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

We present the COMBO-17 object catalogue of the Chandra Deep Field South for public use, covering a field which is $31\farcm5$ $\times$ $30\arcmin$ 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 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 s -1 . Galaxy redshifts are accurate to 1% in $\delta_z/(1+z)$ at $R 24$. The selection of stars is complete to $R \sim 23$, 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 $R\ga 24$.