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arXiv · 0908.3908

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

Yue Shen·Joseph F. Hennawi·Francesco Shankar·Adam D. Myers·Michael A. Strauss·S. G. Djorgovski·Xiaohui Fan·Carlo Giocoli·Ashish Mahabal·Donald P. Schneider·David H. Weinberg
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Abstract

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.

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Yue Shen, Joseph F. Hennawi, Francesco Shankar, Adam D. Myers, Michael A. Strauss, S. G. Djorgovski, Xiaohui Fan, Carlo Giocoli, Ashish Mahabal, Donald P. Schneider, David H. Weinberg. 2009-08-26. Binary Quasars at High Redshift II: Sub-Mpc Clustering at z ~ 3-4. https://doi.org/10.1088/0004-637x%2F719%2F2%2F1693

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