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原初和主序星系在不同尺度下的恒星形成

發(fā)布時間:2022-07-16 19:42
  恒星形成過程是星系成長和演化歷程中的核心過程。本論文主要研究星系中的恒星形成相關的三個主要問題:一是其產(chǎn)物,如金屬元素和恒星質(zhì)量,是如何與恒星活動相關的;二是其原料,如分子氣體的性質(zhì),是如何被星系活動影響,又是如何影響其恒星活動的;三是星系中心的活動星系核如何影響其附近的恒星形成。宇宙早期形成的高紅移星系,金屬豐度低,但是觀測和研究高紅移星系困難。低紅移宇宙中的貧金屬星系很多特性和高紅移星系相似,可以認為是宇宙早期高紅移星系的對應體,可以用來研究宇宙早期星系的恒星形成活動、恒星質(zhì)量累積與金屬元素增豐過程之間的關系。利用LAMOST光譜巡天數(shù)據(jù)和eBOSS光譜巡天數(shù)據(jù),論文的第2章,我們開展了近鄰宇宙和中等紅移貧金屬星系搜尋和研究。利用[OⅢ]λ4363譜線,我們構(gòu)建了 48個z~0和35個z~0.8的貧金屬星系樣本,新發(fā)現(xiàn)了十多個極端貧金屬星系。利用上述樣本,我們研究了星系質(zhì)量、金屬豐度和恒星形成率關系,得到如下結(jié)論:1)近鄰宇宙中的貧金屬星系質(zhì)量-金屬豐度關系(MZR),和前人研究工作中的結(jié)果一致;2)中等紅移貧金屬星系的MZR明顯低于低紅移貧金屬星系和中等紅移正常星系的MZR,表明... 

【文章頁數(shù)】:139 頁

【學位級別】:博士

【文章目錄】:
摘要
ABSTRACT
第1章 簡介
    1.1 恒星形成活動與其產(chǎn)物的關系
        1.1.1 恒星質(zhì)量-恒星形成率關系
        1.1.2 星系整體的恒星質(zhì)量、金屬豐度與恒星形成率等參數(shù)之間的關系
        1.1.3 星系局部的質(zhì)量面密度、金屬豐度與恒星形成率等參數(shù)之間的關系
    1.2 恒星形成活動與氣體的關系
    1.3 活動星系核活動對恒星形成的作用
    1.4 此篇論文的大綱
第2章 近鄰及中等紅移宇宙中的貧金屬星系
    2.1 背景
        2.1.1 貧金屬星系
        2.1.2 貧金屬星系的前期搜尋
    2.2 LAMOST巡天中的貧金屬星系
        2.2.1 LAMOST望遠鏡及巡天數(shù)據(jù)介紹
        2.2.2 LAMOST光譜處理及發(fā)射線的測量
        2.2.3 貧金屬星系樣本的篩選
        2.2.4 星系物理參數(shù)的測定
        2.2.5 星系質(zhì)量、恒星形成率及金屬豐度的關系
        2.2.6 與SDSS光譜的對比
    2.3 eBOSS巡天中的貧金屬星系
        2.3.1 eBOSS巡天及數(shù)據(jù)介紹
        2.3.2 eBOSS光譜處理及發(fā)射線測量
        2.3.3 貧金屬星系的篩選
        2.3.4 星系物理參數(shù)的測定
        2.3.5 星系質(zhì)量、恒星形成率及金屬豐度的關系
    2.4 討論
        2.4.1 金屬豐度及星系質(zhì)量測定中不同假設的不確定度
        2.4.2 貧金屬星系的MZR、FMR關系與其他工作的對比
        2.4.3 貧金屬星系的討論
    2.5 小結(jié)
第3章 恒星形成星系內(nèi)部的化學演化
    3.1 背景
    3.2 基于IFU觀測的恒星形成星系的篩選及參數(shù)的測定
        3.2.1 MaNGA IFU巡天項目介紹
        3.2.2 光譜處理
        3.2.3 恒星形成星系的篩選
        3.2.4 星系物理特性的測定
    3.3 星系內(nèi)局部空間的金屬元素的分布
        3.3.1 質(zhì)量面密度-金屬豐度關系
        3.3.2 恒星質(zhì)量、質(zhì)量面密度與金屬豐度的相關強度
        3.3.3 星系質(zhì)量、質(zhì)量面密度與金屬豐度之間的關系
    3.4 討論
        3.4.1 與之前工作的對比
        3.4.2 M_* -∑_*-Z關系的殘差
        3.4.3 不同金屬豐度計算方法的影響
        3.4.4 M_* -∑_*-Z關系的含義
    3.5 小結(jié)
第4章 NGC 1365星系核心區(qū)域的恒星形成與氣體分布
    4.1 背景
    4.2 望遠鏡的觀測及數(shù)據(jù)處理
        4.2.1 ALMA望遠鏡及觀測
        4.2.2 VLT/MUSE望遠鏡及觀測數(shù)據(jù)
    4.3 物理參數(shù)的分析
        4.3.1 分子氣體質(zhì)量的測量
        4.3.2 SFR和恒星質(zhì)量的測量
        4.3.3 空間BPT分布與AGN貢獻度
    4.4 結(jié)果
        4.4.1 核區(qū)的恒星形成關系
        4.4.2 SFE的空間分布
        4.4.3 分子氣體動力學
    4.5 討論
        4.5.1 恒星形成
        4.5.2 氣體的非圓周運動
    4.6 小結(jié)
第5章 總結(jié)及展望
    5.1 已有工作總結(jié)
    5.2 未來工作展望
        5.2.1 貧金屬星系的質(zhì)量-質(zhì)量面密度-金屬豐度關系
        5.2.2 宇宙早期的金屬增豐
        5.2.3 活動星系核附近的恒星形成
參考文獻
致謝
在讀期間發(fā)表的學術論文與取得的研究成果


【參考文獻】:
期刊論文
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