Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-10-26
Astronomy and Astrophysics
Astrophysics
2 pages. To appear in the proceedings of the 1999 Marseille International Conference "Clustering at High Redshift", A. Mazure,
Scientific paper
Using EFOSC2 at the 3.6m ESO telescope, we obtained redshifts for 68 galaxies in the field of six cluster candidates from the ESO Imaging Survey (EIS). The cluster candidates were selected in the EIS patches C and D and have estimated mean redshifts between z=0.5 and z=0.7. In the six candidate cluster fields, we identify possible systems of galaxies in the redshift space. The likelihoods of these systems are established by comparison with random resamplings of the Canada-France Redshift Surveys, and using the redshift distribution expected from Postman et al.'s luminosity function, with Poggianti's K- and evolutionary-corrections. Four of the six candidate EIS clusters are found to correspond to a real system in the redshift space, with > 95 % probability. Two of them have a mean redshift in agreement with the estimate from the matched filter algorithm, while the other two have a significantly smaller redshift. The independent analysis of the V-I vs. I color-magnitude diagrams for five of our six cluster fields, supports our conclusions based on the spectroscopic data.
Bardelli Sandro
Biviano Andrea
Borgani Stefano
Boschin Walter
da Costa Luiz Nicolaci
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