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Galactic bulges: overview

Published online by Cambridge University Press:  01 July 2007

K. C. Freeman
K. C. Freeman*
Affiliation:
Research School of Astronomy & Astrophysics, The Australian National University, Australia
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Abstract

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This overview of galactic bulges begins with a discussion of the various kinds of bulges (classical, boxy/peanut-shaped, pseudo) and their likely formation mechanisms. Other specific topics include the Galactic bar/bulge and its chemical evolution, the bulge of M31, the relation between bulges and metal-poor halos (often lumped together as spheroids), the morphology-density relation and the formation of S0 galaxies, the color-structure bimodality, and scaling laws for bulges. Finally I will briefly discuss the current difficulty of forming bulgeless disk galaxies in ΛCDM.

Keywords

Galaxy: bulgeGalaxy: haloGalaxy: kinematics and dynamicsgalaxies: bulgesgalaxies: formationgalaxies: evolutiongalaxies: Magellanic Cloudsgalaxies: structure

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