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<p>of an AGN depend on several properties such as the mass of the central black hole, the rate of gas accretion onto the black hole, the orientation of the <a href="page.php?w=accretion_disk">accretion disk</a>, the degree of <a href="page.php?w=Extinction_%28astronomy%29">obscuration</a> of the nucleus by <a href="page.php?w=Cosmic_dust">dust</a>, and presence or absence of <a href="page.php?w=Astrophysical_jet">jets</a>. Numerous subclasses of AGN have been defined on the basis of their observed characteristics; the most powerful AGN are classified</p><p>
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