IAU00626
Presentation type requested: POSTER
SPECTROSCOPY OF HIGH-REDSHIFT EIS CLUSTER CANDIDATES
Lisbeth F Olsen
Copenhagen University Observatory
We report on the results of an ambitious follow-up program of the ESO Imaging Survey (EIS) cluster candidates. Using a variety of instruments we are carrying out photometric and spectroscopic follow-up programs of all the 310 cluster candidates in the catalogue. Here we report the results of our first VLT observations using FORS (1 and 2) in order to obtain spectroscopic confirmations of 8 high-redshift systems. From the identification of the candidates the estimated redshifts range from 0.6 to 1.1. We confirm 6 of the 8 systems to be 3D-concentrations with spectroscopic redshifts consistent with the original estimates. For the remaining two systems the data are inconclusive. In particular we confirm two of the systems to be at z>1. Not all of the systems look relaxed (in particular not the ones at z>1) and we suggest that these are more likely to be filaments than clusters.
Bardelli Sandro , Benoist Christophe , Biviano Andrea , Da costa Luiz , Jorgensen Henning , Ramella Massimo , Scodeggio Marco , Zucca Elena
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