The coevolution of massive compact ellipticals and their black holes at high redshift

高红移条件下大质量致密椭圆体及其黑洞的共同演化

• 批准号: 125644655
• 负责人: Dr. Thorsten Naab
• 金额: --
• 依托单位: Max-Planck-Institut für Astrophysik (MPA)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/125644655?language=en
• 关键词: coevolution; massive; compact; ellipticals; their

This project proposes a detailed investigation of the origin of massive compact evolved elliptical galaxies and their black holes at high redshift. These galaxies have very low star formation rates, are three to five times smaller than present day ellipticals and have one to two orders of magnitude higher mass densities than their low redshift counterparts. We will, for the first time, use sub kiloparsec resolution cosmological ”zoom” simulations of a statistical sample of massive galaxies in a cosmological volume to address two fundamental physical questions: 1) How do black holes in massive high redshift spheroids grow and which process is responsible for the termination of star formation in these systems? Is it mainly feedback from a central super-massive black hole, winds from a massive starburst or simply very efficient gas consumption or a combination? 2) Why are the high redshift ellipticals so compact and what is the main driver for the rapid size evolution? There is strong theoretical evidence that minor (gas poor) mergers are more important for the strong evolution in size and density than major mergers, in particular for massive galaxies at high redshift. This growth mechanism will be explored in detail. At the end of the funding period we expect to be able to answer both questions.

该项目提出对大质量致密演化椭圆星系及其高红移黑洞的起源进行详细调查，这些星系的恒星形成率非常低，比当今的椭圆星系小三到五倍，数量级为一到两个数量级。我们将首次对宇宙体积中的大质量星系的统计样本使用亚千秒差距分辨率的宇宙学“缩放”模拟。解决两个基本的物理问题：1）大质量高红移球体中的黑洞如何生长以及哪个过程导致这些系统中恒星形成的终止主要是来自中心超大质量黑洞的反馈，来自恒星的风？大量星暴或只是非常气体消耗或组合？ 2）为什么高红移椭圆如此紧凑，快速尺寸演化的主要驱动因素是什么？这规模和密度的演化比重大合并更强烈，特别是对于高红移的大质量星系，我们预计在资助期结束时能够回答这两个问题。

项目成果

THE COSMOLOGICAL SIZE AND VELOCITY DISPERSION EVOLUTION OF MASSIVE EARLY-TYPE GALAXIES

大质量早型星系的宇宙学尺寸和速度色散演化

• DOI: 10.1088/0004-637x/744/1/63
• 发表时间: 2011-06-27
• 期刊: The Astrophysical Journal
• 作者: L. Oser;T. Naab;J. Ostriker;P. Johansson
• 通讯作者: P. Johansson