Relating basic properties of bright early-type dwarf galaxies to their location in Abell 901/902

Relating basic properties of bright early-type dwarf galaxies to their location in Abell 901/902
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将明亮的早期型矮星系的基本特性与其在阿贝尔 901/902 中的位置联系起来

DOI:
10.1051/0004-6361/200912716
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发表时间:
2009-11
影响因子:
6.5
通讯作者:
Lane K
Lane K
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Peng C. Y.;Jahnke K.;van Kampen E.;Meisenheimer K.;Balogh M.;Heiderman A.;Wolf C.;Barden M.;Sanchez S. F.;Gray M. E.;Caldwell J. A. R.;Jogee S.;Zheng X. Z.;Böhm A.;Taylor A.;Heymans C.;Häussler B.;Barazza F. D.;Bell E. F.;Bacon D.;Lane K

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我们对Abell 901/902多星系团系统中明亮的早期矮星系群进行了研究。我们使用来自STAGES调查和COMBO-17的数据来研究矮星的颜色和结构特性与它们在星团中的位置之间的关系。矮样本的定义基于中心表面亮度,包括亮度范围在-16≥MB$\ga$ 19等的星系。通过拟合矮样本的色等关系,我们的样本被分为红色和蓝色亚样本。我们发现,在矮星样本的投影径向分布中存在一种颜色密度关系:在相同的光度下,颜色较红的矮星比颜色较蓝的矮星更靠近星团中心。此外,红矮星平均比蓝矮星更致密、更圆。这些发现与理论预期一致,假设明亮的早型矮星是转化后的晚型盘状星系的残余物,涉及诸如滑块压力剥离和星系骚扰等过程。这表明星系团中相当大一部分矮椭圆星系是与宿主星系团相互作用相关的转化过程的结果。
We present a study of the population of bright early-type dwarf galaxies in the multiple-cluster system Abell 901/902. We use data from the STAGES survey and COMBO-17 to investigate the relation between the color and structural properties of the dwarfs and their location in the cluster. The definition of the dwarf sample is based on the central surface brightness and includes galaxies in the luminosity range -16≥MB$\ga$ -19 mag. Using a fit to the color magnitude relation of the dwarfs, our sample is divided into a red and blue subsample. We find a color-density relation in the projected radial distribution of the dwarf sample: at the same luminosity dwarfs with redder colors are located closer to the cluster centers than their bluer counterparts. Furthermore, the redder dwarfs are on average more compact and rounder than the bluer dwarfs. These findings are consistent with theoretical expectations assuming that bright early-type dwarfs are the remnants of transformed late-type disk galaxies involving processes such as ram pressure stripping and galaxy harassment. This indicates that a considerable fraction of dwarf elliptical galaxies in clusters are the results of transformation processes related to interactions with their host cluster.
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