The upper kHz QPO: a gravitationally lensed vertical oscillation

Details The upper kHz QPO: a gravitationally lensed vertical oscillation The upper kHz QPO: a gravitationally lensed vertical oscillation

2004-06-25

arxiv.org/abs/astro-ph/0406586v1

Astrophys.J. 617 (2004) L45-L48

Astronomy and Astrophysics

Astrophysics

8 p., 4 figs

Scientific paper

10.1086/427167

We show that a luminous torus in the Schwarzschild metric oscillating along its own axis gives rise to a periodically varying flux of radiation, even though the source of radiation is steady and perfectly axisymmetric. This implies that the simplest oscillation mode in an accretion flow, axisymmetric up-and-down motion at the meridional epicyclic frequency, may be directly observable when it occurs in the inner parts of accretion flow around neutron stars and black holes. The high-frequency modulations of the X-ray flux observed in low-mass X-ray binaries at two frequencies (twin kHz QPOs) could then be a signature of strong gravity both because radial and meridional oscillations have different frequencies in non-Newtonian gravity, and because strong gravitational deflection of light rays causes the flux of radiation to be modulated at the higher frequency.

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