1. 6dF Galaxy Survey Workshop Sydney Ophiuchus Supercluster and its Surroundings K. Wakamatsu, M.Nishida, M. Malkan, Q. Parker, W. Saunders, F. Watson

2. Ophiuchus cluster Discovered on Palomar Schmidt IV-N Plates (1981) during Our Hidden Globular Cluster Survey l=0.5° b=+9.3 °(Near the Galactic Center) A B =2.5 mag A rich cD cluster at cz=9000 km/s 2 nd brightest X-Ray cluster (after Perseus cluster in the sky) with kT=10 keV

3. Norma Ophiuchus x 5 luminous

4. Questions Basic Properties of the cluster e.g., velocity dispersion, angular extent Supercluster? A key cluster connected with wall structures? (SGL=173, SGB=44, cz= 9000 km/s) Massive enough to influence on the Great Attractor issue? Extensive studies in X-ray, but few in optical

5. Core of the Ophiuchus cluster in R-Band (Taken by Ebeling with UH 88-inch telescope)

6. 1. Optical Galaxy Survey On SERC J-Sky Survey Films Eye survey with a binocular-type microscope We detected 4158 galaxies for 6 Schmidt fields (453,454,516,517,586,587) We Measured.Angular size > 4 arcsec.Magnitude Class 1 (bright) – 5(faint).Morphological types (S, E, compact, … )

7. ● : MC 1 ● : MC 2 ● :MC 3 Distribution of Galaxies with magnitude classes

8. 2. Identification to 2MASS Positional coincidence < 10 arcsec Among 4158 galaxies, 1471 objects are identified to 2MASS sources.

9. Cluster Core region 0.3 x 0.3 deg Galaxies missed in 2MASS are Marked with

10. Examples of 2MASS images 35 % of ours have 2MASS counterparts, 50 % of 2MASS sources have our counterparts

11. 2Mass Identification Rate over Optical poorer bellow b<8°

12. 2MASS Identification Rate for Optical Brightness Quite incomplete at optically faint galaxies

13. 2MASS Identification Rate for Optical Angular Size Quite Incomplete at small-size galaxies

14. 3. Redshift Survey with FLAIR II & 6dF Survey area: ☆ Ophiuchus cluster region ☆ Extending towords the Hercules cluster ☆ Crossing the Galactic Plane We put fibers more than 3000 targets 3800 < λ < 7500 (3.7 A/pixel) 3-4 hours for a field for low b Nice to detect H,K,G-lines with 6dF even for Ophiuchus galaxies

15. Target Galaxies for FLAIR & 6dF Redshift Survey Hercules cluster

16. Damaged Spectrum by a foreground star light

17. Damaged Spectrum by Galactic Emission Lines

18. Success rate for cz measuring

19. 4. Structure of Ophiuchus cluster d< 1 deg d< 2 deg d< 3 deg d< 5 deg

20. A compact core & adjunct clusters

21. Mean cz : 9030 km/s Dispersion: 1000 km/s 54 91 121 143 173 221 249 304 dispersion mean cz For galaxies 7,000 < cz < 10,500 km/s

23. 5. Large Scale Structure around the Ophiuchus Cluster

24. A wall structure extends towards the Hercules supercluster

25. A wall connecting between Oph- and Her-superclusters Oph Her

26. Prominent peak around cz=9000 km/s=> Ophiuchus supercluster d< 5 deg d< 10 deg d< 15 deg d< 20 deg

27. A void extends to cz = 4,000 km/s

28. Future Works 1. A Deep Galaxy Survey with a Japanese telescope at SAAO 2MASS(1.3m) New(1.4m) exp. time (sec) 7.8 600 scale (arcsec/pix) 2.0 0.45 2. Photometry of galaxies => luminosity function 3. Large-scale structure with DR2

29. 1.4m IR telescope at Sutherland, SAAO

30. Digital Sky Survey J,H, K Survey with the 1.4m telescope at SAAO Ophiuchus cluster (7’ x 7’)

31. Summary 1. Ophiuchus cluster has a large velocity dispersion as expected from its large X-ray luminosity 2. It accompanies several clusters within 6 deg, forming a supercluster 3. A wall structure extends toward the Hercules supercluster 4. A large void extends upto v = 4000 km/s

32. VIVA! April 26-27, 05 At Sydney 6dF Redshift Survey can go deep into the Galactic Plane

33. Few galaxies cz the Local Void A few galaxies cz Extension of the Local Void d< 30 deg