A Deep Multicolor Survey and the Evolution of Quasars

AST 95-29324 类星体是宇宙中已知的最遥远的天体，它可以将宇宙追溯到不到现在年龄10%的时候。然而，关于类星体演化的本质仍然存在许多问题。为了解决其中的一些问题，一个新的，类星体和活动星系核的深空观测已经进行了一个大的面阵CCD和KPNO 4-m望远镜。在六个过滤器中的光度校准图像，范围从034到0.86微米，覆盖0.83平方米。度下降到B = 23.8已经获得和减少。已经收集了超过21，000个恒星物体的目录，其中包括所有过滤器中的星等或上限和误差估计。还获得了选定物体的一些后续光谱。在该计划中，将完成数据分析，并公布数据，提供给天文学界。此外，还将进行进一步的光谱观测，以确定高红移类星体和红移2附近的类星体/活动星系核的性质和演化，其中光度函数的确定将对类星体演化模型提供重要的约束。 红外观测将用于研究高红移类星体的连续谱和发射线谱的可能演化。将研究致密窄发射线星系的性质和丰度，以确定它们的化学历史和演化状态。

AST 95-29324 Quasars, as the most distant known objects in the universe, probe the universe back to the time when it was less that 10% of its present age. However, there remain many questions about the nature of quasar evolution. To resolve some of these questions, a new, deep multicolor survey for quasars and AGNs has been undertaken with a large format CCD and the KPNO 4-m telescope. Photometrically calibrated images in six filters ranging from 034 to 0.86 um and covering 0.83 sq. deg down to B = 23.8 have been obtained and reduced. A catalog of over 21,000 stellar objects with magnitudes or upper limits and error estimates in all the filters has been assembled. Some follow-up spectroscopy has also been obtained for selected objects. In this program, the data analysis will be completed and the data published and made available to the astronomical community. In addition, further spectroscopic observations will be made to determine the properties and evolution of both high redshift quasars and quasars/AGNs near redshift 2, where a determination of the luminosity function will provide significant constraints on models of quasar evolution. Infrared observations will be used to investigate the possible evolution of the continuum and emission-line spectra of high-redshift quasars. The nature and abundances of the compact, narrow emission-line galaxies will be studied to determine their chemical history and evolutionary state.