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Photometric Redshift (PhotoZ) Based on Intermediate bands & Broad bands

Photometric Redshift (PhotoZ) Based on Intermediate bands & Broad bands. Yan-Bin, Yang 杨雁宾 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

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Photometric Redshift (PhotoZ) Based on Intermediate bands & Broad bands

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  1. Photometric Redshift (PhotoZ)Based on Intermediate bands & Broad bands Yan-Bin, Yang 杨雁宾 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)

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

  3. Introduction

  4. V  Redshift (z)

  5. Sepctral Energy Distribution (SED)

  6. Sepctral Energy Distribution (SED)

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

  8. Basic methods

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

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

  11. Other methods • Artificial Neural Network (ANN)Vanzella et al. 2004A&A...423..761VCollister & Lahav 2004PASP..116..345C • Bayesian estimationBenitez 2000ApJ...536..571B

  12. Photometric Systems

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

  14. Filter system of BATC

  15. SDSS Sloan Digital Sky Survey

  16. Filter system of SDSS

  17. PhotoZ by BATC and BATC+SDSS

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

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

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

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

  22. PhotoZ by SDSS

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

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

  25. PhotoZ by SDSS (Yang et al. 2005) • Chisq^2 • Color-color-redshift (CCR) relation • Linear correction

  26. CCR

  27. CCR

  28. CCR

  29. CCR σ ~ 0.024

  30. Many Thanks

  31. Many Thanks

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