重建极端区域星系轨道（ROGER）III：大质量X射线星系团投影相空间的星系演化模式
Reconstructing Orbits of Galaxies in Extreme Regions (ROGER) III: galaxy evolution patterns in projected phase space around massive X-ray clusters
摘要：
我们使用de los Rios等人的ROGER代码将X射线星系团周围的星系根据它们在投影相空间图中的位置分为五类：星系团星系、后溅星系、新近坠落星系、坠落星系和闯入者。为了了解星系团环境对星系演化的影响，我们比较了五个类别：恒星质量，特定恒星形成率，大小和形态。根据Coenda等人的指导方针，对红星系和蓝星系进行了单独的分析。对于红色星系，团星系与其他类别不同，具有抑制的特定恒星形成率，较小的尺寸，更有可能被归类为椭圆星系。其他类别之间的差异较小，但后溅星系的特定恒星形成率明显低于早期或最近的坠落星系。对于蓝色星系，我们发现证据表明，最近的坠落星系比坠落星系和闯入者小，而后两者的大小相当。我们的研究结果提供的证据表明，在一次通过后，星系团环境可以减少星系的恒星形成，改变其形态，也可以减少蓝色星系的大小。我们发现的证据表明，淬火发生速度比形态转换从螺旋到椭圆的所有类。当星系进入星系团时，淬灭现象会明显增强，但重要的形态转变需要星系在更长的时间尺度上经历星系团物理机制的作用。
英文摘要：
We use the ROGER code by de los Rios et al. to classify galaxies around a sample of X-ray clusters into five classes according to their positions in the projected phase space diagram: cluster galaxies, backsplash galaxies, recent infallers, infalling galaxies, and interlopers. To understand the effects of the cluster environment to the evolution of galaxies, we compare across the five classes: stellar mass, specific star formation rate, size, and morphology. Following the guidelines of Coenda et al., a separate analysis is carried out for red and blue galaxies. For red galaxies, cluster galaxies differ from the other classes, having a suppressed specific star formation rate, smaller sizes, and are more likely to be classified as ellipticals. Differences are smaller between the other classes, however backsplash galaxies have significantly lower specific star formation rates than early or recent infalling galaxies. For blue galaxies, we find evidence that recent infallers are smaller than infalling galaxies and interlopers, while the latter two are comparable in size. Our results provide evidence that, after a single passage, the cluster environment can diminish a galaxy's star formation, modify its morphology, and can also reduce in size blue galaxies. We find evidence that quenching occurs faster than morphological transformation from spirals to ellipticals for all classes. While quenching is evidently enhanced as soon as galaxies get into clusters, significant morphological transformations require galaxies to experience the action of the physical mechanisms of the cluster for longer timescales.
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