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We investigate the extraction of the rotational energy of a black hole underdifferent accreting environment. When the accretion rate is moderate, theaccretion disk consists of an outer thin disk and an inner advection-dominatedaccretion flow. In such a combined disk, the outer thin disk can sustain amagnetic field with moderate strength at the event horizon, leading to theformation of relativistic jets with moderate luminosity and speed via themagnetohrodynamic Penrose process. When the accretion rate increases enough, onthe other hand, the disk becomes geometrically thin near the horizon. In thisslim disk, the denser plasmas can sustain a stronger magnetic field than thatin a combined disk, leading to the formation of jets with greater luminosityand speed via the Blandford-Znajek processs. It is discussed that the formerjets are associated with the Fanaroff-Riley (FR) I galaxies and the latter withFR II galaxies.

Two Types of Ergospheric Jets from Accreting Black Holes: The Dichotomy of Fanaroff-Riley Galaxies