Clustering Analyses of 300,000 Photometrically Classified Quasars. II. The Excess on Very Small Scales

We study quasar clustering on small scales, modeling clustering amplitudes using halo-driven dark matter descriptions. From 91 pairs on scales 5 times higher at z > 2, than at z 2 could be consistent with reduced merger rates at z > 2 for the galaxies forming UVX quasars. Comparing our clustering at ~28 kpc/h to a \ (r) = (r/4. 8\) ^-1. 53 power-law, we find an upper limit on any excess of a factor of 4. 3+/-1. 3, which, noting some caveats, differs from large excesses recently measured for binary quasars, at 2. 2\. We speculate that binary quasar surveys that are biased to z > 2 may find inflated clustering excesses when compared to models fit at z < 2. We provide details of 111 photometrically classified quasar pairs with separations <0. 1'. Spectroscopy of these pairs could significantly constrain quasar dynamics in merging galaxies.