In press; notes to the PhD School of Astrophysics "F. Lucchin", held in Erice, Italy, September 2011; G. Bono, M. Zoccali (eds.)
astro-ph/1208.2295

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GALAXY BULGES AND ELLIPTICAL GALAXIES - LECTURE NOTES

Dimitri A. Gadotti


European Southern Observatory
Casilla 19001, Santiago 19, Chile

Abstract: Our knowledge on the central components of disk galaxies has grown substantially in the past few decades, particularly so in the last. This frantic activity and the complexity of the subject promote confusion in the community. In these notes, I discuss the concept of galactic bulge and its different flavors. I also address fundamental scaling relations and the bulge-elliptical galaxy connection, their central black holes and formation models. In particular, I aim at conveying three important notions: (i): box/peanuts are just the inner parts of bars; (ii): the physical reality of two different families of bulges is evident; and (iii): at the high mass end, at least, classical bulges are not just scaled down ellipticals surrounded by disks.

Keywords: (Galaxies:) bulges - Galaxies: elliptical and lenticular, cD - Galaxies: evolution - Galaxies: formation - Galaxies: structure


Table of Contents

INTRODUCTION

WHAT IS A BULGE?

BULGE TYPES

RECOGNIZING DISK-LIKE BULGES

SCALING RELATIONS

SUPERMASSIVE BLACK HOLES AND THEIR SCALING RELATIONS

BULGE FORMATION MODELS

REFERENCES

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