Exploring the Far Distant Universe by Using Quasars as a Probe

以类星体为探测器探索遥远的宇宙

基本信息

批准号：
01540224
负责人：
IKEUCHI Satoru
金额：
$ 0.83万
依托单位：
National Astronomical Observatory
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540224/
关键词：
Absorption Line Systems Lyman alpha Forest Lyman Limit Systems Damped Lyman alpha Lines Cold Dark Matter Minihalos Galaxy Formation Diffuse UV Flux ライマン・フルファ-の森背景紫外光ライマン,リミット系若い銀河高励起金属線系

项目摘要

By utilizing the observational data such as III column density distribution and number density evolution laws of absorption line systems of quasars, I investigated the evolutionary features of young galaxies and diffuse UV flux at the red shifts of z = 0.3 - 4. In this research project, I concentrated to the following two categories : (1) CIV absorption line systems as a probe of galactic halos, and (2) three kinds of HI absorption systems as a probe of intergalactic clouds. Main conclusions are as follows.As for the first category, I studied the dynamical behavior of a gasecous halo, the increasing rate of heavy element abundances and the time variation of diffuse UV flux utilizing the observational data. As a result, I concluded that the gaecous halo is rapidly expanding and the heavy element abundances are increasing fast during the red shift z = 3 to 2. On the other hand, I found the diffuse UV flux to be constant in this epoch. These conclusions indicate that young galaxies were s … More o active in star formation and gaseous halos dynamically expand to 100 kpc due to the intense energy ejection from stars. At the same time, the emission of UV light from galaxies largely contributes to the diffuse UV background.As for the second category, I proposed a unified model for three kinds of III absorption systems, which are the Lyman alpha forest, Lyman limit systems and damped Lyman alpha line systems. The fundamental model is a minihalo which is an intergalactic cloud confined by the gravity of cold dark matter. This minihalo is ionized and heated up by the diffuse UV flux. Therefore, if the diffuse UV flux varies in time the evolution of minihalos is driven. In the envelope of a minihalo the gas is highly ionized and it is detected as the Lyman alpha forest. In the central part the UV flux is attenuated and the gas keeps in neutral. This region is observed as an Lyman limit system or damped Lyman alpha line system. Massive minihalos will collapse and evolve to galaxies, which are detected as the absorption systems of the first category.Accordingly, I concluded that the whole absorption line systems are reproduced under the cold dark matter dominated universe. Less

通过利用观测数据，例如类星体抽象线系统的III柱密度分布和数量密度进化定律，我研究了年轻星系的进化特征和z = 0.3-4的红色偏移时的扩散紫外线。探针的探针。主要结论如下。作为第一类，我研究了气体光环的动态行为，重元素丰度的增加速率以及利用观测数据的弥漫性UV通量的时间变化。结果，我得出的结论是，在红移z = 3至2期间，盖气光环正在迅速扩张，重元素丰度正在迅速增加。另一方面，我发现在这个时期内弥漫性UV通量是恒定的。这些结论表明，由于恒星的强烈能量喷射，年轻的星系是S…更活跃的恒星形成和气态光晕，动态扩展到100 kpc。同时，星系中的紫外线发射很大程度上有助于弥漫性紫外线背景。由于第二类，我为三种III III抽象系统提出了一个统一模型，即Lyman Alpha Forest，Lyman Limit Limit Systems和Darned Lyman Alpha Line Systems。基本模型是一种迷你蓝，是一种由冷暗物质重力限制的层间云。该minihalo被离子化并通过弥漫性紫外线加热。因此，如果弥漫性紫外线随着时间的推移范围范围，则驱动Minihalos的演变。在Minihalo的包膜中，气体被高度离子化，被检测为Lyman Alpha Forest。在中心部分，紫外线会衰减，气体保持中性状态。该区域被视为Lyman限制系统或该死的Lyman Alpha线系统。大型Minihalos将崩溃并发展为星系，这些星系被发现为第一类的抽象系统。根据我的结论，我得出的结论是，整个抽象线系统是在寒冷的暗物质主导的宇宙下重现的。较少的