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Published August 20, 2010 | Published
Journal Article Open

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


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 ≳ 10^(13) h^(–1) M_☉) satellite halos f_s ≳ 0.1 at z ≳ 3.

Additional Information

© 2010 American Astronomical Society. Received 2009 August 25; accepted 2010 March 19; published 2010 August 3. We thank the anonymous referee for useful comments and Silvia Bonoli, Charlie Conroy, Phil Hopkins, and Linhua Jiang for helpful discussions. This work was partially supported by NSF grants AST-0707266 (Y.S. and M.A.S.) and AST-0607634 (D.P.S.). Y.S. acknowledges partial support from a Clay Postdoctoral Fellowship through the Smithsonian Astrophysical Observatory (SAO). F.S. acknowledges partial support from NASA 17 Although we do not have the adequate simulation data set, we compared the Giocoli et al. subhalo mass function with the alternative prescription in Tinker & Conroy (2009). We found that the difference in the two subhalo mass functions has negligible effects on our conclusions. grant NNG05GH77G and from the Alexander von Humboldt Foundation. S.G.D. and A.M. acknowledge partial support from NSF grant AST-0407448 and the Ajax Foundation.

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August 22, 2023
October 20, 2023