The public COMBO-17 CDFS data:
CALIBRATION UPDATE:
12 September 2008 -- changes redshifts and rest-frame colours
We present the COMBO-17 object catalogue on the Chandra Deep Field South for
public use, covering a field which is 31.5'x 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 10000 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 M_B=-21.7. Their photometric
redshifts are accurate to roughly 5000 km/sec. Galaxy redshifts are accurate to 1% in dz/(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.
The
update paper
(Wolf et al., 2008, A&A Research Note,submitted)
The dataset (2008 update):
The ReadMe file for the ASCII catalogue in CDS format
The ASCII catalogue (60 MB) and The FITS catalogue (33 MB)
The U-band image
The B-band image
The V-band image
The R-band image
The I-band image