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.

该奖项由《2009 年美国复苏与再投资法案》（公法 111-5）资助。威尔逊博士将研究红移 0.87 z 1.34 处的十个星系团，这些星系团在宇宙膨胀到只有一半左右时的样子它现在的大小。 这些星团是从一项巡天中选出的，该巡天将使用斯皮策太空望远镜进行的 50 平方度巡天的 3.6 微米图像与来自地面的 900 纳米的图像相结合，以选出旧椭圆星系的红色序列。 这些是一些最遥远的星系团，其距离已通过光谱得到证实。 威尔逊博士和她的团队将为每个星团中约 50 个星系寻找额外的光谱，校准星团质量和丰富度之间的关系，以便与早期星系形成的宇宙学模拟进行比较。 额外的光学图像将提供总共 10 个光学和近红外色带，这些色带将用于估计恒星形成率（尘埃遮挡和其他情况）以及每个星系中存在的恒星质量。 PI 还寻找近红外光谱来寻找 1.5 z 2 之间“红移沙漠”中更遥远的候选星团；这些将是该红移范围内第一个被确认的星团。 该簇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 射线选择的簇的方式不同。研究生将通过参与研究来接受培训。 威尔逊博士将把这项研究成果融入到她的本科教学中，并将继续她在教师教育和公共宣传项目中的工作。 数据产品将在网络上分发。