IAU02635
Presentation type requested: ORAL
HIGH-REDSHIFT GALAXIES
Amy J Barger
Department of Astronomy, University of Wisconsin-Madison
The history of star formation in the universe is being mapped by observations at many wavelengths. The dominant episodes of star formation in galaxies were obscured by dust. Submillimeter observations probe these dusty, ultraluminous star formers, but their redshift distribution is still rather uncertain. Optical star formation, by contrast, is well mapped but more difficult to interpret because of extinction. The average properties of optically-selected sources have been deduced at other wavelengths. Star formation rate measurements have been extended to z~7. At recent times substantial star formation is still occurring, primarily in small galaxies. This cosmic downsizing, with comparable light coming from a larger number of less luminous sources, parallels a similar evolution of active galactic nuclei.
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