Tracing large-scale structure at high redshift with Lyman-α emitters: the effect of peculiar velocities
Tracing large-scale structure at high redshift with Lyman-α emitters: the effect of peculiar velocities
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用莱曼-α发射器追踪高红移的大尺度结构：特殊速度的影响
DOI：
10.1051/0004-6361:20042570
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
A. Univ.
中科院分区：
文献类型：
--
作者：
P. Monaco;P. Møller;J. Fynbo;M. Weidinger;C. Ledoux;T. Univ.;Eső;Garching;A. Obs.;Copenhagen;A. Univ.;Santiago;D. Univ.;A. Univ.
本文研究了z > 2星系的特殊速度对红移空间分布的影响，特别是对Lyα发射体的影响。我们生成了暗物质晕的目录，并确定了具有相同共同运动空间密度（M（Lyα发射体）<$3 × 10 11 M）的晕的发射体。我们将晕的速度场分解为流场、梯度场和随机场，并计算和分析了它们随尺度的变化。流速是由非常大尺度的波动决定的，受样本方差的影响很大，但对观测结果的解释影响不大。梯度速度是最重要的，因为它们扭曲了红移空间中的结构，改变了片和丝的厚度和方向。随机速度通常低于或等于红移上典型的观测不确定性。我们讨论了这些效应对于解释Lyα发射体（或类似的天体物理学高红移天体）追踪的大尺度结构数据的重要性，重点是灯丝视角的诱导误差。我们比较了我们对Lyα发射体速度模式的预测和观测结果，发现Lyα发射体的红移聚集，例如在高红移射电星系的领域中报道的，不允许推断观察到的领域是否是采样早期星系过密度。
We investigate the effect of peculiar velocities on the redshift space distribution of z > 2 galaxies, and we focus in particular on Lyα emitters. We generate catalogues of dark matter (DM) halos and identify emitters with halos of the same co-moving space density (M(Lyα emitters) ≈ 3 × 10 11 M� ). We decompose the peculiar velocity field of halos into streaming, gradient and random components, and compute and analyse these as a function of scale. Streaming velocities are determined by fluctuations on very large scales, strongly affected by sample variance, but have a modest impact on the interpretation of observations. Gradient velocities are the most important as they distort structures in redshift space, changing the thickness and orientation of sheets and filaments. Random velocities are typically below or of the same order as the typical observational uncertainty on the redshift. We discuss the importance of these effects for the interpretation of data on the large-scale structure as traced by Lyα emitters (or similar kinds of astrophysical high-redshift objects), focusing on the induced errors in the viewing angles of filaments. We compare our predictions of velocity patterns for Lyα emitters to observations and find that redshift clumping of Lyα emitters, as reported for instance in the fields of high-redshift radio galaxies, does not allow to infer whether an observed field is sampling an early galaxy overdensity.
DOI：
10.1046/j.1365-8711.2001.04029.x
发表时间：
2001-02-21
影响因子：
4.8
作者：
Jenkins, A;Frenk, CS;Yoshida, N
通讯作者：
Yoshida, N