AI 中文总结
本研究基于VESTIGE巡天观测，对室女座星系NGC 4254周围的60个年轻星团展开分析，探究了星系外围气体剥离对星团恒星形成及演化的影响。
AI 中文摘要
星系外围因球状星团、卫星星系的聚集以及与环境的相互作用而展现出独特特征。星系团中的星系会因相互碰撞以及星系团内气体而受到动力学影响，后者会施加拖曳力以去除星系外围的气体。这些被剥离的气体云能够形成恒星，并引发关于天体物理过程的基础问题，例如星系际气体云的存活、恒星形成过程、孤立星团的演化等。本研究以室女座旋涡星系NGC 4254周围的星团为研究对象，该星系在VESTIGE巡天中被观测到，在GALEX/FUV波段共识别出60个年轻星团，它们具有不同的质量、年龄以及与成熟星系盘的距离。其中仅有一半的星团同时发射H-α，这是因为星团仍被气体包裹时才会发射H-α，直到 ram pressure（ ram压力）剥离气体，导致恒星形成猝灭和LyC（莱曼连续谱）逃逸。
英文摘要
The outskirts of galaxies show their beauty by an assembly of Globular Clusters and satellite galaxies, but also by interactions with their environment. Galaxies in clusters experience dynamical effects by mutual encounters and by the intra-cluster gas. This latter exerts a drag to remove gas from the outskirts. These stripped clouds are capable to form stars and open fundamental questions on astrophysical processes, as e.g. the survival of intergalactic clouds, the star-formation process, the evolution of isolated star clusters, etc. Our studies target at star clusters around the Virgo cluster spiral galaxy NGC 4254, observed within the VESTIGE survey. 60 young clusters are identified in the GALEX/FUV with different masses, ages, and separations from the mature galactic disk. Only half of them are also emitting H-alpha as long as the clusters are still encompassed by gas until ram pressure strips it off leading to star-formation quenching and LyC escape.
Comments4 pages, 2 figures, Proceedings of the IAU Symposium No. 403, The Hidden Beauty of Galactic Outskirts
