Quasi-periodic oscillations in bright galactic-bulge X-ray sources

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Galactic Bulge, Neutron Stars, Stellar Oscillations, X Ray Astronomy, X Rays, Astrophysics, Earth Magnetosphere, Galactic Clusters, Galactic Radiation, Magnetic Stars

Scientific paper

Quasi-periodic oscillations with frequencies in the range 5 - 50 Hz have recently been discovered in X-rays from two bright galactic-bulge sources and Sco X-1. The authors propose that these sources are weakly magnetic neutron stars accreting from disks in which the plasma is clumped. The interaction of the magnetosphere with clumps in the inner disk modulates the accretion rate, causing oscillations in the X-ray flux with many of the observed properties.

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