On the nature of highly ionized gas in the circumgalactic environment of galaxies

星系环星系环境中高电离气体的性质

• 批准号: 203331888
• 负责人: Professor Dr. Philipp Richter
• 金额: --
• 依托单位: Institut für Physik und Astronomie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/203331888?language=en
• 关键词: nature; highly; ionized; gas; circumgalactic

A thorough understanding of the distribution and physical nature of highly-ionized gas in the outer regions of galaxies is of crucial importance to characterize the matter exchange between the interstellar gas in galaxies and the intergalactic medium. In this project, we will use high-resolution smoothed particle hydrodynamic (SPH) cosmological simulations from the so-called OverWhelmingly Large Simulations (OWLS) project to study the properties of highly-ionized gas in the circumgalactic environment of low-redshift galaxies. We will generate synthetic absorption spectra of high ions such as OVI, Ne VIII, and others along sightlines passing through the large-scale environment of galaxies and study the absorption characteristics, filling factors, and physical conditions in the circumgalactic gas component. The statistical properties of the synthetic spectra then will be compared to quasar absorption-line data of low-redshift OVI absorbers from FUSE and HST. Our project is aiming at a better understanding of the physical nature of the highly-ionized gaseous envelopes of galaxies and their connection to the multi-phase, multi-scale interstellar medium and the cosmic web.

深入了解星系外部区域高电离气体的分布和物理性质对于表征星系中星际气体与星系间介质之间的物质交换至关重要。在这个项目中，我们将使用所谓的超大规模模拟（OWLS）项目中的高分辨率平滑粒子流体动力学（SPH）宇宙学模拟来研究低红移星系环星系环境中高电离气体的特性。我们将沿着穿过星系大尺度环境的视线生成OVI、Ne VIII等高离子的合成吸收光谱，研究环星系气体成分的吸收特性、填充因子和物理条件。然后，合成光谱的统计特性将与来自 FUSE 和 HST 的低红移 OVI 吸收体的类星体吸收线数据进行比较。我们的项目旨在更好地了解星系高度电离气体包层的物理性质及其与多相、多尺度星际介质和宇宙网的联系。