Finding high-redshift voids using Lyman α forest tomography
Finding high-redshift voids using Lyman α forest tomography
复制标题
使用莱曼α森林断层扫描寻找高红移空洞
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
K. Lee
中科院分区：
文献类型：
--
作者：
C. Stark;A. Font;M. White;K. Lee
作者：Stark，CW; Font-Ribera，A;白色，M; Lee，KG|摘要：© 2015作者。由牛津大学出版社代表皇家天文学会出版。本文提出了一种利用Lyα森林通量层析图寻找宇宙空洞的新方法。我们在z=2.5的大N体模拟中识别了半径为2-12 h-1 Mpc的宇宙学空洞，并在密度和Lyα森林通量上表征了高红移空洞的信号。空洞的性质类似于在较低的红移下发现的，但是它们更小，并且具有更陡峭的径向密度分布。类似于已经发现的低红移空洞，径向速度分布几乎没有散射，并同意非常好的线性理论预测。我们在理想的Lyα通量场上运行相同的空洞探测器，并在不同的空间采样下进行层析重建。我们比较层析地图空目录的密度空目录，并找到良好的协议，即使与中等大小的空隙（RG 6 h-1 Mpc）。使用我们简单的空洞发现方法，正在进行的COSMOS莱曼阿尔法测绘和层析成像观测（CLAMATO）调查的配置覆盖1 deg 2将提供约100个高红移空洞的样本。我们还提供了更大面积的调查空洞发现预测，并讨论如何使用这些空洞的样本可以用来测试修改后的重力模型，研究高红移空洞星系，并作出阿尔科克Paczynski测量。为了帮助在这一领域的未来工作，我们提供公众访问我们的模拟产品，目录，和样品层析通量图。
Author(s): Stark, CW; Font-Ribera, A; White, M; Lee, KG | Abstract: © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. We present a new method of finding cosmic voids using tomographic maps of Lyα forest flux. We identify cosmological voids with radii of 2-12 h-1 Mpc in a large N-body simulation at z=2.5, and characterize the signal of the high-redshift voids in density and Lyα forest flux. The void properties are similar to what has been found at lower redshifts, but they are smaller and have steeper radial density profiles. Similarly towhat has been found for low-redshift voids, the radial velocity profiles have little scatter and agree very well with the linear theory prediction. We run the same void finder on an ideal Lyα flux field and tomographic reconstructions at various spatial samplings. We compare the tomographic map void catalogues to the density void catalogue and find good agreement even with modest-sized voids (r g 6 h-1 Mpc). Using our simple void-finding method, the configuration of the ongoing COSMOS Lyman Alpha Mapping And Tomography Observations (CLAMATO) survey covering 1 deg2 would provide a sample of about 100 high-redshift voids. We also provide void-finding forecasts for larger area surveys, and discuss how these void samples can be used to test modified gravity models, study high-redshift void galaxies, and to make an Alcock-Paczynski measurement. To aid future work in this area, we provide public access to our simulation products, catalogues, and sample tomographic flux maps.
DOI：
10.1016/j.ascom.2014.10.002
发表时间：
2014-06
期刊：
Astron. Comput.
影响因子：
--
作者：
P. Sutter;G. Lavaux;N. Hamaus;A. Pisani;Benjamin Dan Wandelt;Michael S. Warren;F. Villaescusa-Navarro-F.-Villaescusa-Navarr
通讯作者：
P. Sutter;G. Lavaux;N. Hamaus;A. Pisani;Benjamin Dan Wandelt;Michael S. Warren;F. Villaescusa-Navarro-F.-Villaescusa-Navarr