VLT and NTT Observations of Two EIS Cluster Candidates. Detection of the Early-Type Galaxies Sequence at z~1

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dc.creatorda Costa, L.
dc.creatorScodeggio, M.
dc.creatorOlsen, L. F.
dc.creatorNonino, M.
dc.creatorRengelink, R.
dc.creatorBender, R.
dc.creatorFranx, M.
dc.creatorJorgensen, H. E.
dc.creatorRenzini, A.
dc.creatorRosati, P.
dc.date1999-01-19
dc.date.accessioned2026-07-07T02:30:04Z
dc.date.available2026-07-07T02:30:04Z
dc.descriptionOptical data from the ESO VLT-UT1 Science Verification observations are combined with near-infrared data from SOFI at the NTT to obtain optical-infrared color-magnitude diagrams for the objects in the fields of two EIS cluster candidates. In both cases, evidence is found for a well-defined sequence of red galaxies that appear to be significantly more clustered than the background population. These results suggest that the two systems are real physical associations. The (R-Ks), (I-Ks) and (J-Ks) colors of the red sequences are used, in conjunction with similar data for spectroscopically confirmed clusters, to obtain redshift estimates of z ~ 0.9 and z ~ 1.0 for these two systems. These results make these EIS cluster candidates prime targets for follow-up spectroscopic observations to confirm their reality and to measure more accurately their redshift.
dc.description6 pages, 5 figures, to appear in Astronomy & Astrophysics (Special Letters Edition on "First Science with the VLT")
dc.identifierhttps://arxiv.org/abs/astro-ph/9901248
dc.identifierhttp://arxiv.org/abs/astro-ph/9901248
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13705
dc.subjectAstrophysics
dc.titleVLT and NTT Observations of Two EIS Cluster Candidates. Detection of the Early-Type Galaxies Sequence at z~1
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