Ecole Evry Schatzman 2010: Star Formation in the Local Universe.
astro-ph/1101.3113

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STAR FORMATION DURING GALAXY FORMATION

Bruce G. Elmegreen


IBM T. J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, New York 10598 USA


Abstract: Young galaxies are clumpy, gas-rich, and highly turbulent. Star formation appears to occur by gravitational instabilities in galactic disks. The high dispersion makes the clumps massive and the disks thick. The star formation rate should be comparable to the gas accretion rate of the whole galaxy, because star formation is usually rapid and the gas would be depleted quickly otherwise. The empirical laws for star formation found locally hold at redshifts around 2, although the molecular gas consumption time appears to be smaller, and mergers appear to form stars with a slightly higher efficiency than the majority of disk galaxies.


Table of Contents

INTRODUCTION

WHAT ARE THE CLUMPY TYPES?

MERGERS

CLUMP CLUSTER PROPERTIES

WORKING MODEL

STREAM-FED DISKS

LOCAL ANALOGS OF CLUMPY GALAXIES

WHAT SHOULD A MODEL OF STAR FORMATION BE FOR HIGH REDSHIFT GALAXIES?

COMPARISON OF STAR FORMATION MODELS

SUMMARY

REFERENCES

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