The Crab Pulsar (PSR B0531+21) is a supernova remnant located in the Crab Nebula, discovered in 1969. The pulsar is roughly 10 km in diameter and rotates once every 33 milliseconds, or 30 times each second. The beams of radiation it emits interact with the nebular gases to produce complex patterns of wind and fluorescence. The most dynamic feature in the inner part of the nebula is the point where one of the pulsar's polar jets slams into the surrounding material forming a Shock wave. The shape and position of this feature shifts rapidly, with the equatorial wind appearing as a series of wisp-like features that steepen, brighten, then fade as they move away from the pulsar to well out into the main body of the nebula. The Crab Nebula is often used as a calibration source in X-ray astronomy. It is very bright in X-rays and the flux density and Electromagnetic spectrum are known to be constant, with the exception of the pulsar itself. The pulsar provides a strong periodic signal that is used to check the timing of the X-ray detectors. In X-ray astronomy, 'Crab' and 'milliCrab' are sometimes used as units of flux density. Very few X-ray sources ever exceed one Crab in brightness. Pulsars
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Crab Pulsar
The Crab Pulsar (PSR B0531+21) is a supernova remnant located in the Crab Nebula, discovered in 1969. The pulsar is roughly 10 km in diameter and rotates once every 33 milliseconds, or 30 times each second. The beams of radiation it emits interact with the nebular gases to produce complex patterns of wind and fluorescence. The most dynamic feature in the inner part of the nebula is the point where one of the pulsar's polar jets slams into the surrounding material forming a Shock wave. The shape and position of this feature shifts rapidly, with the equatorial wind appearing as a series of wisp-like features that steepen, brighten, then fade as they move away from the pulsar to well out into the main body of the nebula. The Crab Nebula is often used as a calibration source in X-ray astronomy. It is very bright in X-rays and the flux density and Electromagnetic spectrum are known to be constant, with the exception of the pulsar itself. The pulsar provides a strong periodic signal that is used to check the timing of the X-ray detectors. In X-ray astronomy, 'Crab' and 'milliCrab' are sometimes used as units of flux density. Very few X-ray sources ever exceed one Crab in brightness. Pulsars
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