Sharpening our view of Cluster Cosmology

加深我们对星团宇宙学的看法

• 批准号: 2307546
• 负责人: Simon Dicker
• 金额: $ 49.91万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-08-01 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2307546&HistoricalAwards=false
• 关键词: Sharpening; our; view; Cluster; Cosmology

Clusters of galaxies are excellent tracers of the matter distribution in the Universe. Significant resources have been put into compiling cluster catalogs, because such surveys can be used to derive important cosmological parameters. One survey technique is to use the Sunyaev-Zel'dovich effect (SZE), which is when hot gas inside galaxy clusters distorts the spectrum of light from the Big Bang. However, radio emission from individual galaxies and cluster mergers can complicate interpretation of the SZE, resulting in sources of bias in cosmological parameters derived from cluster catalogs. High resolution images taken at radio frequencies can be used to quantify these biases. The investigators will use the MUSTANG2 camera on the Green Bank Telescope (GBT) to map clusters. Results from this program will help produce more accurate results from investments in past, current, and future galaxy cluster surveys. During this work, the investigators will maintain MUSTANG2, ensuring it remains available to the wider astronomical community. To help train a more diverse next generation of STEM workers, the team will work with the Simons Foundation and the Society of Black Physicists to host students working on MUSTANG2 projects. Outreach to middle school students is planned by participation in the Girls Exploring The Universe (GETU) summer camp run by the University of Virginia. In addition, the PI will continue public outreach activities in the Philadelphia area. The large scatter in cluster masses between the overlapping ACT (Atacama Cosmology Telescope) and eROSITA surveys will be investigated first. The team will (1) Finish a blind survey of clusters for compact sources at SZE frequencies (2) Use the results to correct the masses of the observed sample (3) Build a model for how likely sources are in different types of clusters that can be used to correct the mass-SZE relationship in a statistical sense and (4) Use deeper observations of selected clusters with remaining discrepant masses between surveys to find the cause. As part of the maintenance of MUSTANG2, the team will better integrate the pipeline into the observatory software infrastructure, further facilitating the use of MUSTANG2 data by the astronomical community.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

星系簇是宇宙中物质分布的出色示踪剂。已经将大量资源用于编译集群目录，因为这些调查可用于得出重要的宇宙学参数。一种调查技术是使用Sunyaev-Zel'Dovich效应（SZE），这是Galaxy簇内部的热气扭曲大爆炸的光谱。但是，来自单个星系和聚类合并的无线电发射会使SZE的解释变得复杂，从而导致源自聚类目录的宇宙学参数的偏见。在无线电频率下拍摄的高分辨率图像可用于量化这些偏见。调查人员将使用绿色银行望远镜（GBT）上的Mustang2摄像头绘制簇。该计划的结果将有助于从过去，当前和未来的Galaxy集群调查中产生更准确的结果。在这项工作中，调查人员将维持Mustang2，以确保其可用于更广泛的天文学界。为了帮助培训更多样化的下一代STEM工人，该团队将与Simons基金会和黑人物理学家协会合作，以接待从事Mustang2项目的学生。通过参加弗吉尼亚大学经营的宇宙（GETU）夏令营的女孩，计划与中学生的宣传。此外，PI将继续在费城地区进行公共宣传活动。重叠法（Atacama Cosmology望远镜）和Erosita调查之间的群集质量大量散布将首先进行研究。该团队（1）将对SZE频率的紧凑源源的群集进行盲目调查（2）使用结果来纠正观察到的样品的质量（3）为不同类型的群集中的源构建模型，这些模型可以被用来纠正统计意义上的大规模关系，（4）对选定的簇进行更深入的观察，并在调查之间剩余的差异质量来找到原因。作为维护Mustang2的一部分，团队将更好地将管道整合到天文台软件基础架构中，进一步促进天文学社区对Mustang2数据的使用。该奖项反映了NSF的法定任务，并被认为是通过使用评估的支持值得的。基金会的智力优点和更广泛的影响评论标准。