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6 dF Galaxy Survey Workshop Sydney

6 dF Galaxy Survey Workshop Sydney. Ophiuchus Supercluster and its Surroundings. K. Wakamatsu, M.Nishida, M. Malkan, Q. Parker, W. Saunders, F. Watson. Ophiuchus cluster. Discovered on Palomar Schmidt IV-N Plates　(1981) during Our Hidden Globular Cluster Survey

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6 dF Galaxy Survey Workshop Sydney

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  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) AB =2.5 mag • A rich cD cluster at cz=9000 km/s • 2nd 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 onthe 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. Distribution of Galaxies with magnitude classes ●　: MC 2 ●　:MC 3 ●　: MC 1

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

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

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

  22. 5. Large Scale Structure around the Ophiuchus Cluster

  23. A wall structure extends towards the Hercules supercluster

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

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

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

  27. 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

  28. 1.4m IR telescope at Sutherland, SAAO

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

  30. 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

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

  32. d< 30 deg Few galaxies cz <2,000 km/s => the Local Void A few galaxies cz <4,000 km/s => Extension of the Local Void

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