The DEEP Survey of the Distant Universe

这是我与加州大学圣克鲁斯分校的Sandra Faber及其同事的合作研究项目（AST0071198）。这项研究的目标是对红移为z0.7的星系进行大规模、系统的调查。这次调查（深河外进化探测器- Deep）的目的是测量遥远星系的性质及其在太空中的分布。它由两部分组成：1小时巡天（1HS），用Z0.7绘制约50,000个星系的空间位置；3小时巡天（3HS），在1HS目标的子样本上，利用HST成像数据测量约5,000个星系的红移、线宽和结构，并比1HS深入到亮度函数中约1等。Faber， Davis和合作者将使用这些数据来确定Z~1星系的基本属性，例如：数量密度，星系相关函数，以及作为星系类型函数的群集统计。他们还将使用3HS的数据来确定暗晕的质量和在红移时潜在的暗物质分布，以及“偏倚函数”。这个合作项目支持在夏威夷的凯克望远镜上进行120个晚上的观测项目，该项目将收集大约6万个暗淡星系的光谱数据，目的是阐明暗淡、遥远星系的特性，以及它们的空间分布统计。深空探测将提供前所未有的、详细的宇宙学意义上的宇宙回顾时间。这项调查将产生关于高红移星系及其环境的信息，其质量可与目前附近星系的数据相媲美。这个数据集将在网络上提供给更广泛的社区，将能够对替代宇宙模型的进化预测进行有力的测试。通过计算星系的丰度和测量的红移，人们可以精确地确定宇宙膨胀的加速度，这是对基础物理学的一种测试。深空巡天将充分利用为凯克望远镜准备的新型光谱仪，DEIMOS，它具有大视场、高光谱分辨率和宽光谱覆盖范围。深地探测的科学计划无法在世界上任何其他仪器或望远镜上有效地复制。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）和MPS多学科活动办公室提供资金

AST-0071048DavisThis is a collaborative research project with Sandra Faber and colleagues at University of California, Santa Cruz (AST0071198). The goal of this research is to conduct a large, systematic survey of galaxies with redshifts Z 0.7. This survey (Deep Extragalactic Evolutionary Probe - DEEP) is designed to measure both the properties of distant galaxies and their distribution in space. It consists of two parts: a 1-hour survey (1HS), to map the spatial locations of ~50,000 galaxies with Z0.7, and a 3-hour survey (3HS), on a sub sample of the 1HS targets, to measure redshifts, line widths, and structure for ~5,000 galaxies, using HST imaging data, and going ~ 1 magnitude deeper into the luminosity function than the 1HS. Faber, Davis, and collaborators will use the data to determine fundamental properties of galaxies at Z~1 such as: number densities, the galaxy correlation function, and clustering statistics as a function of galaxy type. They will also use the data from the 3HS to determine the dark halo masses and underlying dark matter distribution at this redshift, as well as the "biasing function." This collaborative project supports a 120 night observing program on the Keck telescope in Hawaii that will garner spectroscopic data on approximately 60,000 faint galaxies, with the goal of elucidating the properties of faint, distant galaxies, as well as the statistics of their spatialdistribution. The DEEP survey will provide an unprecedented, detailed look at the universe at cosmologically significant lookback times. The survey will generate information on high redshift galaxies and their environment that is comparable in quality to data currently available for nearby galaxies. This dataset, which will be made Web accessible to the broader community, willenable powerful tests of the evolutionary predictions of alternative cosmological models. By counting the abundance of galaxies versus measured redshift, one can precisely determine the acceleration rate of the expansion of the Universe, a test of fundamental physics. The DEEP survey will take full advantage of a new spectrograph being prepared for the Keck telescope, DEIMOS, which has a large field of view, high spectral resolution, and wide spectralcoverage. The scientific program of the DEEP survey cannot be replicated efficiently on any other instrument or telescope worldwide. Funding for this project was provided by the NSF program for Extragalactic Astronomy & Cosmology (AST/EXC) and the MPS Office of Multidisciplinary Activities.***