photometric redshift (photoz) based on intermediate bands & broad bands

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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 - PowerPoint PPT Presentation

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  • Photometric Redshift (PhotoZ)Based on Intermediate bands & Broad bands Yan-Bin, Yang Collaborators: .Xu, Zhou Li-Fang, Xia Zhong-Lue, Wen (National Astronomical Observatories, CAS)

    Qi-Rong, Yuan (Department of Physics, Nanjing Normal University)

    2005-11-23, (Wei-Hai)

  • OutlineIntroductionRedshift, SED, z-SED Basic methodsPhotometric SystemsPhotoZ by BATC and BATC+SDSSPhotoZ by SDSSStar-SED and galaxy SED

  • Introduction

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

  • Basic methods - IIKoo 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 - IPuschell 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, 891BATC only

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

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

  • CCR ~ 0.024

  • Many Thanks

  • Many Thanks

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