Publication date: Dec 2017
Abstract:
The study of quasi-periodic oscillations (QPOs) of X-ray flux observed
in the stellar-mass black hole binaries can provide a powerful tool for
testing of the phenomena occurring in the strong gravity regime.
Magnetized versions of the standard geodesic models of QPOs can explain
the observationally fixed data from the three microquasars. We perform a
successful fitting of the HF QPOs observed for three microquasars, GRS
1915+105, XTE 1550-564 and GRO 1655-40, containing black holes, for
magnetized versions of both epicyclic resonance and relativistic
precession models and discuss the corresponding constraints of
parameters of the model, which are the mass and spin of the black hole
and the parameter related to the external magnetic field. The estimated
magnetic field intensity strongly depends on the type of objects giving
the observed HF QPOs. It can be as small as 10^{-5} G if electron
oscillatory motion is relevant, but it can be by many orders higher for
protons or ions (0.02-1 G), or even higher for charged dust or such
exotic objects as lighting balls, etc. On the other hand, if we know by
any means the magnetic field intensity, our model implies strong limit
on the character of the oscillating matter, namely its specific charge.
Authors:
Kološ, Martin; Tursunov, Arman; Stuchlík, Zdeněk;