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Evolution of field dwarf galaxies with GEMS

Published online by Cambridge University Press:  08 November 2005

Fabio D. Barazza  and
Shardha Jogee
Fabio D. Barazza
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: [email protected] Present address: Department of Astronomy, University of Texas at Austin, RLM 15.308, Austin, TX 78712, USA
Shardha Jogee
Affiliation:
Department of Astronomy, University of Texas at Austin, RLM 15.308, Austin, TX 78712, USA
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Abstract

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We present a study of the evolution of late-type field dwarfs over the last 1.5 Gyr, based on HST ACS observations carried out as part of the GEMS survey. This study is amongst the first to probe the evolution of dwarfs over such a large timescale. The comparison of structural properties, particularly size and scale length, indicates that the dwarfs in the redshift range $z \sim$ 0.01 to 0.15 (look-back times up to 1.8 Gyr) are more extended than local dwarfs. We argue that this difference is due to the star formation activity becoming more centrally concentrated in late-type dwarfs over the last ${\sim} 1.5$ Gyr. We discuss several possible causes for this evolution. We also find a lack of blue compact dwarfs in the GEMS sample and interpret this as indication of the fact that strong, centrally concentrated star formation is a feature of evolved dwarfs that are entering their final stages of evolution.

Keywords

galaxies: evolutiongalaxies: dwarfgalaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C198: Near-Field Cosmology with Dwarf Elliptical Galaxies , March 2005 , pp. 177 - 180
Copyright
© 2005 International Astronomical Union