Title: AGN and Galaxy Clustering at z = 0.3 to 3.0 using the Japanese Virtual Observatory.

Author(s): Y. Shirasaki, M. Tanaka, M. Ohishi, Y. Mizumoto, T. Takata, N. Yasuda

Abstract: We present the result of the projected cross correlation analysis 
of the AGNs and galaxies at redshifts from 0.3 to 3.0.
We used the Japanese Virtual Observatory (JVO) to obtain the
Subaru Suprime-Cam images around the known QSOs.
We investigated 647 AGNs, which is about ten times larger samples
than previously published observations, and found significant excess 
of galaxies around the AGN at redshifts of 0.3 to 1.6. 
The obtained clustering parameters are:

r0 = 3.71 +- 0.54 Mpc, gamma = 1.90 +- 0.13 for z = 0.3 ~ 0.8,
r0 = 5.18 +- 0.70 Mpc, gamma = 1.79 +- 0.12 for z = 0.8 ~ 1.2, and
r0 = 5.53 +- 1.22 Mpc, gamma = 1.70 +- 0.22 for z = 1.2 ~ 1.6.

These results are consistent with the other measurements.
For AGNs at higher redshift, we could not obtain a significant 
clustering signature and put an upper limit of r0 < 7.2 Mpc (99% C.L.)
assuming gamma = 1.8.
Our result implies that the Japanese Virtual Observatory can
be a powerful tool to investigate the large scale structure 
of the intermediate redshift Universe.