars. \textit{Astronomy \&{} Astrophysics}. FR - Francouzská republika, 2014, vol.~572, December, p.~''A79 - 1''-''A79 - 6'', 6 pp. ISSN~0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361/201424407.