The evolution of the warm-hot intergalactic medium in a hierarchically evolving Universe

分层演化宇宙中暖热星际介质的演化

基本信息

批准号：
41939893
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：
2007
资助国家：
德国
起止时间：
2006-12-31 至 2011-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/41939893?language=en
关键词：
evolution warm hot intergalactic medium

项目摘要

Using quasar absorption-line spectroscopy and numerical simulations we want to continue our studies on the properties of the warm-hot intergalactic medium (WHIM) and its evolution from high to low redshifts. Recent studies indicate that this high-temperature gas phase of the intergalactic medium (IGM) contains about 30 percent of the total baryon budget in the local Universe and further may represent a reservoir of the metals produced in galaxies at high redshift. In this project we are studying the distribution of baryons and metals in the WHIM from z=3 to z=0 and analyze the relation between warm-hot intergalactic gas and galactic structures at different epochs of the Universe. We want to continue our on-going analysis of HI and high-ion absorption systems in high-resolution optical and ultraviolet spectra and in synthetic spectra from numerical simulations. Using both observational and simulated spectral data we want to characterize the physical and statistical properties of WHIM absorption systems and identify the various processes that contribute to the occurrence of hot gas in the IGM, such as galactic winds and collapsing large-scale filaments. The combined analysis of simulated and observational data of the WHIM is a powerful method to tackle the problem of the “missing metals” and “missing baryons” in the Universe. Our project thus will lead to a better understanding of the evolution of the intergalactic medium in the context of a hierarchically evolving Universe.

利用类星体吸收线光谱和数值模拟，我们希望继续研究暖热星系间介质（WHIM）的特性及其从高红移到低红移的演化。最近的研究表明，星系间的这种高温气相。介质（IGM）约占当地宇宙总重子预算的 30%，并且可能代表高红移星系中产生的金属库。在这个项目中，我们正在研究重子的分布。我们希望继续对 HI 和高离子吸收系统进行持续分析。在高分辨率光学和紫外光谱以及数值模拟的合成光谱中，我们希望使用观测和模拟光谱数据来表征 WHIM 吸收系统的物理和统计特性，并确定促成的各种过程。 IGM中热气体的出现，例如银河风和大尺度细丝的塌缩，WHIM的模拟和观测数据的结合分析是解决“缺失金属”和“缺失重子”问题的有力方法。因此，我们的项目将有助于更好地理解在分层演化的宇宙背景下星际介质的演化。