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We discuss here a limit on the maximum brightness temperature achievable foran incoherent synchrotron radio source. This limit, commonly referred to in theliterature as an inverse Compton limit, prescribes that the brightnesstemperature for an incoherent synchrotron radio source may not exceed ~10^{12}K, a fact known from observations. However one gets a somewhat tighter limit onthe brightness temperatures, T_{b}~10^{11.5} K, independent of the inverseCompton effects, if one employs the condition of equipartition of energy inmagnetic fields and relativistic particles in a synchrotron radio source. Prosand cons of the two brightness temperature limits are discussed.

Maximum brightness temperature for an incoherent synchrotron radio source