Near-Infrared Surveys for High-Redshift Quassars

AST-9900703高红移类星体的近红外巡天Donald P. Schneider在过去的十年中，NSF资助了一系列的巡天，使用Palomar 5米望远镜上的大幅面CCD相机进行。 这些调查研究了红移约为4的类星体种群。 最高红移的类星体是有趣的;它们对这些物体的形成机制有最强的约束，并揭示了星系际介质在更早时期的性质。 在这项研究中，施耐德博士将这些研究扩展到红移6。 调查由以下数据集组成：（1）两个Palomar CCD调查;一个四过滤器调查和一个无狭缝调查。 （2）斯隆数字巡天;（3）伦琴卫星和钱德拉高级x射线设施进行的两次深度x射线巡天中的光学识别。

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.****