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The structure of the NGC 6251 jet on the milliarcsecond scale is investigatedusing images taken with the European VLBI Network and the Very Long BaselineArray. We detect a structural transition of the jet from a parabolic to aconical shape at a distance of (1-2) x 10^5 times the Schwarzschild radius fromthe central engine, which is close to the sphere of gravitational influence ofthe supermassive black hole (SMBH). We also examine the jet pressure profileswith the synchrotron minimum energy assumption to discuss the physical originof the structural transition. The NGC 6251 jet, together with the M87 jet,suggests a fundamental process of structural transition in the jets of activegalactic nuclei (AGNs). Collimated AGN jets are characterized by their externalgalactic medium, showing that AGN jets interplay with the SMBH and its hostgalaxy.

Structural Transition in the NGC 6251 Jet: An Interplay with the Supermassive Black Hole and Its Host Galaxy