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The upper kHz QPO: a gravitationally lensed vertical oscillation | | M. Bursa
; M. A. Abramowicz
; V. Karas
; W. Kluzniak
; | | Date: |
25 Jun 2004 | | Journal: | Astrophys.J. 617 (2004) L45-L48 DOI: 10.1086/427167 | | Subject: | astro-ph | | Abstract: | 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. | | Source: | arXiv, astro-ph/0406586 | | Services: | Forum | Review | PDF | Favorites | |
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