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We present results on the intrinsic brightness temperature of a sample ofcompact radio sources observed at 86 GHz using the Global Millimeter VLBIArray. We use the observed brightness temperatures at 86 GHz and the observedsuperluminal motions at 15 GHz for the sample in order to constrain thecharacteristic intrinsic brightness temperature of the sample. With astatistical method for studying the intrinsic brightness temperatures ofinnermost jet cores of compact radio sources, assuming that all sources havethe same intrinsic brightness temperature and the viewing angles of their jetsare around the critical value for the maximal apparent speed, we find thatsources in the sample have a characteristic intrinsic brightness temperature,$T_{\rm 0} = 4.8^{+2.6}_{-1.5}\times 10^{9}$ K, which is lower than theequipartition temperature for the condition that the particle energy equals tothe magnetic field energy. Our results suggest that the VLBI cores seen at 86GHz may be representing a jet region where the magnetic field energy dominatesthe total energy in the jet.

Intrinsic Brightness Temperature of Compact Radio Sources at 86 GHz