QPOs are often caused by blobs of hot gas spinning tightly around neutron stars. The frequency of the oscillation depends on the orbital radius and the mass of the neutron star. However, the QPOs in J1655-40 have a frequency greater than what should be physically allowed. To explain the phenomenon, Strohmayer concludes the rotation of the black hole is speeding up the QPOs. Interestingly, spinning black holes have been known for some time.
Scientists believe only spinning black holes can produce such superfast jets.
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