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Quasar Research

类星体研究

基本信息

批准号：
9320715
负责人：
Christopher Impey
金额：
$ 37.57万
依托单位：
University of Arizona
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1994
资助国家：
美国
起止时间：
1994-05-15 至 1998-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9320715&HistoricalAwards=false
关键词：
Quasar Research

项目摘要

9320715 Impey This project involves a systematic study of the properties of quasars, using the recently completed Large Bright Quasar Survey (LBQS). The objective and quantifiable selection criteria for the LBQS will allow a calculation of the probability of detecting a quasar as a function of redshift and optical luminosity. There will be a determination of the sensitivity of derived quantities such as the luminosity function to the shape of the spectral energy distribution. The Principal Investigators will continue deep and shallow radio observations of the LBQS, in order to understand the bimodal distribution of radio luminosity. The environments and host galaxies of low redshift quasars (0.4 z 1) from the LBQS will be studied. The Principal Investigators will construct global energy distributions from radio to X-ray wavelengths for subsamples of the LBQS, in order to compare to the space density and evolution of quasars selected at other wavelengths. In addition to continuing to exploit the LBQS, the Principal Investigators will begin two new quasar surveys. The first will use red objective prism plates to look for rare populations of bright and high redshift (2 z 4) quasars. The second will use a multicolor digital sky survey to isolate large numbers of high and low redshift quasars, sufficient for studies of clustering and for a major improvement in our understanding of the luminosity function.

9320715 Impey 该项目涉及利用最近完成的大型明亮类星体巡天 (LBQS) 对类星体特性进行系统研究。 LBQS 的客观且可量化的选择标准将允许计算检测到类星体的概率作为红移和光度的函数。将确定导出量（例如光度函数）对光谱能量分布形状的敏感性。首席研究员将继续对LBQS进行深部和浅部射电观测，以了解射电光度的双峰分布。将研究来自 LBQS 的低红移类星体 (0.4 z 1) 的环境和宿主星系。首席研究员将为 LBQS 子样本构建从无线电到 X 射线波长的全球能量分布，以便与在其他波长选择的类星体的空间密度和演化进行比较。除了继续利用 LBQS 之外，首席研究员还将开始两项新的类星体调查。第一个将使用红色物镜棱镜板来寻找稀有的明亮且高红移 (2 z 4) 类星体群。第二个将使用多色数字天空调查来分离大量的高红移和低红移类星体，这足以用于聚类研究并大大提高我们对光度函数的理解。