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26 April 2024 |
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VLT and NTT Observations of Two EIS Cluster Candidates. Detection of the Early-Type Galaxies Sequence at z~1 | | L. da Costa
; M. Scodeggio
; L.F. Olsen
; M. Nonino
; R. Rengelink
; R. Bender
; M. Franx
; H.E. Jorgensen
; A. Renzini
; P. Rosati
; | | Date: |
19 Dec 1998 | | Subject: | astro-ph | | Affiliation: | 1,2), M. Nonino(1,3), R. Rengelink, R. Bender, M. Franx, H.E. Jorgensen, A. Renzini, P. Rosati ( European Southern Observatory, Astronomisk Observatorium, Copenhagen, Osservatorio Astronomico di Trieste, Universitats-Sternwarte, Munchen, Leiden Ob | | Abstract: | Optical 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. | | Source: | arXiv, astro-ph/9901248 | | Services: | Forum | Review | PDF | Favorites | |
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