Kilohertz quasi-periodic oscillations in accreting neutron stars: a diagnostic of the inner few kilometers

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

With the Rossi X-ray Timing Explorer (RXTE) quasi-periodic oscillations have been discovered in the X-ray flux of accreting neutron stars with frequencies up to ~1200 Hz. These oscillation likely originate in the regions of the accretion flow where general relativity in the strong-field regime is required to adequately describe the motion of the accreting matter, and may be due to orbital motion around the neutron star with orbital radii of ~15 km. Possibly associated phenomena have been seen in accreting stellar mass black hole candidates. I review the phenomenology and discuss to what extent these phenomena can be used to probe strong-field GR.

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