The great observatories origins deep survey - VLT/VIMOS spectroscopy in the GOODS-south field

摘要

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 MRgrisms were used to cover different redshift ranges. Galaxies at 1.8 < z < 3.5 were observed in the GOODS VIMOS-LR-Blue campaign. Galaxies at z < 1 and Lyman Break Galaxies at z > 3.5 were observed in the VIMOS MRsurvey. 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 MRmasks. A large percentage, 33% of the LR-Blue and 18% of the MRspectra, 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 .The reliability of the redshift estimate varies with the qualityflag. The LR-Blue qualityflagA redshifts are reliable at 95% confidence level,flagB redshifs at 70% and quality C et 40%. The MRredshift reliability is somewhat higher: 100% for qualityflagA, 90% for quality flagB and 70% forflagC. 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 < 3.5, and it is very uncertain at higher redshift. The master catalog was used also to estimate completeness and contamination levels of different galaxy photometric selection techniques. The BzKselection method leads to a 86% complete sample of z > 1.4 galaxies at iAB < 25mag and with a contamination 23% of lower redshift objects. The so-called ``sub''-U-dropout and the U-dropout methods lead to an 80% complete galaxy sample at z > 1.4 and iAB < 25mag, with 24% low redshift contaminants. Key words: cosmology: observations - cosmology: large-scale structure of Universe - galaxies: evolution