A catalogue of the Chandra Deep Field South with multi-colour classification and photometric redshifts from COMBO-17

C. Wolf, K. Meisenheimer, M. Kleinheinrich, A. Borch, S. Dye, M. Gray, L. Wisotzki, E. F. Bell, H. W. Rix, A. Cimatti, G. Hasinger, G. Szokoly

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Abstract

We present the COMBO-17 object catalogue of the Chandra Deep Field South for public use, covering a field which is 31′.5 × 30′ in size. This catalogue lists astrometry, photometry in 17 passbands from 350 to 930 nm, and ground-based morphological data for 63 501 objects. The catalogue also contains multi-colour classification into the categories Star, Galaxy and Quasar as well as photometric redshifts. We include restframe luminosities in Johnson, SDSS and Bessell passbands and estimated errors. The redshifts are most reliable at R <24, where the sample contains approximately 100 quasars, 1000 stars and 10 000 galaxies. We use nearly 1000 spectroscopically identified objects in conjunction with detailed simulations to characterize the performance of COMBO-17. We show that the selection of quasars, more generally type-1 AGN, is nearly complete and minimally contaminated at z = [0.5, 5] for luminosities above MB = -21.7. Their photometric redshifts are accurate to roughly 5000 kms-1. Galaxy redshifts are accurate to 1% in δt(1 + z) at R <21. They degrade in quality for progressively fainter galaxies, reaching accuracies of 2% for galaxies with R ∼ 22 and of 10% for galaxies with R > 24. The selection of stars is complete to R ∼ 23, and deeper for M stars. We also present an updated discussion of our classification technique with maps of survey completeness, and discuss possible failures of the statistical classification in the faint regime at R ≳ 24.

Original languageEnglish
Pages (from-to)913-936
Number of pages24
JournalAstronomy and Astrophysics
Volume421
Issue number3
DOIs
Publication statusPublished - Jul 2004

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Keywords

  • Catalogs
  • Galaxies: general
  • Methods: observational
  • Surveys
  • Techniques: photometric

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

A catalogue of the Chandra Deep Field South with multi-colour classification and photometric redshifts from COMBO-17. / Wolf, C.; Meisenheimer, K.; Kleinheinrich, M.; Borch, A.; Dye, S.; Gray, M.; Wisotzki, L.; Bell, E. F.; Rix, H. W.; Cimatti, A.; Hasinger, G.; Szokoly, G.

In: Astronomy and Astrophysics, Vol. 421, No. 3, 07.2004, p. 913-936.

Research output: Contribution to journalArticle

Wolf, C, Meisenheimer, K, Kleinheinrich, M, Borch, A, Dye, S, Gray, M, Wisotzki, L, Bell, EF, Rix, HW, Cimatti, A, Hasinger, G & Szokoly, G 2004, 'A catalogue of the Chandra Deep Field South with multi-colour classification and photometric redshifts from COMBO-17', Astronomy and Astrophysics, vol. 421, no. 3, pp. 913-936. https://doi.org/10.1051/0004-6361:20040525
Wolf, C. ; Meisenheimer, K. ; Kleinheinrich, M. ; Borch, A. ; Dye, S. ; Gray, M. ; Wisotzki, L. ; Bell, E. F. ; Rix, H. W. ; Cimatti, A. ; Hasinger, G. ; Szokoly, G. / A catalogue of the Chandra Deep Field South with multi-colour classification and photometric redshifts from COMBO-17. In: Astronomy and Astrophysics. 2004 ; Vol. 421, No. 3. pp. 913-936.
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AU - Dye, S.

AU - Gray, M.

AU - Wisotzki, L.

AU - Bell, E. F.

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AU - Szokoly, G.

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AB - We present the COMBO-17 object catalogue of the Chandra Deep Field South for public use, covering a field which is 31′.5 × 30′ in size. This catalogue lists astrometry, photometry in 17 passbands from 350 to 930 nm, and ground-based morphological data for 63 501 objects. The catalogue also contains multi-colour classification into the categories Star, Galaxy and Quasar as well as photometric redshifts. We include restframe luminosities in Johnson, SDSS and Bessell passbands and estimated errors. The redshifts are most reliable at R <24, where the sample contains approximately 100 quasars, 1000 stars and 10 000 galaxies. We use nearly 1000 spectroscopically identified objects in conjunction with detailed simulations to characterize the performance of COMBO-17. We show that the selection of quasars, more generally type-1 AGN, is nearly complete and minimally contaminated at z = [0.5, 5] for luminosities above MB = -21.7. Their photometric redshifts are accurate to roughly 5000 kms-1. Galaxy redshifts are accurate to 1% in δt(1 + z) at R <21. They degrade in quality for progressively fainter galaxies, reaching accuracies of 2% for galaxies with R ∼ 22 and of 10% for galaxies with R > 24. The selection of stars is complete to R ∼ 23, and deeper for M stars. We also present an updated discussion of our classification technique with maps of survey completeness, and discuss possible failures of the statistical classification in the faint regime at R ≳ 24.

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