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.

使用类星体抽象的光谱和数值模拟，我们希望继续研究热热层间培养基（WHIM）的性质及其从高红移到低红移的发展。最近的研究表明，这种高温气相培养基（IGM）的这种高温气相包含本地宇宙中巴里昂总预算的30％，并且进一步可能代表高红移星系中产生的金属的储层。在这个项目中，我们希望继续对高分辨率光学和紫外光谱以及数值模拟中的合成光谱进行对HI和高离子分析系统的持续分析。使用观察性和模拟光谱数据，我们希望表征偶然受损系统的物理和统计特性，并确定有助于IGM中热气体发生的各种过程，例如银河风风和倒塌大型细丝。对偶然的模拟和观察数据的组合分析是解决宇宙中“缺失金属”和“失踪男爵”问题的有力方法。因此，我们的项目将在分层不断发展的宇宙的背景下更好地理解对层间介质的演变。