1962 C. Susskind 275/2 The visible continuum of the Crab nebula has been accepted as synchrotron emission.
1978 J. M. Pasachoff & M. L. Kutner xxiv. 594 Continuum radio radiation can be generated by any of several processes. One of the most important is synchrotron emission, the process that produces the radiation from Taurus A.