丰富环境中较小的恒星盘尺度长度
Smaller stellar disc scale lengths in rich environments
摘要：
我们调查的样本斯隆数字巡天数据发布7星系光度膨胀盘分解恒星盘尺度长度对环境的依赖性。我们比较盘尺度长度在固定的凸起质量的星系在一个孤立的领域的环境中的星系在X射线丰富和X射线穷人组。在低膨胀质量，恒星盘尺度的长度在X射线丰富的群体是较小的光盘相比，在X射线贫困的群体和孤立的领域环境。这种减少盘规模的长度在很大程度上是独立的晕质量，虽然显示了一些依赖于集团中心的距离。我们还发现，恒星盘尺度长度较小的X射线丰富的环境中的恒星形成星系的一个子集和不同形态类型的星系。我们注意到，低质量星系的盘尺度长度已知有很大的系统不确定性，但我们专注于具有相同测量偏差的样本之间的差异。我们的研究结果表明，恒星盘尺度长度依赖于X射线亮度，IGM密度的示踪剂，这表明流体动力学过程，如冲压压力剥离和/或饥饿的作用。
英文摘要：
We investigate the dependence of stellar disc scale lengths on environment for a sample of Sloan Digital Sky Survey Data Release 7 galaxies with published photometric bulge-disc decompositions. We compare disc scale lengths at fixed bulge mass for galaxies in an isolated field environment to galaxies in X-ray rich and X-ray poor groups. At low bulge mass, stellar disc scale lengths in X-ray rich groups are smaller compared to discs in both X-ray poor groups and in isolated field environments. This decrease in disc scale length is largely independent of halo mass, though shows some dependence on group-centric distance. We also find that stellar disc scale lengths are smaller in X-ray rich environments for a subset of star-forming galaxies and for galaxies of different morphological types. We note that disc scale lengths of low mass galaxies are known to have large systematic uncertainties, however we focus on differences between samples with the same measurement biases. Our results show that stellar disc scale lengths depend on X-ray brightness, a tracer of IGM density, suggesting a role for hydrodynamic processes such as ram-pressure stripping and/or starvation.
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