Published in "Galaxy Evolution: Theory and Observation" (2003), eds. V. Avila-Reese, C. Firmani, C. Frenk, & C. Allen, RevMexAA (SC), 17, 113-120.

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PHYSICAL PROCESSES BEHIND THE MORPHOLOGICAL HUBBLE SEQUENCE

Claudio Firmani 1,2 and Vladimir Avila-Reese 2


Abstract: The study of formation and evolution of galaxies is reviewed, making emphasis on the physical factors which are important to understand the origin of the Hubble sequence. We concentrate on predictions of the hierarchical Cold Dark Matter (CDM) scenario and their confrontation with observations. The mass assembling of the CDM halos, the baryonic processes within them, and the evolution of disks and spheroids are described. The successes and shortcomings are discussed. Disk evolution seems to be a quiescent and extended process driven by the cosmological initial conditions, while spheroids are formed probably in violent events, where several astrophysical processes are competing.


Key words: galaxies: elliptical - galaxies: evolution - galaxies: spirals - cosmology: dark matter


Table of Contents

INTRODUCTION

DARK MATTER PROCESSES

BARYON MATTER PROCESSES

DISKS
Disk models at z = 0
Disk evolution
Drivers of the disk Hubble sequence

SPHEROIDS
Relevant observational properties and correlations
Theoretical aspects

THE HUBBLE SEQUENCE IN THE HIERARCHICAL COSMOGONY
Connecting spheroid formation with QSOs

CONCLUDING REMARKS

REFERENCES



1 Osservatorio Astronomico di Brera, Italy. Back.

2 Instituto de Astronomía, U.N.A.M, México. Back.

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