1. Subaru Observations of Galaxy Clusters at z<1.3 Masayuki Tanaka (University of Tokyo) Tadayuki Kodama (NAOJ) + the PISCES team

2. Outline 1 – Observations 2 – Large-Scale Structures 3 – Color-Magnitude Diagrams 4 – Spectral Diagnostics 5 – Summary

3. 1 – Observations Mauna Kea Observatories

4. redshift z=0 z=0.55 (5.4Gyr) z=0.83 (7.0Gyr) Object Photometry Spectroscopy Sloan Digital Sky Survey u g r i z ~260,000 objects (DR2) Suprime-Cam (Subaru) B V R i z FOCAS (Subaru) ~200 objects Suprime-Cam (Subaru) V R i z FOCAS (Subaru) ~300 objects CL0016 RXJ0152

5. Photo-z accuracy

6. 2 – Large-Scale Structures Millenium Simulation

7. Large-Scale Structures in the Local Universe data from SDSS DR4

8. CL0016 at z=0.55 ACS/ HST Color composition by Ichi Tanaka

9. CL0016 at z=0.55 ACS/ HST Color composition by Ichi Tanaka

10. Large-Scale Structures CL0016 at z=0.55

11. Large-Scale Structures CL0016 at z=0.55 spec. objects at 0.54<z<0.56 spec. objects outside of 0.54<z<0.56 z=0.549 z=0.547 z=0.548 z=0.547 z=0.542 Someone et al in prep.

12. RXJ0152 at z=0.83 Color composition by Ichi Tanaka

13. RXJ0152 at z=0.83 Large-Scale Structures Tanaka et al. 2006 MNRAS 365, 1392

14. RXJ0152 at z=0.83 Large-Scale Structures z=0.844 z=0.842 z=0.745 z=0.782 z=0.835 z=0.837 z=0.839 z=0.844 spec. objects at 0.82<z<0.85 spec. objects outside of 0.82<z<0.85 Tanaka et al. 2006 MNRAS 365, 1392

15. RXJ1716 at z=0.81 MS1054 at z=0.83 RDCSJ0910 at z=1.1 RDCSJ1252 at z=1.24 Koyama et al. in prep. Tanaka et al. MNRAS submitted Structures around other high-z clusters

16. 3 – Color-Magnitude Diagrams Time Color Environment luminosity

17. Local / Global Density local density + global density (nearest-neighbor density) (density within r=2Mpc aperture) Field :  local <  break Group :  local >  break +  global <  break Cluster ：  local >  break +  global >  break

18. Cluster / Group / Field Environments redshift z=0 z=0.55 z=0.83 Tanaka et al. 2005 MNRAS 362, 268

19. Colour-Magnitude Diagrams red blue z=0 z=0.55 z=0.83 redshift massive less massive Tanaka et al. 2005 MNRAS 362, 268

20. Colour Dispersion around CMR z=0.83 z=0.55 z=0

21. Giant-to-Dwarf ratio of red galaxies z=0.8 z=0.5 z=0 Tanaka et al. 2005 MNRAS 362, 268 Giant : 10.6<log (M steller /M solar ) Dwarf: 9.7 < log (M steller /M solar ) < 10.6

22. Giant : 10.6<log (M steller /M solar ) Dwarf: 9.7 < log (M steller /M solar ) < 10.6 Tanaka et al. 2005 MNRAS 362, 268 Giant-to-Dwarf ratio z=0.8 z=0.5 z=0 1) Galaxies follow the 'down-sizing' evolution. 2) The 'down-sizing' is delayed in low-density environments.

23. Colour Dispersion around CMR z=0.83 z=0.55 z=0 1) Galaxies follow the 'down-sizing' evolution. 2) 'Down-sizing' is delayed in low-density environments.

24. 4 – Spectral Diagnostics

25. Composite Spectra of Red Galaxies at z~0.8 Tanaka et al. 2006 MNRAS 365, 1392

26. D4000 and Hd D4000 Hd D4000 monotonically changes with time. Hd shows a peak after 0.1 – 1 Gyr of the last episode of star formation.

27. Model Star Formation Histories time star formation rate SSP model tau model burst model Bruzual & Charlot 2003 Model : Chabrier IMF between 0.1-100Msolar Solar Metallicity, No dust extinction

28. Spectral Diagnostics – SSP model grids: Bruzual & Charlot 2003 contours : galaxies at z=0 preliminary

29. Spectral Diagnostics – tau model model grids: Bruzual & Charlot 2003 contours : galaxies at z=0 preliminary

30. Spectral Diagnostics – burst model model grids: Bruzual & Charlot 2003 contours : galaxies at z=0 preliminary

31. 5 – Summary

32. Schematic View of Galaxy Evolution Environment Mass Time

33. Environment Mass Time Schematic View of Galaxy Evolution

34. Environment Mass Time Schematic View of Galaxy Evolution

35. Environment Mass Time Schematic View of Galaxy Evolution

36. Environment Mass Time Schematic View of Galaxy Evolution

37. Environment Mass Time Schematic View of Galaxy Evolution

38. Photometric Redshifts from VRiz photometry Redshifts of very blue galaxies deviate....