Quasi-periodic oscillations

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In high-energy (X-ray) astronomy, quasi-periodic oscillations (QPOs) refer to the way the X-ray light seems to flicker. Low frequency QPOs may be around 1 hertz, whereas high frequency QPOs maybe around several hundred hertz. High-frequency QPOs are likely from matter racing around a black hole. Low frequency QPOs are less understood, but are more common in binary star systems that include a black hole.

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