Query : 2014A&A...572A..79K

2014A&A...572A..79K - Astronomy and Astrophysics, volume 572A, 79-79 (2014/12-1)

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


Abstract (from CDS):

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=cJ/GM2>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 central compact 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 superspinars is often assumed to rapidly decrease due to accretion when a≫1. In this context, we conclude that only the epicyclic and the Keplerian resonance model provides estimates that are compatible with the expectation of just a small deviation from a=1.

Abstract Copyright:

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

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 V* V381 Nor HXB 15 50 58.6637920704 -56 28 35.258385000   17.95 16.6     K3III 1146 0
2 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1851 1
3 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2559 0

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