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Studies Of Galaxy Clusters By BATC Large Field Multi-Color Sky Survey

Studies Of Galaxy Clusters By BATC Large Field Multi-Color Sky Survey. --- A brief review of the progresses in recent years Yanbin, Yang; Xu, Zhou BATC, National Astronomical Observatories, CAS 2005-06-09, 威海 (Wei-Hai). Outline. Introduction Observation of Clusters by BATC

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Studies Of Galaxy Clusters By BATC Large Field Multi-Color Sky Survey

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  1. Studies Of Galaxy Clusters By BATC Large Field Multi-Color Sky Survey --- A brief review of the progresses in recent years Yanbin, Yang; Xu, Zhou BATC, National Astronomical Observatories, CAS 2005-06-09, 威海 (Wei-Hai)

  2. Outline • Introduction • Observation of Clusters by BATC • Individual Cluster • Studies of A168 • Recent Works • Future Works

  3. Introduction

  4. A cluster picture • Clusters is related to large scale structures, and also to individual galaxies. • Give the curtial constrians on cosmology and galaxy evolution.

  5. ~0.03 0.1 Redshift ～1x1 sq deg 21 Magnitude

  6. Filter system of BATC

  7. Sepctral Energy Distribution (SED)

  8. Target Clusters Large field ~1x1 sq deg Multi-color 15-filters Nearby (z<0.1) rich clusters

  9. Observation of Clusters by BATC

  10. Target list I (in 1999)

  11. Target List II TA26

  12. TA27 Target List III

  13. Target List VI

  14. Individual Cluster Past works (< 2004)

  15. A2634 z=0.031, Yuan et al. 2001, AJ, 122, 1718

  16. A566 z=0.097, Zhou et al. 2003, PASJ, 55, 891

  17. A2255 z=0.08, Yuan et al. 2003, ApJS, 149, 53

  18. A168 z=0.045, Yang et al. 2004, ApJ, 600, 141

  19. Abell 168 “Large-Field Multicolor Study of A168: Subclusters, Dynamics, and Luminosity Functions” , Yang, Yanbin; Zhou, Xu; Yuan, Qirong; Jiang, Zhaoji; Ma, Jun; Wu, Hong; Chen, Jiansheng, The Astrophysical Journal, 2004, 600,141 “Chandra X-Ray Observations of Galaxy Cluster A168”, Yanbin Yang, Zhiying Huo, Xu Zhou, Suijian Xue, Shude Mao, Jun Ma, and Jiansheng Chen, The Astrophysical Journal, 2004, 614, 692

  20. Optical Study

  21. zphoto zspec Photometric Redshift and members 13 from BATC 5 from SDSS 1553 galalxies，18-band SED (r' <20 mag) 121 (zspec )+ 255 (zphoto ) 376 members and candidates

  22. Photometric redshift

  23. 光学研究：

  24. 光学研究：

  25. zphoto zspec Photometric Redshift and members 13 from BATC 5 from SDSS 1553 galalxies，18-band SED (r' <20 mag) 121 (zspec )+ 255 (zphoto ) 376 members and candidates

  26. an01 光学研究：

  27. an06 光学研究：

  28. X-ray center Optical center (Ulmer,M.~P., Wirth, G.~D., & Kowalski, M.~P. 1992, ApJ, 397, 430)

  29. Review3 光学研究：

  30. X-ray Study

  31. X 射线研究 Imaging2

  32. X 射线研究 Imaging3

  33. east north Ricker, P. M. Sarazin, C. L. 2001, ApJ, 561, 621

  34. Ulmer, et al. 1992, ApJ, 397, 430 A168 is a merging cluster. In 2004 In 2004 Ricker, P. M. Sarazin, C. L. 2001, ApJ, 561, 621

  35. Recent Works (In 2005)

  36. A399-401 (Yuan et al. 2005, ChJAA) • Spatial distribution • dynamics • A2634 (Wen et al.; submitted; receive the first refree’s report; submitted again) • Spatial distribution • Star formation (by PEGASE model) • A2255 (Yuan et al. 2005, submitted to ApJ) • Star formation; SDSS spectroscopic data • A119 (Yuan et al. in prep.) • A168 (Kim, et al. in prep.; an cooperation with Seoul Univ.) • Star formation, blue galaxies. • Searching Clusters in SDSS data (Yang et al. in prep.)

  37. Potometric redhsift with SDSS five bands (Yang et al. draft version) • △z ~ 0.025 (by more than 200,000 galaxies)

  38. Searching Clusters in SDSS data (Yang et al. draft version) • ~6500 cluster candidates over ~580 deg2 (11.2 clusters / deg2)

  39. Future Works

  40. What we have now? • Early studies focus on the member selection, spatial distribution, luminosity function and dynamics. • Recently, Yuan’s work (also Wen’s) push us into the study of Star formation in clusters. • Mature experiences in • Photometric redshit with intermediate and broad bands (Zhou, X.; Yuan, Q.R.; Yang, Y.B.; Xia, L.F.; Wen, Z.L.)

  41. RMS ~0.015 RMS ~0.023

  42. What we have now? • Early studies focus on the member selection, spatial distribution, luminosity function and dynamics. • Recently, Yuan’s work (also Wen’s)push us into the study of Star formation in clusters. • Mature experiences in • Photometric redshit with intermediate and broad bands (Zhou, X.; Yuan, Q.R.; Yang, Y.B.; Xia, L.F.; Wen, Z.L.) • PEGASE (Li, J.L.; Duan, Z.Y.;) • SSP (Ma, J., Wu, Z.Y.,) • SED analyser by 2 minimization motivated by Wang X.F.; Ma, J.; Zhou, X.; Korea cooperation (Yang, Y.B.)

  43. What we have now? 7. Multi-band data of • BATC : • Data of 20/36 Clusters (z<~0.1) is ready; • We have so many observations (>107 fields) • SDSS : Spectra & 5 broad bands • >15 fields are covered by SDSS • IR : 2MASS • UV: GALEX • X-ray : Chandra, ROSAT, Einstein, etc.

  44. Then, What we can talk about? • Membership, spatial characters, luminosity function, dynamical status. • Star formation in nearby cluster: metallicity, Age, star formation rate and compare them with field. • Galaxy evolution and dynamics of cluster: how merging processes trigger star formation.

  45. Many Thanks

  46. Zfixed = 0.0016 Age = 10 (-2,+4) Gyr E(B-V) = 1.35 (0.2)

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