Summary - - Radio galaxy / Seyfert 2 Galaxy [13] Unified...

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Summary These galaxies can be broadly summarised by the following table: Differences between active galaxy types and normal galaxies. Galaxy Type Active Nuclei Emissio n Lines X-rays Excess of Strong Radio Jets Variabl e Radio loud Narrow Broad UV Far- IR Normal no weak none weak none none none none no no Starburst no yes no some no yes some no no no Seyfert I yes yes yes some some yes few no yes no Seyfert II yes yes no some some yes few yes yes no Quasar yes yes yes some yes yes some some yes 10% Blazar yes no some yes yes no yes yes yes yes BL Lac yes no none/faint yes yes no yes yes yes yes OVV yes no stronger than BL Lac yes yes no yes yes yes yes Radio galaxy yes some some some some yes yes yes yes yes Unification
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Unification by viewing angle. From bottom to top: down the jet - Blazar , at an angle to the jet - Quasar / Seyfert 1 Galaxy , at 90 degrees from the jet
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Unformatted text preview: - Radio galaxy / Seyfert 2 Galaxy [13] Unified models of AGN unite two or more classes of objects, based on the traditional observational classifications, by proposing that they are really a single type of physical object observed under different conditions. The currently favoured unified models are 'orientation-based unified models' meaning that they propose that the apparent differences between different types of objects arise simply because of their different orientations to the observer. For an overview of these see [14] and, [15] though some details in the discussion below have emerged since these reviews were written...
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Summary - - Radio galaxy / Seyfert 2 Galaxy [13] Unified...

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