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Evolution of field dwarf galaxies with GEMS

机译:现场矮星系与宝石的演变

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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 amongstthe first to probe the evolution of dwarfs over such a large timescale. The comparison of structuralproperties, particularly size and scale length, indicates that the dwarfs in the redshift range z 0.01 to 0.15 (look-back times up to 1.8 Gyr) are more extended than local dwarfs. We arguethat this difference is due to the star formation activity becoming more centrally concentratedin late-type dwarfs over the last ~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 indicationof the fact that strong, centrally concentrated star formation is a feature of evolved dwarfs thatare entering their final stages of evolution.
机译:我们在最后1.5 Gyl中,根据宝石调查的一部分进行的HST ACS观察,展示了最后1.5 Gyr的越来的1.5 Gyrfs的演变。这项研究是第一个探讨矮人的演变在如此大的时间表。结构赋予的比较,特别是尺寸和比例长度,表示红移范围Z 0.01至0.15(高达1.8 Gyr)的矮人比本地矮人更加扩展。我们争论这种区别是由于星形形成活动变得更加集中在最后一个〜1.5 Gyr的矮人。我们讨论了这种进化的几个可能原因。我们还发现了Gems样本中缺少蓝色紧凑矮人,并将其解释为符号,即强大,中央集中的星形形成是进入其最终进化阶段的演变矮人的特征。

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