2. Photometric Redshift (PhotoZ) Based on Intermediate bands & Broad bands Yan-Bin, Yang 杨雁宾 Collaborators: Collaborators:. Xu, Zhou 周旭 Li-Fang, Xia 夏丽芳 Zhong-Lue, Wen 文中略 (National Astronomical Observatories, CAS) Qi-Rong, Yuan 袁启荣 (Department of Physics, Nanjing Normal University) 2005-11-23, 威海 (Wei-Hai)

3. Outline Introduction Redshift, SED, z-SED Basic methods Photometric Systems PhotoZ by BATC and BATC+SDSS PhotoZ by SDSS Star-SED and galaxy SED

4. Introduction

5. V  Redshift (z)

6. Sepctral Energy Distribution (SED)

8. Problems of Extra-Galactic Research, Proceedings from IAU Symposium no. 15. (1962IAUS...15..390B )

10. Basic methods

11. Basic methods - I Puschell et al. 1982ApJ...257L..57P Bolzonella et al. 2000A&A...363..476B (HYPERZ) Padmanabhan et al. 2005MNRAS.359..237P

12. Basic methods - II Koo 1999ASPC..191....3K (and references therein) Connolly et al. 1995AJ....110.2655C Wang et al. 1998AJ....116.2081W

13. Other methods Artificial Neural Network (ANN) Vanzella et al. 2004A&A...423..761V Collister & Lahav 2004PASP..116..345C Bayesian estimation Benitez 2000ApJ...536..571B

14. Photometric Systems

15. BATC (Beijing-Arizona-Taiwan-Connecticut)

17. Filter system of BATC

18. SDSS Sloan Digital Sky Survey

19. Filter system of SDSS

20. PhotoZ by BATC and BATC+SDSS

21. Basic methods - I Puschell et al. 1982ApJ...257L..57P Bolzonella et al. 2000A&A...363..476B (HYPERZ) Padmanabhan et al. 2005MNRAS.359..237P

22. Zhou et al. 2003, PASJ, 55, 891 BATC only

23. Yuan et al. 2001, AJ, 122, 1718 BATC only

24. Yuan et al. 2003, ApJS, 149, 53 Yang et al. 2004, ApJ, 600, 141 BATC+SDSS

25. PhotoZ by SDSS

26. Previous works Chisq-minimaztion Padmanabhan et al. 2005MNRAS.359..237P Artificial Neural Network (ANN) Vanzella et al. 2004A&A...423..761V Collister & Lahav 2004PASP..116..345C

27. PhotoZ by SDSS (Yang et al. 2005)

28. Chisq^2 Color-color-redshift (CCR) relation Linear correction

29. CCR

32. σ ~ 0.024 CCR

35. Many Thanks