论文标题
最亮的星系星系和主机簇之间的对齐
The alignment between brightest cluster galaxies and host clusters
论文作者
论文摘要
最亮的簇星系（BCG）和宿主簇之间的对齐方式可以揭示出星系簇的形成和进化的奥秘。我们通过拟合集群内培养基（ICM）的形态来根据成员星系的预测分布和X射线测量光学的簇方向。在两个波长中确定的聚类方向通常是一致的。 BCG和主机簇之间的方向对齐被确认，并且比以前的工作更重要。我们发现，BCG与在X射线中测量的群集方向更加一致，而不是光学数据。 BCG较明亮的簇通常显示出更强的对准。我们认为，对齐的检测到的红移演变可能是由观察性偏差而不是固有进化引起的。该对齐与BCG的椭圆度以及宿主簇的丰富性，椭圆度和动态状态无关。 ICMS的BCG和形态之间的强烈一致性可能是中央大型星系和宿主簇之间共同进化的结果。
The alignment between brightest cluster galaxies (BCGs) and host clusters can reveal the mystery of formation and evolution for galaxy clusters. We measure cluster orientations in optical based on the projected distribution of member galaxies and in X-ray by fitting the morphology of intra-cluster medium (ICM). Cluster orientations determined in the two wavelengths are generally consistent. The orientation alignment between BCGs and host clusters is confirmed and more significant than previous works. We find that BCGs are more aligned with cluster orientations measured in X-ray than those from optical data. Clusters with a brighter BCG generally show a stronger alignment. We argue that the detected redshift evolution of the alignment is probably caused by observational bias rather than intrinsic evolution. The alignment is not related to the ellipticity of BCGs, and the richness, ellipticity and dynamical state of host clusters. The strong alignment between BCGs and morphology of ICMs may be the consequence of the co-evolution between the central massive galaxy and host clusters.
