标题： 高红移双类星体 II：z ~ 3-4范围内的次兆秒聚类 显示英文标题

标题： Binary Quasars at High Redshift II: Sub-Mpc Clustering at z ~ 3-4

摘要： 我们给出了 z > 2.9 的高红移类星体双点相关函数的小尺度（0.1 ≲ r ≲ 1 Mpc/h）测量结果，这是由 Hennawi 等人（2009）收集的一个亮度极限为 i < 21 的 15 对类星体样本。小尺度聚类的幅度从 z ≈ 3 增加到 z ≈ 4。小尺度聚类的幅度与幂律外推（斜率 γ = 2）相当，该外推基于来自斯隆数字巡天（SDSS）的 i < 20.2 类星体样本的大尺度相关函数。通过将类星体与暗物质晕关联的简单模型，我们用晕占据模型来拟合观测到的小尺度聚类。再现大尺度聚类幅度需要晕中心星系中的黑洞活动比例接近于 1，但小尺度聚类水平则更倾向于卫星星系中黑洞的活动比例在 z ≳ 3 时满足 0.1 ≲ f_s ≲ 0.5。 显示英文摘要

摘要： We present measurements of the small-scale (0.1<~ r <~ 1 Mpc/h) quasar two-point correlation function at z>2.9, for a flux-limited (i<21) sample of 15 binary quasars compiled by Hennawi et al. (2009). The amplitude of the small-scale clustering increases from z ~ 3 to z ~ 4. The small-scale clustering amplitude is comparable to or lower than power-law extrapolations (with slope gamma=2) from the large-scale correlation function of the i<20.2 quasar sample from the Sloan Digital Sky Survey. Using simple prescriptions relating quasars to dark matter halos, we model the observed small-scale clustering with halo occupation models. Reproducing the large-scale clustering amplitude requires that the active fraction of the black holes in the central galaxies of halos is near unity, but the level of small-scale clustering favors an active fraction of black holes in satellite galaxies 0.1 <~ f_s <~ 0.5 at z >~ 3.