Collaborative Research: Taking Measure of the Universe with Galaxy and Cluster Surveys

合作研究：通过星系和星团巡天测量宇宙

• 批准号: 0708490
• 负责人: Anthony Gonzalez
• 金额: $ 33.89万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-15 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0708490&HistoricalAwards=false
• 关键词: Collaborative; Research; Taking; Measure; Universe

AST-0708490/AST-0708539Gonzalez/MohrThis project will execute a series of progressively more precise measurements of the expansion history of the Universe using galaxy cluster surveys and the clustering of galaxies. This team will complete and characterize two multi-band optical and infrared cluster surveys, the IRAC Shallow Cluster Survey (ISCS), using the Spitzer Space Telescope, and the Blanco Cosmology Survey (BCS), using the Blanco 4m telescope in Chile. The BCS will be used to measure the galaxy power spectrum with 3.5 million galaxies extending to redshifts greater than one. These new programs will be coordinated with current and forthcoming millimeter-wave surveys designed to find clusters using the Sunyaev-Zel'dovich effect. Future surveys intended to deliver constraints on the dark energy equation of state will invariably be limited by systematic rather than statistical uncertainties. The ISCS and BCS will clarify and quantify these systematic effects, while simultaneously obtaining new, near-term cosmological constraints. The work uses catalog and cluster simulations to estimate precisely the survey completeness and contamination, and the cluster mass estimate accuracy. It also focuses on fields with optical/infrared and mm-wave data, now or soon, and with some existing X-ray data. The multi-wavelength approach enables a cross-calibration of the leading cluster selection methods, the possibility of developing cleaner and more sensitive selection techniques, and direct tests of the selection models.This project will significantly impact larger experiments under way and to come. Because the BCS will constitute the largest contiguous deep optical survey in the southern hemisphere, the resulting public data set will be of great value for numerous other applications, such as galaxy evolution studies. This team has a record of working with K-12 teachers and students, and will expand that work in conjunction with the present research.

AST-0708490/AST-0708539 Gonzalez/Mohr该项目将使用星系团巡天和星系团对宇宙的膨胀历史进行一系列逐步更精确的测量。 该小组将完成两项多波段光学和红外星系团调查并确定其特征，即利用斯皮策空间望远镜进行的IRAC浅层星系团调查和利用智利的布兰科4米望远镜进行的布兰科宇宙学调查。 BCS将用于测量星系的功率谱，其中有350万个星系的红移大于1。 这些新计划将与目前和即将进行的毫米波调查相协调，这些调查旨在利用Sunyaev-Zel'dovich效应寻找星系团。 未来旨在对暗能量状态方程进行约束的调查将不可避免地受到系统而非统计不确定性的限制。 ISCS和BCS将澄清和量化这些系统效应，同时获得新的，近期的宇宙学约束。 这项工作使用目录和集群模拟，以准确地估计调查的完整性和污染，和集群质量估计精度。 它还侧重于现在或不久的光学/红外和毫米波数据以及一些现有X射线数据的领域。 多波长方法使领先的聚类选择方法的交叉校准成为可能，开发更清洁和更敏感的选择技术，并直接测试选择模型，该项目将对正在进行和即将进行的更大规模的实验产生重大影响。 由于BCS将构成南半球最大的连续深层光学勘测，因此由此产生的公开数据集将对星系演化研究等许多其他应用具有极大价值。 该团队有与K-12教师和学生合作的记录，并将结合目前的研究扩大这项工作。