论文标题
昏迷集群中的RAM压力剥离候选者：增强恒星形成的证据
Ram pressure stripping candidates in the Coma Cluster: Evidence for enhanced star formation
论文作者
论文摘要
昏迷群是最近的大型（$ M \ gtrsim 10^{15} \，\ mathrm {m_ \ odot} $）星系群，使其成为探索簇环境对星系星形成的影响的绝佳实验室。在这里，我们提供了41个星系的样本，这些星系具有与RAM压力剥离一致的形态受到干扰的样本。这些星系是使用昏迷群的加拿大 - 法兰西 - 弗朗西 - 夏威夷望远镜的高质量的多频段成像在视觉上识别的。这些“剥离候选者”是普通定量形态学措施的明显异常值，例如浓度 - 空气对称性和gini- $ m_ {20} $，证实了他们的干扰性质。基于观察到的不对称性的方向以及投影相位空间中的星系位置，这些候选者与星系中的星系在coma群集上后不久被剥离。最后，剥离候选物显示出增强的恒星形成速率，这既相对于“正常”的恒星昏迷星系和野外孤立的星系。在淬灭之前，在剥离阶段，RAM压力可能会推动恒星形成的增强。总体而言，在昏迷集群的所有地区，RAM压力剥离似乎无处不在。
The Coma cluster is the nearest massive ($M \gtrsim 10^{15}\,\mathrm{M_\odot}$) galaxy cluster, making it an excellent laboratory to probe the influence of the cluster environment on galaxy star formation. Here, we present a sample of 41 galaxies with disturbed morphologies consistent with ram pressure stripping. These galaxies are identified visually using high-quality, multi-band imaging from the Canada-France-Hawaii telescope covering ~9 $\mathrm{deg^2}$ of the Coma cluster. These "stripping candidates" are clear outliers in common quantitative morphological measures, such as concentration-asymmetry and Gini-$M_{20}$, confirming their disturbed nature. Based on the orientations of observed asymmetries, as well as the galaxy positions in projected phase-space, these candidates are consistent with galaxies being stripped shortly after infall onto the Coma cluster. Finally, the stripping candidates show enhanced star formation rates, both relative to "normal" star-forming Coma galaxies and isolated galaxies in the field. Ram pressure is likely driving an enhancement in star formation during the stripping phase, prior to quenching. On the whole, ram pressure stripping appears to be ubiquitous across all regions of the Coma cluster.
