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

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

2007-09-24

arxiv.org/abs/0709.3793v1

Astronomy and Astrophysics

Astrophysics

pdflatex, 4 pages, 2 PDF figures; uses iaus.cls (included). To appear in the proceedings of IAU Symposium 245: Formation and E

Scientific paper

10.1017/S1743921308017419

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.

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