Physics
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...473..178p&link_type=abstract
Astrophysical Journal v.473, p.178
Physics
15
Black Hole Physics, Galaxies: Jets, Galaxies: Nuclei, Magnetohydrodynamics: Mhd
Scientific paper
This article presents hydromagnetic theory that is capable of explaining the fundamental physics responsible for correlations between spectral shape in the radio to submillimeter band with other observable characteristics of core-dominated radio sources presented in a companion paper. The basic model consists of a rotating black hole surrounded by an accretion disk. Large-scale magnetic flux threads the accretion disk, the event horizon of the black hole, and the ergospheric gap in between. It is concluded that there are two dominant components, the ergospheric disk-riven wind and the horizon magnetosphere-driven wind. For the first time, all three potential magnetized plasma wind generation regions are studied in unison instead of in isolation. This drastically changes one's interpretation of the achievable energy flux driven by a particular power source. A key new result is that quite generally, the accretion disk- riven wind is much weaker than the ergosphere-driven wind in powerful radio sources. The ergospheric disk-riven wind is by far the most powerful energy source associated with rapidly rotating black holes. It is argued to be prominent in quasars, and it is the primary conduit of energy for the VLBI jet and the large-scale radio emission in these sources. The horizon magnetospheric wind is associated with blazar activity and γ-ray emission. In the theory, BL Lac objects contain "slow" rotating black holes in general and have a weak ergospheric disk- riven wind. Thus, the horizon magnetosphere-driven wind is prominent in BL Lac objects in both the VLBI jet and the unresolved core. This two- component model not only explains the spectral correlations found in the companion paper, but it predicts evolutionary effects in extragalactic radio sources that agree with observation, including evolution in the 3CR catalog of radio sources, and the redshift distribution of BL Lac objects and quasars. It also presents plausible explanations of the maximum intrinsic luminosities detected in FR II radio sources as well as FR I radio sources.
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