Abstract details

We introduce two on-going projects with Subaru on high density regions. (1) PISCES survey: With the wide field camera Suprime-Cam ($30'$) (+NIR for high-$z$ sample), we are mapping out large scale structures around distant clusters at $0.42$ which are known to show many associated emitters. We see overdensity of JHK selected galaxies which are probably associated evolved populations. Those massive NIR selected galaxies track similar structures traced by the emitters but show little individual overlap, suggesting that the down-sizing is already seen in the proto-clusters.