Galaxy Clusters at z > 1

z 处的星系团

• 批准号: 0909198
• 负责人: Gillian Wilson
• 金额: $ 33.18万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0909198&HistoricalAwards=false
• 关键词: Galaxy; Clusters; & gt

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Dr Wilson will study ten clusters of galaxies at redshift 0.87 z 1.34, which are seen as they were when the cosmos had expanded to only about half its present size. The clusters are chosen from a survey that combined 3.6-micron images from a 50-square degree survey with the Spitzer Space telescope with images from the ground at 900nm, to pick out the red sequence of old elliptical galaxies. These are some of the most distant galaxy clusters for which distances have been confirmed spectroscopically. Dr Wilson and her team will seek additional spectroscopy for about 50 galaxies in each cluster, calibrating the relation between cluster mass and richness for comparison with cosmological simulations of early galaxy formation. Additional optical images will provide a total of 10 color-bands in the optical and near-infrared, which will be used to estimate the rate of star formation (both dust-obscured and otherwise) and the stellar masses present in each galaxy. The PI also seeks near-infrared spectroscopy for more distant candidate clusters in the 'redshift desert' between 1.5 z 2; these would be the first confirmed clusters in this redshift range. This sample of clusters is especially valuable for comparison with models, because it is selected in a quantifiable way, but one that is different from that for X-ray-selected clusters.A graduate student will be trained by participating in the research. Dr Wilson will integrate results of this research into her undergraduate teaching, and will continue her work in teacher-education and public-outreach programs. Data products will be distributed on the web.

该奖项是根据2009年的《美国回收与再投资法》（公法111-5）资助的。DrWilson将在Redshift 0.87 Z 1.34上研究十个星系簇，这被视为当Cosmos扩展到其目前大小的一半。 群集是从一项调查中选择的，该调查将50平方学的调查与Spitzer Space望远镜的3.6微米图像结合在一起，并在900nm时与地面的图像相结合，以挑选出旧椭圆星系的红色序列。 这些是一些最遥远的星系簇，可以通过光谱进行确认。 威尔逊博士和她的团队将在每个集群中寻求大约50个星系的更多光谱，从而校准簇质量和丰富度之间的关系，以与早期星系形成的宇宙学模拟进行比较。 其他光学图像将在光学和近红外提供10个颜色波段，这些颜色将用于估计恒星形成的速率（无论是尘埃刺激还是其他）以及每个星系中存在的恒星质量。 PI还寻求近红外光谱法，以在1.5 Z 2之间的“红移沙漠”中更遥远的候选群集；这些将是此红移范围内的第一个确认群集。 该群集的样本对于与模型进行比较特别有价值，因为它是以可量化的方式选择的，但与X射线选择的集群不同。研究生将通过参与研究来培训。 威尔逊博士将将这项研究的结果整合到她的本科教学中，并将继续在教师教育和公共造成计划方面的工作。 数据产品将分配在网络上。