VIMOS 171.A-3045

Raw data and calibration files become immediately public, and can be retrieved through the ESO Science Archive Facility-VIMOS Data Products (follow the links in the table below).

The proposal is available here: gzipped ps file (220KB)

 

A VIMOS pointing (left). The VIMOS coverage of the GOODS field (right).

The cumulative source counts on the CDF-S field taken from the deep public FORS1 data, shows that at the limit of the VIMOS capability (V_AB=25) there are ~6000 objects over the 160 arcmin² of the GOODS field, or ~37 arcmin^-2. Moreover, the VIMOS geometry (16' x 18', with a cross gap of 2' between the quadrants) is such that only 50% of it can overlap with the 10' x 16' GOODS field. Hence up to 400 objects at a time can be observed. 4 VIMOS pointings are required to cover the whole GOODS area. 24 masks (6 per pointing) are necessary to ensure ~96% completeness in the spectroscopic coverage of ~6000 targets. With an average integration time of 4h per mask and 30% overheads, this makes a total of 125h.

The VIMOS spectroscopic campaign is designed to complement the FORS2 spectroscopic program. A Medium resolution campaign in the red (VIMOS MR_orange grism) is dedicated to reaching the required completeness in the 0.5 < z < 1.3 redshift range. A low resolution spectroscopic campaign is conducted with the VIMOS LR_Blue grism to cover the 2.3 < z < 3.5 redshift range not considered by the FORS2 spectroscopy. The target selection is based on BzK objects (see for detail Daddi et al. 2004), u-dropouts, sub-u-dropouts and Chandra sources. The table below shows for the variuos redshift intervals the features most useful for redshift determination, and the most appropriate instrument/grism combination for detecting such features.

Send comments to <goods@eso.org>  Last modified: Thu Oct 20 14:21:50 MEST 2005