New spectroscopic confirmations of high-redshift galaxy clusters

Details New spectroscopic confirmations of high-redshift galaxy clusters New spectroscopic confirmations of high-redshift galaxy clusters

2005-09-02

arxiv.org/abs/astro-ph/0509040v2

Astronomy and Astrophysics

Astrophysics

14 pages, Accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20053433

We present new spectroscopic data in the field of five high-redshift (z>=0.6) candidate galaxy clusters, drawn from the EIS Cluster Candidate Catalog. A total of 327 spectra were obtained using FORS1 at the VLT, out of which 266 are galaxies with secure redshifts. In this paper, we use these data for confirming the existence of overdensities in redshift space at the approximate same location as the matched-filter detections in the projected distribution of galaxies from the EIS I-band imaging survey. The spectroscopic redshifts, associated to these overdensities, are consistent but, in general, somewhat lower than those predicted by the matched-filter technique. Combining the systems presented here with those analyzed earlier, we have spectroscopically confirmed a total of nine overdensities in the redshift range 0.6

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