Multi-tracer Studies of High Redshift Structure: Theoretical Development

类星体的高分辨率光谱观测经常显示出多个发射线和吸收线特征，这些特征被确定为Lyman Alpha （Lya）的共振线，Lya起源于位于观测者和类星体本身之间不同红移的氢气云。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）。这一理论研究项目将展示沿观测到的Lya吸收谱线和不同示踪剂群（如窄吸收谱线、漫射氢的发射谱线和宽吸收谱线）之间的相关性如何收紧宇宙学约束，并阐明类星体和星系形成的物理学。该研究将使用流体动力学宇宙学模拟、无碰撞n体模拟和数值校准分析近似来获得当前理论模型的预测，这些模型可以通过对相同空间体积内多个示踪剂种群的观测研究进行测试。总之，提出的研究计划将为激发、设计、分析和解释高红移结构的多示踪剂研究提供所需的理论发展。本项目由美国国家科学基金会星系外天文学和宇宙学项目（AST/EXC）资助

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).***