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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51 Scopus citations


We present measurements of the small-scale (0.1 ≲ r ≲ 1 h -1 Mpc) 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. 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 (assuming a fixed slope γ = 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. We found that the level of small-scale clustering favors an active fraction of black holes in (M ≳ 1013 h-1 M) satellite halos fs ≳ 0.1 at z ≳ 3.

Original languageEnglish (US)
Pages (from-to)1693-1698
Number of pages6
JournalAstrophysical Journal
Issue number2
StatePublished - Aug 20 2010

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Black hole physics
  • Cosmology: observations
  • Galaxies: active
  • Large-scale structure of universe
  • Quasars: general
  • Surveys


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