Probing the Cosmic Evolution with the Most Distant Quasars

用最遥远的类星体探索宇宙演化

• 批准号: 0307384
• 负责人: Xiaohui Fan
• 金额: $ 33.19万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0307384&HistoricalAwards=false
• 关键词: Probing; Cosmic; Evolution; Most; Distant

AST-0307384FanThis project will carry out three aggressive observational campaigns aimed at obtaining large, complete samples of quasars at the highest redshifts, based on imaging data from the Sloan Digital Sky Survey (SDSS). A wide field survey of luminous candidates in the North Galactic Cap will find 15 to 20 quasars above redshift 5.7, a survey using the deep equatorial stripe data will provide a sample of about a thousand faint quasars above redshift 3, and a multi-wavelength follow-up will produce an unparalleled high-quality dataset for a selected sub-sample.The data will be used to study the evolution, luminosity function, and clustering of quasars, to map the accretion history of the earliest quasars and constrain their evolution, and to consider the relation between super-massive black holes and galaxy evolution. The investigators will also measure the quasar environment, including metallicity and spectral signature. Other research will follow the evolution of the intergalactic medium and the end of reionization, using absorption features in the quasar spectra and the Gunn-Peterson troughs along different lines of sight.The research will involve graduate and undergraduate students, and all of the data will be made available to the community in a timely fashion, including not just the quasar catalog but also the quasar spectra.

AST-0307384 Fan该项目将开展三项积极的观测活动，旨在根据斯隆数字巡天（SDSS）的成像数据获得大量完整的最高红移类星体样本。 对北银河帽发光候选者的广域调查将发现15至20个红移5.7以上的类星体，使用深赤道条纹数据的调查将提供约1000个红移3以上的暗类星体的样本，多波长后续将为选定的子样本产生无与伦比的高质量数据集。这些数据将用于研究红移5.7以上的类星体的演化、亮度函数、和成团，绘制最早期类星体的吸积历史并约束它们的演化，以及考虑超大质量黑洞与星系演化的关系。 研究人员还将测量类星体的环境，包括金属丰度和光谱特征。 其他研究将利用类星体光谱和冈恩-彼得森槽沿着不同视线的吸收特征，跟踪星系际介质的演化和再电离的结束。研究将涉及研究生和本科生，所有数据都将及时提供给社区，不仅包括类星体目录，还包括类星体光谱。