标题： 选自红移5到10的类星体的颜色选择：克隆与发现 显示英文标题

标题： The Color Selection of Quasars from Redshifts 5 to 10: Cloning and Discovery

摘要： 我们基于发现的十个新的高红移类星体以及对低红移斯隆数字巡天（SDSS）类星体的克隆，进行了红移区间 5<z<10 的类星体颜色、亮度和数量的模拟。这十个类星体的红移范围从 z=4.7 到 z=5.3，i 波段亮度范围为 20.21 至 20.94。克隆样本中光谱特征的自然多样性使得与之前使用合成模板光谱相比，能够更现实地模拟类星体位置宽度。利用新的 UKIDSS 近红外滤光片组生成了 z>6 时期的颜色，并研究了生产力最高的红移区间，讨论了颜色选择和巡天深度的问题。基于 SDSS 样本，我们发现，通过将观测深度扩展到比 SDSS 光谱巡天极限 i=20.2 深 0.7 个 i 波段亮度，z>4.7 类星体的面密度增加了 3 倍——相应地，我们预测在 SDSS 主区域大约有 400 颗红移 z>4.7 且亮度小于 20.9 的微弱类星体。 显示英文摘要

摘要： We present simulations of quasar colors, magnitudes, and numbers at redshifts 5<z<10 based on our discovery of ten new high-redshift quasars and the cloning of lower redshift Sloan Digital Sky Survey (SDSS) quasars. The ten quasars have redshifts ranging from z=4.7 to z=5.3 and i-magnitudes of 20.21 to 20.94. The natural diversity of spectral features in the cloned sample allows more realistic simulation of the quasar locus width than previously possible with synthetic template spectra. Colors are generated for the z>6 epoch taking advantage of the new UKIDSS near-infrared filter set, and we examine the redshift intervals of maximum productivity, discussing color selection and survey depth issues. On the basis of the SDSS sample, we find that the surface density of z>4.7 quasars increases by a factor of 3X by extending 0.7 i-magnitudes deeper than the SDSS spectroscopic survey limit of i=20.2 -- correspondingly we predict a total of ~400 faint quasars in the SDSS main area that have redshift z>4.7 and magnitudes $<20.9.