论文标题

A2744和A370中的水母星系的位置和形态

Locations and Morphologies of Jellyfish Galaxies in A2744 and A370

论文作者

Bellhouse, C., Poggianti, B. M., Moretti, A., Vulcani, B., Werle, A., Gullieuszik, M., Radovich, M., Jaffe, Y. L., Fritz, J., Ignesti, A., Bacchini, C., Tomicic, N., Richard, J., Soucail, G.

论文摘要

我们介绍了一项研究,该研究使用Muse Integral-Field光谱和HST Imaging来自Frontier Fields计划的Muse Integral-Field光谱和HST Imaging计划,对大型的,中间红移(Z $ \ sim0.3-0.4 $)中的大量中间红移(z $ \ sim0.3-0.4 $)的轨道进行了研究。我们将剥离样品的位置和形态的不同度量与在同一簇中鉴定出的6个后星堡星系以及一般群集种群的样本。我们计算所有群集星系的相位位置并进行子结构分析,发现A370中的RAM压力剥离的星系与任何子结构无关,而是可能是孤立的。相比之下,A2744中的RAM压力剥离的星系严格位于高速子结构内,穿过密集的X射线发射气体的区域。我们得出的结论是,它们的RAM压力相互作用可能是群集两个组成部分之间合并的直接结果。最后,我们使用数值措施来量化视觉干扰水平,研究剥离和星堡星系的形态。我们探讨了这些星系与簇种群的任何形态偏差,尤其是通过存在电离气尾的较弱病例以进行RAM压力剥离,但在宽带数据中并未在视觉上受到强烈影响。我们发现,被剥离的样品星系通常与一般集群样品不同,星状星系是剥离星系和红色无源群集成员之间形态学的中介。

We present a study of the orbits, environments and morphologies of 13 ram-pressure stripped galaxies in the massive, intermediate redshift (z$\sim0.3-0.4$) galaxy clusters A2744 and A370, using MUSE integral-field spectroscopy and HST imaging from the Frontier Fields Program. We compare different measures of the locations and morphologies of the stripped sample with a sample of 6 poststarburst galaxies identified within the same clusters, as well as the general cluster population. We calculate the phase space locations of all cluster galaxies and carry out a substructure analysis, finding that the ram-pressure stripped galaxies in A370 are not associated with any substructures, but are likely isolated infalling galaxies. In contrast, the ram-pressure stripped galaxies in A2744 are strictly located within a high-velocity substructure, moving through a region of dense X-ray emitting gas. We conclude that their ram-pressure interactions are likely to be the direct result of the merger between two components of the cluster. Finally, we study the morphologies of the stripped and poststarburst galaxies, using numerical measures to quantify the level of visual disturbances. We explore any morphological deviations of these galaxies from the cluster population, particularly the weaker cases which have been confirmed via the presence of ionised gas tails to be undergoing ram-pressure stripping, but are not strongly visually disturbed in the broad-band data. We find that the stripped sample galaxies are generally divergent from the general cluster sample, with poststarburst galaxies being intermediary in morphology between stripped galaxies and red passive cluster members.

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