论文标题
Subaru/Suprime-CAM在昏迷集群中的低表面亮度星系的扩展目录
An expanded catalogue of low surface brightness galaxies in the Coma cluster using Subaru/Suprime-Cam
论文作者
论文摘要
我们在$ \ sim $ 4度$^2 $的区域内提供了从深层Subaru/Suprime-Cam V和R-band Imaging数据中获得的昏迷群集中低表面亮度（LSB）星系的目录。我们增加了Yagi等人中介绍的LSB星系的数量。 （2016年）以$ \ sim $ 3的价格报告，并报告了29个新的超湿星系（UDGS）的发现。我们在昏迷集群中编译了最大的超湿星系样品。虽然大多数UDG都沿着颜色 - 磁性图的红色序列关系，但$ \ sim $ 5％的$ 5％在外面（蓝或红）昏迷星系的红色序列区域。我们的分析表明，在UDGS和其他LSB星系之间的基本光度参数中没有特殊的区别。我们研究了簇色的分布，并在预计半径为$ \ sim $ 0.6 MPC的情况下找到一个显着的过渡。在该集群核心区域内，LSB星系平均比共同空间更高的表面亮度星系红色，强调了脆弱的LSB星系在集群密集的中央区域中发挥作用的物理过程。过渡半径的位置与最近对大型星系簇的宇宙学模拟产生的期望一致，在该群体中，预测古老的中心将主导LSB星系人群。
We present a catalogue of low surface brightness (LSB) galaxies in the Coma cluster obtained from deep Subaru/Suprime-Cam V and R-band imaging data within a region of $\sim$4 deg$^2$. We increase the number of LSB galaxies presented in Yagi et al. (2016) by a factor of $\sim$3 and report the discovery of 29 new ultra-diffuse galaxies (UDGs). We compile the largest sample of ultra-diffuse galaxies with colours and structural parameters in the Coma cluster. While most UDGs lie along the red-sequence relation of the colour-magnitude diagram, $\sim$5per cent are outside (bluer or redder) the red-sequence region of Coma cluster galaxies. Our analyses show that there is no special distinction in the basic photometric parameters between UDGs and other LSB galaxies. We investigate the clustercentric colour distribution and find a remarkable transition at a projected radius of $\sim$0.6 Mpc. Within this cluster core region, LSB galaxies are, on average, redder than co-spatial higher surface brightness galaxies, highlighting how vulnerable LSB galaxies are to the physical processes at play in the dense central region of the cluster. The position of the transition radius agrees with expectations from recent cosmological simulation of massive galaxy clusters within which ancient infalls are predicted to dominate the LSB galaxy population.
