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• W2282683197 abstract "The first short part of this review is a general, but very detailed, critique of the literature advocating a class of Seyfert galaxies intrinsically lacking broad emission lines. My conclusion is that there is little or no evidence for such objects. Panchromatic properties of all types of radio loud AGN are then reviewed in detail. Radio galaxies usually show subparsec-scale radio core sources, jets, and a pair of giant radio lobes. The optical spectra sometimes show only relatively weak lines of low-ionization ionic species, and no clear nuclear continuum in the optical or UV region of the spectrum. Some show strong high-ionization narrow lines. Finally, a few radio galaxies add broad bases onto the permitted lines. These spectral categories are the same as those for radio-quiet AGN and quasars. By the 1980s, data from optical polarization and statistics of the radio properties required that many narrow line radio galaxies do in fact produce strong optical/UV continuum. This continuum and the broad line emission are hidden from the line of sight by dusty, roughly toroidal gas distributions, but they are seen in polarized flux. The radio galaxies with hidden quasars are referred to as thermal. Do all radio galaxies harbor hidden quasars? We now know the answer using the radio, infrared, optical and X-ray properties. Near the top of the radio luminosity function, for FRII, GPS, and CSS galaxies, the answer is yes. At somewhat lower luminosities, many do not. At the lowest radio luminosities, most do not. Instead these nonthermal weakly-accreting galaxies manifest their energetic output only as kinetic energy in the form of synchrotron jets. This applies to all types of radio galaxies, big FR II doubles, as well as the small young GPS and CSS sources. Only a few FR I sources are of the thermal type." @default.
• W2282683197 created "2016-06-24" @default.
• W2282683197 creator A5045716557 @default.
• W2282683197 date "2012-10-10" @default.
• W2282683197 modified "2023-09-27" @default.
• W2282683197 title "A panchromatic review of thermal and nonthermal active galactic nuclei" @default.
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