Stellar Populations in 10 Clump-Cluster Galaxies of the Hubble Ultra Deep Field

Color-color diagrams for the clump and interclump emission in 10 clump-cluster galaxies of the Hubble Ultra Deep Field (UDF) are made from B,V, i, and z images and compared with models to determine redshifts, star formation histories, and galaxy masses. These galaxies are members of a class dominate...

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Bibliographic Details
Published in:The Astrophysical journal 2005-07, Vol.627 (2), p.632-646
Main Authors: Elmegreen, Bruce G, Elmegreen, Debra Meloy
Format: Article
Language:English
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Summary:Color-color diagrams for the clump and interclump emission in 10 clump-cluster galaxies of the Hubble Ultra Deep Field (UDF) are made from B,V, i, and z images and compared with models to determine redshifts, star formation histories, and galaxy masses. These galaxies are members of a class dominated by 5 10 giant clumps, with no exponential disk or bulge. The redshifts are found to be in the range from 1.6 to 3. The clump emission is typically 40% of the total galaxy emission, and the luminous clump mass is 19% of the total galaxy mass. The clump colors suggest declining star formation over the last 0.3 Gyr, while the interclump emission is redder than the clumps, corresponding to a greater age. The clump luminous masses are typically 6 x 10 super(8) M, and their diameters average 1.8 kpc, making their average density 0.2 M pc super(-3).
ISSN:0004-637X
1538-4357
DOI:10.1086/430514