Quasar Research

9320715 Impey这个项目利用最近完成的大型亮类星体调查，对类星体的性质进行了系统的研究。LBQS的客观和可量化的选择标准将允许计算探测到类星体的概率作为红移和光学光度的函数。将确定诸如光度函数之类的导出量对光谱能量分布的形状的灵敏度。首席调查人员将继续对LBQS进行深浅两方面的射电观测，以了解射电光度的双峰分布。我们将研究来自LBQS的低红移类星体(0.4z1)的环境和宿主星系。首席研究人员将为LBQS的子样本构建从射电到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外，首席调查员还将开始两次新的类星体调查。第一个将使用红色物镜平板来寻找稀有的明亮和高红移(2z4)类星体。第二个将使用多色数字巡天来分离大量的高红移和低红移类星体，这足以用于星系团的研究和对光度函数的重大改进。

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.