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The
torus of gas and dust can block part of our view
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Seyfert
2 galaxies: Edge on view
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Only gas well above and below disk is
visible
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See only “slow” gas narrow emission lines
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Seyfert
1 galaxies: Slightly tilted view
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Hot high velocity gas close to black
hole is visible
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High velocities broad
emission lines
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BL
Lac objects: Pole on view
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Looking right down the jet at central
region
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Extremely bright – vary on time
scales of hours
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Quasars: Very active AGN at large distances
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Can barely make out the galaxy
surrounding them
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Were more common in distant past
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