Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-08-26
New Astron.Rev. 46 (2002) 247-255
Astronomy and Astrophysics
Astrophysics
13 pages, 3 figures; to appear in Life Cycles of Radio Galaxies, ed. J. Biretta et al., New Astronomy Reviews
Scientific paper
10.1016/S1387-6473(01)00189-0
While attempts to unify certain classes of AGN using orientation and environmental effects have been successful, it is widely recognized that intrinsic properties of the accreting black hole system also must play a role in determining the appearance of such an object. In addition to mass and accretion rate, the angular momentum (or spin) of the black hole can play a crucial role in determining the power of a relativistic jet that is generated by magnetohydrodynamic acceleration near the hole. In this paper a scenario is presented, based on accretion theory and recent models of MHD jet production, in which the primary (although not only) parameter differentiating between radio loud and quiet objects is the black hole spin, and that determining quasar vs. radio galaxy is the accretion rate. A surprising number of desirable features result from these simple concepts and the accompanying equations. In addition, there are several testable predictions that can determine whether this grand unification scheme has further merit.
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