(Credit: T. Strohmayer)
This figure depicts a burst from the Low Mass X-ray Binary (LMXB)
source 4U 1728-34 and the corresponding power density spectrum (PDS).
For the duration of the burst, we see a quasi-periodic ocsillation
(QPO) around 364 Hz, which current theories attribute to the X-ray
emission from a hot spot on the surface of the spinning neutron star.
This provides the first evidence for a millisecond spin period for a
neutron star which is not a radio pulsar!
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