Multi-tracer Studies of High Redshift Structure: Theoretical Development

高红移结构的多示踪剂研究：理论发展

• 批准号: 0098515
• 负责人: Jordi Miralda-Escude
• 金额: $ 16万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0098515&HistoricalAwards=false
• 关键词: Multi; tracer; Studies; Redshift; Structure

ABSTRACT AST 0098515Miralda-EscudeHigh resolution spectroscopic observations of quasars often show multiple emission-line and absorption-line features which are identified as the resonance line of Lyman Alpha (Lya ) which originates in clouds of hydrogen gas at different redshifts located between the observer and the quasar itself. These redshifted Lya lines can be used to map structure in the high-redshift universe (since the redshift gives position along the line of sight). This theoretical research program will show how correlations along multiple lines of sight in the observed Lya absorption lines and correlations between different tracer populations (such as narrow absorption lines, emission lines from diffuse hydrogen, and broad absorption lines) can tighten cosmological constraints and elucidate the physics of quasar and galaxy formation. The research will use hydrodynamic cosmological simulations, collisionless N-body simulations, and numerically calibrated analytic approximations to obtain predictions of current theoretical models, which can be tested against observational studies of multiple tracer populations in the same spatial volumes. In sum, the proposed research program will provide the theoretical development needed to motivate, design, analyze, and interpret multi-tracer studies of high-redshift structure.Funding for this project was provided by the NSF program for Extragalactic Astronomy & Cosmology (AST/EXC).***

类星体的高分辨率光谱观测经常显示出多重发射线和吸收线的特征，这些特征被认为是莱曼α（Lya）的共振线，它起源于位于观测者和类星体之间的不同红移的氢气云。这些红移的Lya线可以用来绘制高红移宇宙的结构（因为红移给出了沿着视线的位置）。这个理论研究计划将展示如何相关性沿着多条视线在观察到的Lya吸收线和不同的示踪剂种群之间的相关性（如窄吸收线，从扩散氢发射线，和广泛的吸收线）可以收紧宇宙学约束，并阐明类星体和星系形成的物理。该研究将使用流体动力学宇宙学模拟，无碰撞N体模拟和数值校准的解析近似来获得当前理论模型的预测，这些模型可以针对相同空间体积中多个示踪剂种群的观测研究进行测试。总而言之，拟议的研究计划将提供理论发展所需的激励，设计，分析和解释高红移结构的多示踪剂研究。该项目的资金由NSF河外天文宇宙学计划（AST/EXC）提供。