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) , 威海 (Wei-Hai)

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

Introduction

V  Redshift (z)

Sepctral Energy Distribution (SED)

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

Basic methods

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

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

Other methods Artificial Neural Network (ANN) Vanzella et al. 2004A&A V Collister & Lahav 2004PASP C Bayesian estimation Benitez 2000ApJ B

Photometric Systems

BATC (Beijing-Arizona-Taiwan-Connecticut)

Filter system of BATC

SDSS Sloan Digital Sky Survey

Filter system of SDSS

PhotoZ by BATC and BATC+SDSS

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

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

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

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

PhotoZ by SDSS

Previous works Chisq-minimaztion Padmanabhan et al. 2005MNRAS P Artificial Neural Network (ANN) Vanzella et al. 2004A&A V Collister & Lahav 2004PASP C

PhotoZ by SDSS (Yang et al. 2005)

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

CCR

σ ~ CCR

Many Thanks