Quasar Research

[9320715]这个项目涉及对类星体性质的系统研究，使用最近完成的大型明亮类星体调查（LBQS）。LBQS的客观和可量化的选择标准将允许以红移和光学光度的函数计算探测类星体的概率。将确定衍生量（如光度函数）对光谱能量分布形状的灵敏度。首席研究人员将继续对LBQS进行深、浅射电观测，以了解射电亮度的双峰分布。对LBQS低红移类星体（0.4 z 1）的环境和宿主星系进行了研究。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，以便与在其他波长下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，首席研究人员还将开始两次新的类星体调查。第一个将使用红色物镜棱镜板来寻找罕见的明亮和高红移（2z4）类星体。第二个项目将使用多色数字巡天来隔离大量的高红移和低红移类星体，这足以用于研究群集，并大大提高我们对光度函数的理解。

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.