We present the result of projected cross correlation analysis of AGNs and galaxies at redshifts from 0.3 to 3.0 .
The Japanese Virtual Observatory ( JVO ) was used to obtain the Subaru Suprime-Cam images and UKIDSS catalog data around AGNs .
We investigated 1,809 AGNs , which is about ten times larger a sample than that used in previous studies on AGN-galaxy clustering at redshifts larger than 0.6 .
90 % of the AGN samples are optically-selected AGN from the SDSS and 2dF catalogs .
The galaxy samples at low redshift includes many redder objects from UKIDSS survey , while at higher redshift they are mainly blue galaxies from Suprime-Cam .
We found significant excess of galaxies around the AGNs at redshifts from 0.3 to 1.8 .
For the low redshift samples ( z < 0.9 ) , we obtained correlation length of r _ { 0 } = 5–6Â h ^ { -1 } Mpc ( \gamma = 1.8 ) , which indicates that the AGNs at this redshift range reside in a similar environment around typical local galaxies .
We also found that AGNs at higher redshift ranges reside in a denser environment than lower redshift AGNs ; For z = 1.3 \sim 1.8 AGNs , the cross correlation length was measured as 11 ^ { +6 } _ { -3 } Â h ^ { -1 } Mpc ( \gamma = 1.8 ) .
Considering that our galaxies sample is based on optical observations with Suprime-Cam at the redshift range , it is expected that blue star-forming galaxies comprise the majority of objects that are observed to be clustered around the AGNs .
It is successfully demonstrated that the use of the archive through the Virtual Observatory system can provide a powerful tool for investigating the small scale environment of the intermediate redshift AGNs .