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原初和主序星系在不同尺度下的恒星形成

发布时间:2022-07-16 19:42
  恒星形成过程是星系成长和演化历程中的核心过程。本论文主要研究星系中的恒星形成相关的三个主要问题:一是其产物,如金属元素和恒星质量,是如何与恒星活动相关的;二是其原料,如分子气体的性质,是如何被星系活动影响,又是如何影响其恒星活动的;三是星系中心的活动星系核如何影响其附近的恒星形成。宇宙早期形成的高红移星系,金属丰度低,但是观测和研究高红移星系困难。低红移宇宙中的贫金属星系很多特性和高红移星系相似,可以认为是宇宙早期高红移星系的对应体,可以用来研究宇宙早期星系的恒星形成活动、恒星质量累积与金属元素增丰过程之间的关系。利用LAMOST光谱巡天数据和eBOSS光谱巡天数据,论文的第2章,我们开展了近邻宇宙和中等红移贫金属星系搜寻和研究。利用[OⅢ]λ4363谱线,我们构建了 48个z~0和35个z~0.8的贫金属星系样本,新发现了十多个极端贫金属星系。利用上述样本,我们研究了星系质量、金属丰度和恒星形成率关系,得到如下结论:1)近邻宇宙中的贫金属星系质量-金属丰度关系(MZR),和前人研究工作中的结果一致;2)中等红移贫金属星系的MZR明显低于低红移贫金属星系和中等红移正常星系的MZR,表明... 

【文章页数】:139 页

【学位级别】:博士

【文章目录】:
摘要
ABSTRACT
第1章 简介
    1.1 恒星形成活动与其产物的关系
        1.1.1 恒星质量-恒星形成率关系
        1.1.2 星系整体的恒星质量、金属丰度与恒星形成率等参数之间的关系
        1.1.3 星系局部的质量面密度、金属丰度与恒星形成率等参数之间的关系
    1.2 恒星形成活动与气体的关系
    1.3 活动星系核活动对恒星形成的作用
    1.4 此篇论文的大纲
第2章 近邻及中等红移宇宙中的贫金属星系
    2.1 背景
        2.1.1 贫金属星系
        2.1.2 贫金属星系的前期搜寻
    2.2 LAMOST巡天中的贫金属星系
        2.2.1 LAMOST望远镜及巡天数据介绍
        2.2.2 LAMOST光谱处理及发射线的测量
        2.2.3 贫金属星系样本的筛选
        2.2.4 星系物理参数的测定
        2.2.5 星系质量、恒星形成率及金属丰度的关系
        2.2.6 与SDSS光谱的对比
    2.3 eBOSS巡天中的贫金属星系
        2.3.1 eBOSS巡天及数据介绍
        2.3.2 eBOSS光谱处理及发射线测量
        2.3.3 贫金属星系的筛选
        2.3.4 星系物理参数的测定
        2.3.5 星系质量、恒星形成率及金属丰度的关系
    2.4 讨论
        2.4.1 金属丰度及星系质量测定中不同假设的不确定度
        2.4.2 贫金属星系的MZR、FMR关系与其他工作的对比
        2.4.3 贫金属星系的讨论
    2.5 小结
第3章 恒星形成星系内部的化学演化
    3.1 背景
    3.2 基于IFU观测的恒星形成星系的筛选及参数的测定
        3.2.1 MaNGA IFU巡天项目介绍
        3.2.2 光谱处理
        3.2.3 恒星形成星系的筛选
        3.2.4 星系物理特性的测定
    3.3 星系内局部空间的金属元素的分布
        3.3.1 质量面密度-金属丰度关系
        3.3.2 恒星质量、质量面密度与金属丰度的相关强度
        3.3.3 星系质量、质量面密度与金属丰度之间的关系
    3.4 讨论
        3.4.1 与之前工作的对比
        3.4.2 M_* -∑_*-Z关系的残差
        3.4.3 不同金属丰度计算方法的影响
        3.4.4 M_* -∑_*-Z关系的含义
    3.5 小结
第4章 NGC 1365星系核心区域的恒星形成与气体分布
    4.1 背景
    4.2 望远镜的观测及数据处理
        4.2.1 ALMA望远镜及观测
        4.2.2 VLT/MUSE望远镜及观测数据
    4.3 物理参数的分析
        4.3.1 分子气体质量的测量
        4.3.2 SFR和恒星质量的测量
        4.3.3 空间BPT分布与AGN贡献度
    4.4 结果
        4.4.1 核区的恒星形成关系
        4.4.2 SFE的空间分布
        4.4.3 分子气体动力学
    4.5 讨论
        4.5.1 恒星形成
        4.5.2 气体的非圆周运动
    4.6 小结
第5章 总结及展望
    5.1 已有工作总结
    5.2 未来工作展望
        5.2.1 贫金属星系的质量-质量面密度-金属丰度关系
        5.2.2 宇宙早期的金属增丰
        5.2.3 活动星系核附近的恒星形成
参考文献
致谢
在读期间发表的学术论文与取得的研究成果


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期刊论文
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