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Clumpy Galaxies in the Early Universe

Published online by Cambridge University Press:  01 August 2006

Debra Meloy Elmegreen
Debra Meloy Elmegreen*
Affiliation:
Dept. of Physics & Astronomy, Vassar College, Poughkeepsie, NY 12604USA email: elmegreen@vassar.edu
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Abstract

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Clumpy galaxies are prominent in the early Universe. We present morphological and photometric properties of a wide range of galaxy types and their star-forming clumps in the Hubble Ultra Deep Field. Sizes, scale lengths, and scale heights suggest that galaxies grow by a factor of 2 from z = 4 to the present, and that thick disks are present in the early Universe. The largest clumps of star formation are 107–109M⊙ in different galaxies, much more massive than large star-forming complexes in local galaxies. Dissolved clumps may account for both the exponential disks and the early thick disks of spirals and proto-spiral galaxies.

Keywords

galaxies: structuregalaxies: evolutiongalaxies: high-redshift

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