Crab (unit)
A Crab is a standard astrophotometrical unit for measurement of the intensity of astrophysical X-ray sources. One Crab is defined as the intensity of the Crab Nebula at the corresponding X-ray photon energy.
A Crab is a standard astrophotometrical unit for measurement of the intensity of astrophysical X-ray sources. One Crab is defined as the intensity of the Crab Nebula at the corresponding X-ray photon energy.
A Crab is a standard astrophotometrical unit for measurement of the intensity of astrophysical X-ray sources. One Crab is defined as the intensity of the Crab Nebula at the corresponding X-ray photon energy.
Source: Wikipedia "Crab (unit)" · CC BY-SA 4.0
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