2011A&A...531A..59T


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET18:01:06

2011A&A...531A..59T - Astronomy and Astrophysics, volume 531A, 59-59 (2011/7-1)

Confronting the models of 3:2 quasiperiodic oscillations with the rapid spin of the microquasar GRS 1915+105.

TOEROEK G., KOTRLOVA A., SRAMKOVA E. and STUCHLIK Z.

Abstract (from CDS):

Spectral fitting of the spin a=cJ/GM2 in the microquasar GRS 1915+105 estimate values higher than a=0.98. However, there are certain doubts about this (nearly) extremal number. Confirming a high value of a>0.9 would have significant concequences for the theory of high-frequency quasiperiodic oscillations (HF QPOs). Here we discuss its possible implications assuming several commonly used orbital models of 3:2 HF QPOs. We show that the estimate of a>0.9 is almost inconsistent with two hot-spot (relativistic precession and tidal disruption) models and the warped disc resonance model. In contrast, we demonstrate that the epicyclic resonance and discoseismic models assuming the c- and g-modes are favoured. We extend our discussion to another two microquasars that display the 3:2 HF QPOs. The frequencies of these QPOs scale roughly inversely to the microquasar masses, and the differences in the individual spins, such as a=0.9 compared to a=0.7, represent a generic problem for most of the discussed geodesic 3:2 QPO models. To explain the observations of all the three microquasars by one unique mechanism, the models would have to accommodate very large non-geodesic corrections.

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)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1001 0
2 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1672 1
3 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2237 0

    Equat.    Gal    SGal    Ecl

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2019.12.11-18:01:06

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