论文标题
希克森紧凑型组中星系类型和HI气的演变
Evolution of Galaxy Types and HI Gas in Hickson Compact Groups
论文作者
论文摘要
紧凑型组具有高星系密度和较低的速度分散体，他们的群体成员在其一生中经历了许多频繁的相互作用。它们提供了一个独特的环境来研究星系的发展。我们在组中检查了星系类型和HI含量，以研究紧凑型组的星系进化。我们将小组交叉时间用作星系组的年龄指标。我们的样本源自希克森紧凑型组目录。我们从Hyper-LeDA数据库和IR分类中获得了基于Zucker等人的宽场红外调查Explorer（Wise）通量的IR分类数据的组形态数据。 （2016）。通过交叉匹配最新发布的苜蓿100％HI源目录并补充了文献中的数据，我们获得了40个带有HI数据的星系组。我们证实，AI＆Zhu（2018）在SDSS组中发现的HI质量分数与组交叉时间之间的弱相关性也存在于紧凑的组中。我们还发现，组的螺旋星系分数与组的交叉时间相关，但是积极的星形星系分数与组交叉时间无关。这些结果似乎与以下假设相吻合：从周围的大规模结构中依次获得邻居已经影响了紧凑型组的形态过渡和恒星形成效率。
Compact groups have high galaxy densities and low velocity dispersions, and their group members have experienced numerous and frequent interactions during their lifetimes. They provide a unique environment to study the evolution of galaxies. We examined the galaxies types and HI contents in groups to make a study on the galaxy evolution in compact groups. We used the group crossing time as an age indicator for galaxy groups. Our sample is derived from the Hickson Compact Group catalog. We obtained group morphology data from the Hyper-Leda database and the IR classification based on Wide-Field Infrared Survey Explorer (WISE) fluxes from Zucker et al. (2016). By cross-matching the latest released ALFALFA 100% HI source catalog and supplemented by data found in literature, we obtained 40 galaxy groups with HI data available. We confirmed that the weak correlation between HI mass fraction and group crossing time found by Ai & Zhu (2018) in SDSS groups also exists in compact groups. We also found that the group spiral galaxy fraction is correlated with the group crossing time, but the actively star-forming galaxy fraction is not correlated with the group crossing time. These results seem to fit with the hypothesis that the sequential acquisition of neighbors from surrounding larger-scale structures has affected the morphology transition and star formation efficiency in compact groups.
