标题： 探测Leo环和Leo I星系群的物理化学性质 显示英文标题

标题： Probing the physicochemical properties of the Leo Ring and the Leo I group

摘要： 我们展示了对Leo HI环和Leo I星系群物理与化学性质的吸收线研究，这些性质通过分布在600千秒差距×800千秒差距区域内的11个类星体视线来追踪。 利用HST/COS G130/G160存档观测数据作为约束条件，我们将逐云块、多相位、贝叶斯电离建模与星系属性信息相结合，以确定这些视线上的吸收气体的可能起源。 我们在600公里/秒至1400公里/秒的速度范围内寻找与Leo环/群动力学一致的吸收特征。我们发现，在五个视线方向上，吸收可能与Leo环相关。在另外三个视线方向上，吸收很可能与个别星系、星系间气体和/或大规模纤维状结构相关联。 在这五条视线上的吸收在金属线中的强度高于预期的单个星系贡献，表明有多重贡献来源以及该区域复杂的动力学特性。 我们还识别出在Leo环周围7度×6度范围内的三条视线，沿这些视线未发现任何吸收现象。 我们发现与Leo环相关的金属丰度普遍较高，介于太阳丰度和几倍太阳丰度之间。 推断出的高金属丰度与环作为主要星系合并潮汐碎片的起源一致。 显示英文摘要

摘要： We present an absorption line study of the physical and chemical properties of the Leo HI Ring and the Leo I Group as traced by 11 quasar sightlines spread over a 600 kpc X 800 kpc region. Using HST/COS G130/G160 archival observations as constraints, we couple cloud-by-cloud, multiphase, Bayesian ionization modeling with galaxy property information to determine the plausible origin of the absorbing gas along these sightlines. We search for absorption in the range 600 km/s - 1400 km/s consistent with the kinematics of the Leo Ring/Group. We find absorption plausibly associated with the Leo Ring towards five sightlines. Along three other sightlines, we find absorption likely to be associated with individual galaxies, intragroup gas, and/or large-scale filamentary structure. The absorption along these five sightlines is stronger in metal lines than expected from individual galaxies, indicative of multiple contributions, and of the complex kinematics of the region. We also identify three sightlines within a 7-degree X 6-degree field around the Leo Ring, along which we do not find any absorption. We find that the metallicities associated with the Leo Ring are generally high, with values between solar and several times solar. The inferred high metallicities are consistent with the origin of the ring as tidal debris from a major galaxy merger.