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Locating the exact point of origin of the core radiation in active galacticnuclei (AGN) would represent important progress in our understanding ofphysical processes in the central engine of these objects. However, due to ourinability to resolve the region containing both the central compact object andthe jet base, this has so far been difficult. Here, using an analysis in whichthe lack of resolution does not play a significant role, we demonstrate that itmay be impossible even in most radio loud sources for more than a smallpercentage of the core radiation at radio wavelengths to come from the jetbase. We find for 3C279 that $\sim85$ percent of the core flux at 15 GHz mustcome from a separate, reasonably stable, region that is not part of the jetbase, and that then likely radiates at least quasi-isotropically and iscentered on the black hole. The long-term stability of this component alsosuggests that it may originate in a region that extends over many Schwarzschildradii.

The Point of Origin of the Radio Radiation from the Unresolved Cores of Radio-Loud Quasars