Quasar-Galaxy Clustering through Projected Galaxy Counts at z=0.6-1.2
  We investigate the spatial clustering of galaxies around quasars at redshifts
from 0.6 to 1.2 using the photometric data from Sloan Digital Sky Survey (SDSS)
Stripe 82. The quasar and galaxy cross-correlation functions are measured
through the projected galaxy number density n(r_p) on scales $0.05<r_p<20 h^-1
Mpc around quasars for a sample of 2300 quasars from Schneider et al. (2007).
We detect strong clustering signals at all redshifts, and find that the
clustering amplitude increases significantly with redshift. We examine the
dependence of the quasar-galaxy clustering on quasar and galaxy properties and
find that the clustering amplitude is significantly larger for quasars with
more massive black holes, or with bluer colors, while the dependence on quasar
luminosity is absent. We also show that quasars have a stronger correlation
amplitude with blue galaxies than with red galaxies. We finally discuss the
implication of our finding.
