2017A&A...607A..69K


Query : 2017A&A...607A..69K

2017A&A...607A..69K - Astronomy and Astrophysics, volume 607A, 69-69 (2017/11-1)

Super-spinning compact objects and models of high-frequency quasi-periodic oscillations observed in Galactic microquasars. II. Forced resonances.

KOTRLOVA A., SRAMKOVA E., TOROK G., STUCHLIK Z. and GOLUCHOVA K.

Abstract (from CDS):

In our previous work (Paper I, 2014A&A...572A..79K ) 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 super-spinning object (or a naked singularity) with external spacetime described by Kerr geometry with a dimensionless spin parameter a∼cJ/GM2>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≥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 MxνU(a) represented by a single continuous function having solely one maximum close to a≥1. Only one of these models is compatible with the expectation of a≥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 MxνU(a) that cannot be represented by single functions. Each of these five models is compatible with the expectation of a≥1.

Abstract Copyright: © ESO, 2017

Journal keyword(s): X-rays: binaries - black hole physics - accretion, accretion disks - accretion, accretion disks

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1072 0
2 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1759 1
3 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3683 3
4 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2385 0

    Equat.    Gal    SGal    Ecl

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2021.07.27-08:32:58

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