Exploring Intergalactic Dust on the Largest Scales

最大规模地探索星际尘埃

• 批准号: 1009514
• 负责人: Ryan Scranton
• 金额: $ 53.92万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1009514&HistoricalAwards=false
• 关键词: Exploring; Intergalactic; Dust; Largest; Scales

This project extends recent work by the PI and collaborator on the nature and spatial extent of dust around galaxies at cosmological distances. The team, by correlating the colors of quasars with the density of foreground galaxies, has established that these galaxies (on average) have dust halos extending out to on the order of 10 megaparsecs. In this project they will greatly increase the depth and wavelength coverage of the analysis, applying their existing techniques and making use of the newest archival data releases from the Sloan Digital Sky Survey, Deep Lens Survey, and the deep sample of the Canada-France-Hawaii Telescope Legacy Survey (optical), the GALEX satellite (ultraviolet), and the FIRST survey (radio). They will study the dependence of the dust extent and absorption properties on galaxy luminosity, morphological type, and redshift; constrain the physical nature of the dust and possible scenarios for the enrichment of galaxy halos; and assess the impact that extended dust will have on future measurements of the expansion and acceleration of the universe. A software package developed by the PI for analyzing multiwavelength data from disparate sources (STOMP) will be made available to the community. The PI, as one of the developers of Google Sky, will explore the development of an "astronomical wiki," through which research results can be shared with the community and the public. A graduate student will be trained through participation in the research.

这个项目扩展了PI和合作者最近在宇宙距离处星系周围尘埃的性质和空间范围方面的工作。通过将类星体的颜色与前景星系的密度相关联，该团队已经确定，这些星系(平均而言)有大约10兆秒的尘埃晕。在这个项目中，他们将应用他们现有的技术并利用斯隆数字天空调查、深度透镜调查和加拿大-法国-夏威夷望远镜遗产调查(光学)、GALEX卫星(紫外线)和第一次调查(无线电)的深层样本发布的最新档案数据，大大增加分析的深度和波长覆盖范围。他们将研究尘埃范围和吸收性质对星系光度、形态类型和红移的依赖；约束尘埃的物理性质和星系晕浓缩的可能情景；并评估扩展的尘埃将对未来宇宙膨胀和加速的测量产生的影响。由PI开发的用于分析来自不同来源的多波长数据的软件包(STOMP)将向社区提供。PI作为Google Sky的开发者之一，将探索开发一个“天文维基”，通过这个维基可以与社区和公众分享研究成果。一名研究生将通过参与研究进行培训。