The Coexistence of Classical Bulges and Disky Pseudobulges in Early-Type Disk Galaxies
arXiv:0709.3793 · doi:10.1017/S1743921308017419
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.
pdflatex, 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