The Coexistence of Classical Bulges and Disky Pseudobulges in Early-Type Disk Galaxies

Abstract

Close examination of so-called "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.

arXiv commentpdflatex, 4 pages, 2 PDF figures; uses iaus.cls (included). To appear in the proceedings of IAU Symposium 245: Formation and Evolution of Galaxy Bulges, ed. M. Bureau, A. Athanassoula, and B. Barbuy

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