Photometric Redshift (PhotoZ)Based on Intermediate bands & Broad bands Yan-Bin, Yang Yan-Bin, Yang 杨雁宾杨雁宾Collaborators: Collaborators: .Xu, Zhou Xu, Zhou 周旭周旭Li-Fang, Xia Li-Fang, Xia 夏丽芳夏丽芳Zhong-Lue, Wen Zhong-Lue, Wen 文中略文中略(National Astronomical Observatories, CAS)(National Astronomical Observatories, CAS)Qi-Rong, Yuan Qi-Rong, Yuan 袁启荣袁启荣(Department of Physics, Nanjing Normal University)(Department of Physics, Nanjing Normal University)
2005-11-23, 2005-11-23, 威海 威海 (Wei-Hai)(Wei-Hai)
OutlineIntroduction
Redshift, SED, z-SED Basic methodsPhotometric SystemsPhotoZ by BATC and BATC+SDSSPhotoZ by SDSSStar-SED and galaxy SED
Introduction
V
Redshift (z)
Sepctral Energy Distribution (SED)
Sepctral Energy Distribution (SED)
Problems of Extra-Galactic Research, Proceedings from IAU Symposium no. 15.(1962IAUS...15..390B )
Basic methods
Basic methods - I
Puschell et al. 1982ApJ...257L..57P Bolzonella et al. 2000A&A...363..476B (HYPERZ)Padmanabhan et al. 2005MNRAS.359..237P
Basic methods - II
Koo 1999ASPC..191....3K (and references therein)Connolly et al. 1995AJ....110.2655CWang et al. 1998AJ....116.2081W
Other methods Artificial Neural Network (ANN) Vanzella et al. 2004A&A...423..761V Collister & Lahav 2004PASP..116..345CBayesian estimation Benitez 2000ApJ...536..571B
Photometric Systems
BATC(Beijing-Arizona-Taiwan-Connecticut)
Filter system of BATC
SDSSSloan 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...363..476B (HYPERZ)Padmanabhan et al. 2005MNRAS.359..237P
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 worksChisq-minimaztion Padmanabhan et al. 2005MNRAS.359..237PArtificial Neural Network (ANN) Vanzella et al. 2004A&A...423..761V Collister & Lahav 2004PASP..116..345C
PhotoZ by SDSS (Yang et al. 2005)
PhotoZ by SDSS (Yang et al. 2005)Chisq^2
Color-color-redshift (CCR) relationLinear correction
CCR
CCR
CCR
σ ~ 0.024
CCR
Many Thanks
Many Thanks