发表机构
University of Bristol; Finnish Centre for Astronomy with ESO, University of Turku; Department of Physics and Astronomy, Botswana International University of Science and Technology; Astrophysics Research Institute, Liverpool John Moores University; Macquarie University（布里斯托大学; 芬兰埃索天文学中心，图尔库大学; 博茨瓦纳国际科学与技术大学物理与天文系; 利物浦约翰摩尔斯大学天体物理研究所; 麦考瑞大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
基于GAMA巡天和客观孤立性度量，研究最孤立星系的物理特征，发现孤立星系多为蓝色盘状恒星形成星系，但性质有重叠；控制质量后，孤立与成群恒星形成星系无差异，表明其演化由内部过程主导。
AI 中文摘要
虽然星系通常存在于星系团和星系群中，特别是小群，或其他结构如墙状结构和纤维状结构中，但有些星系显得相对“孤立”，即缺乏邻近星系。在这里，我们利用GAMA巡天，并采用一种客观的孤立性度量，来探索最孤立的星系。然后我们确定这些星系是否具有特殊的物理特征。我们发现，正如预期的那样，虽然成群的星系分为蓝色、盘状、恒星形成的星系和红色、椭球状、宁静的星系，孤立的星系则优先属于前者。然而，在性质上存在广泛的重叠，一些孤立的星系也具有后者的特征。仅考虑恒星形成的星系，当控制质量时，我们发现成群的星系和孤立的星系在恒星形成和恒星种群方面没有差异。鉴于孤立样本缺乏显著的相互作用，这意味着在所有环境中（至少在富星系团之外）现今恒星形成星系的演化一直且仍然由内部过程主导。
英文摘要
While galaxies generally live in clusters and groups, particularly small groups, or other structures such as walls or filaments, some galaxies appear relatively `isolated', i.e. lacking in close neighbours. Here we use the GAMA survey, and an objective measure of isolation, to explore the most isolated galaxies. We then determine whether these have particular physical characteristics. We find that, as expected, while grouped galaxies split between blue, disk-like and star forming and red, spheroidal and quiescent, isolated galaxies are preferentially the former. However, there is a broad overlap in properties, with some isolated galaxies sharing the latter characteristics. Considering only the star-forming galaxies, when controlled by mass we find no differences between the grouped and isolated galaxies in terms of their star formation and stellar populations. Given the lack of significant interactions for the isolated sample, this implies that the evolution of present-day star-forming galaxies in all environments (at least outside rich clusters) has been, and remains, dominated by internal processes.
CommentsMNRAS accepted for publication
