Near-Infrared Surveys for High-Redshift Quassars

高红移类星体的近红外测量唐纳德·P·施奈德在过去的十年里，美国国家科学基金会资助了一系列调查，使用的是Palomar 5米望远镜上的大画幅CCD相机。这些调查研究了红移约为4的类星体数量。红移最高的类星体很有趣；它们对这些天体的形成机制施加了最强的约束，并揭示了星际介质在更早的时候的性质。在这项研究中，施奈德博士将这些研究扩展到最多六个红移。调查包括以下数据集：(1)两次Palomar CCD调查；一次四滤波调查和一次无缝隙调查。(2)斯隆数字天空调查；(3)伦琴卫星和钱德拉先进X射线设施的两次深部X射线调查中的光学识别*

AST-9900703Near infrared surveys for high redshift quasarsDonald P. SchneiderOver the last decade the NSF has funded a series of surveys, carried out using a large format CCD camera on the Palomar 5-m telescope. These surveys have investigated quasar populations at a redshift of about four. The highest redshift quasars are interesting; they place the strongest constraints on formation mechanisms of these objects and reveal the nature of the intergalactic medium at ever earlier times. In this study, Dr. Schneider is extending these studies out to redshifts of up to six. The investigations consist of the following datasets: (1) two Palomar CCD surveys; a four filter survey and a slitless survey. (2)the Sloan Digital Sky Survey; and (3) optical identifications in two deep x-ray surveys form Roentgen Satellite and the Chandra advanced x-ray facility.****