Evolution of Field Dwarf Galaxies with GEMS
Abstract
We present a study of the evolution of late-type field dwarfs over the last ~ 1.9 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 ~ 0.01 to 0.15 (look-back times up to 1.9 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 ~ 1.9 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 indicative of the fact that strong, centrally concentrated star formation is a feature of evolved dwarfs that are entering their final stages of evolution.
Cite
@article{arxiv.astro-ph/0505514,
title = {Evolution of Field Dwarf Galaxies with GEMS},
author = {Fabio D. Barazza and Shardha Jogee},
journal= {arXiv preprint arXiv:astro-ph/0505514},
year = {2009}
}
Comments
4 pages, to appear in the proceedings of IAUC198: Near-Field Cosmology with Dwarf Elliptical Galaxies, Helmut Jerjen and Bruno Binggeli, eds