Ten Billion Years of Galaxy Evolution

Abstract

Observations in the Hubble Deep Fields have been used to study the evolution of galaxy morphology over time. The majority of galaxies with z < 1 are seen to be disk like, whereas most objects with z > 2 appear to be either chaotic or centrally concentrated ``blobs''. Such blobs might be the ancestral objects of ellipticals or of galaxy bulges. About 1/3 of objects with z > 2 appear to be in the process of merging. The region with 1 < z < 2 marks an important transition in the global history of star formation from a merger dominated regime at z > 2, to one at z < 1 in which most star formation takes place in galactic disks. It is speculated that the break in the Madau plot at z sim 1.5 might be related to the transition from merger-dominated star formation at z > 2 to disk-dominated star formation at at z < 1.

19 pages. 1 figure. To be published in the August 2002 issue of PASP

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• Two-phase galaxy evolution: the cosmic star-formation histories of spheroids and discs
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• Modeling the Redshift Evolution of the Normal Galaxy X-ray Luminosity Function
• Optical and Near-Infrared Spectroscopy of a High-Redshift, Hard X-ray Emitting Spiral Galaxy
• Tidal-induced lopsidedness in Magellanic-type galaxies
• On the global structure of distant galactic disks
• The FALCON concept: multi-object adaptive optics and atmospheric tomography for integral field spectroscopy. Principles and performances on an 8 meter telescope
• Searching for Environmental Effects on Galaxy Kinematics in Groups and Clusters at z~1 from the ORELSE Survey
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• Relationship between Hubble type and spectroscopic class in local galaxies
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• Studying distant galaxies: A Handbook of Methods and Analyses
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• The MOSDEF Survey: Probing Resolved Stellar Populations at $z\sim 2$ Using a New Bayesian-defined Morphology Metric Called Patchiness
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• Observational Comparison of Star Formation in Different Galaxy Types