The great observatories origins deep survey

Aims. We present the first results from the VIsible Multiobject Spectrograph (VIMOS) ESO/GOODS program of spectroscopy for faint galaxies in the Chandra Deep Field South (CDF-S). This program complements the FORS2 ESO/GOODS campaign. Methods. All 3312 spectra were obtained in service mode with VIMOS at the ESO/VLT UT3. The VIMOS LR-Blue and MR grisms were used to cover different redshift ranges. Galaxies at 1.8 3.5 were observed in the VIMOS MR survey. Results. Here we report results for the first 12 masks (out of 20 total). We extracted 2344 from 6 LR-Blue masks and 968 from 6 MR masks. A large percentage, 33% of the LR-Blue and 18% of the MR spectra, are serendipitous observations. We obtained 1481 and 656 redshifts in the LR-Blue and MR campaign, respectively, for a total success rate of 70% and 75%, respectively, which decrease to 63% and 68% when also the serendipitous targets are considered. The typical redshift accuracy is σz = 0.001. The reliability of the redshift estimate varies with the quality flag. The LR-Blue quality flag A redshifts are reliable at ∼95% confidence level, flag B redshifs at ∼70% and quality C et ∼40%. The MR redshift reliability is somewhat higher: 100% for quality flag A, ∼90% for quality flag B and ∼70% for flag C. By complementing our VIMOS spectroscopic catalog with all existing spectroscopic redshifts publicly available in the CDF-S, we created a redshift master catalog. By comparing this redshift compilation with different photometric redshift catalogs we estimate the completeness level of the CDF-S spectroscopic coverage in several redshift bins. Conclusions. The completeness level is very high, >60%, at z 1.4 galaxies at iAB 1.4 and iAB < 25 mag, with ∼24% low redshift contaminants.