论文标题
Latis：Ly $α$层析成像imacs调查
LATIS: The Ly$α$ Tomography IMACS Survey
论文作者
论文摘要
我们介绍了Latis，这是Magellan的一项光谱调查，旨在通过观察星系和QSO的光谱中的Ly $α$森林，在三个维度上绘制Z = 2.2-2.8的Z = 2.2-2.8层间介质（IGM）。在1.7度$ {}^2 $的面积中，我们将观察到$ \ gtrsim l^*$星系的大约一半，z = 2.2-3.2通常为12小时，提供了一个密集的视线网络，刺穿了IgM网络，平均横向分离为2.5 $ h^{ - 1} $ com com compoving mpc（1 Yollemly Mpc（1 y yrallying Mpc）。在这些尺度上，预计IGM的不透明度与暗物质密度密切相关，因此Latis将以$ \ sim $ \ sim $ MPC分辨率在迄今为止最大的卷中以$ z \ sim 2.5 $ Universe的形式绘制密度字段。最终，Latis将产生大约3800个Z = 2.2-3.2星系的光谱，这些星系在$ 4 \ times 10^6 H^{ - 3} $ MPC $ {}^3 $中探测Igm，足以包含来自原始量的代表性结构样本到大型大型voids。在调查区域的三分之一中，观察结果已经完成。在本文中，我们描述了调查设计和执行。我们以可比较的分辨率呈现了最大的IGM断层图图。我们表明，恢复的物质过度与基于逼真的模拟调查基于宇宙学期望，它们与银河系过重相对应，并且我们可以使用其他示踪剂来恢复结构。拉蒂斯在加拿大 - 弗朗西 - 哈瓦伊望远镜传统调查领域进行，包括宇宙。将LATIS断层扫描图与在这些领域中收集的丰富数据集结合在一起，将使对环境依赖性星系进化和宇宙中午的Galaxy-Igm连接进行新的研究。
We introduce LATIS, the Ly$α$ Tomography IMACS Survey, a spectroscopic survey at Magellan designed to map the z=2.2-2.8 intergalactic medium (IGM) in three dimensions by observing the Ly$α$ forest in the spectra of galaxies and QSOs. Within an area of 1.7 deg${}^2$, we will observe approximately half of $\gtrsim L^*$ galaxies at z=2.2-3.2 for typically 12 hours, providing a dense network of sightlines piercing the IGM with an average transverse separation of 2.5 $h^{-1}$ comoving Mpc (1 physical Mpc). At these scales, the opacity of the IGM is expected to be closely related to the dark matter density, and LATIS will therefore map the density field in the $z \sim 2.5$ universe at $\sim$Mpc resolution over the largest volume to date. Ultimately LATIS will produce approximately 3800 spectra of z=2.2-3.2 galaxies that probe the IGM within a volume of $4 \times 10^6 h^{-3}$ Mpc${}^3$, large enough to contain a representative sample of structures from protoclusters to large voids. Observations are already complete over one-third of the survey area. In this paper, we describe the survey design and execution. We present the largest IGM tomographic maps at comparable resolution yet made. We show that the recovered matter overdensities are broadly consistent with cosmological expectations based on realistic mock surveys, that they correspond to galaxy overdensities, and that we can recover structures identified using other tracers. LATIS is conducted in Canada-France-Hawaii Telescope Legacy Survey fields, including COSMOS. Coupling the LATIS tomographic maps with the rich data sets collected in these fields will enable novel studies of environment-dependent galaxy evolution and the galaxy-IGM connection at cosmic noon.
