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.

对星系外区域中高离子气体的分布和物理性质的透彻理解对于表征星系中星体气体与播层间培养基之间的物质交换至关重要。在这个项目中，我们将使用来自所谓的绝大部分大型模拟（OWLS）项目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色星系的海洋隔离环境中高离子气体的性质。我们将生成高离子，例如OVI，NE VIII等高离子的合成吸收光谱，并沿着视线穿过星系的大规模环境，并研究海外气体成分中的吸收特征，填充因子和物理条件。然后，将合成光谱的统计特性与FUSE和HST的低降射OVI吸收器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的高离子气体信封的物理性质及其与多相，多尺度的星际介质和宇宙网络的联系。