around the black hole, the synchrotron radiation occurs for orbits close to the photon sphere where the motion is in the ultra-relativistic regime.

Types

Usually called synchrotron radiation, it can be divided into three types depending on the energy of electrons:
* Cyclotron radiation: non-relativistic electrons (? ? 1).
* Gyrosynchrotron radiation or gyro-magnetic radiation: mildly relativistic electrons

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