The Coexistence of Classical Bulges and Disky Pseudobulges in Early-Type Disk Galaxies
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AbstractAbstract. Close examination of “pseudobulges ” in several early-type disk galaxies indicates that they are actually composite structures consisting of both a flattened, kinematically cool disklike structure (“disky pseudobulge”) and a rounder, kinematically hot spheroidal structure (“classical bulge”). This indicates that pseudobulges, thought to form from internal secular evolution, and classical bulges, thought to form from rapid mergers, are not exclusive phenomena: some galaxies can have both.