J/A+A/442/841 High-redshift galaxy clusters (Olsen+, 2005)
New spectroscopic confirmations of high-redshift galaxy clusters.
Olsen L.F., Zucca E., Bardelli S., Benoist C., Da Costa L., Jorgensen H.E.,
Biviano A., Ramella M.
<Astron. Astrophys., 442, 841-849 (2005)>
=2005A&A...442..841O 2005A&A...442..841O
ADC_Keywords: Clusters, galaxy ; Redshifts
Keywords: cosmology: observations - galaxies: distances and redshifts -
galaxies: clusters: general
Abstract:
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<z<1.3, providing an important first step in
building an optically-selected, high-redshift sample for more detailed
studies, complementing those based on the few available X-ray selected
systems.
Description:
The observations were carried out in the nights September 21-25, 2000,
using FORS1 mounted at the VLT-ANTU telescope.
Objects:
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RA (2000) DE Designation(s)
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00 46 07.4 -29 51 44.5 EISJ0046-2951
00 48 31.6 -29 42 52.1 EISJ0048-2942
00 50 04.4 -29 41 35.6 EISJ0050-2941
22 36 18.0 -40 17 54.9 EISJ2236-4017
22 49 33.0 -39 58 10.1 EISJ2249-3958
-------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea.dat 56 276 List of measured redshifts for the clusters
EISJ0046-2951, EISJ0048-2942, EISJ0050-2941,
EISJ2236-4017 and EISJ2249-3958
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See also:
J/A+A/379/740 : ESO Imaging Survey (EIS) (Arnouts+, 2001)
J/A+A/384/81 : ESO Imaging Survey. CDF-S point sources (Hatziminaoglou+, 2002)
J/A+A/392/741 : EIS Stellar Catalogue in the Chandra DFS (Groenewegen+ 2002)
J/A+A/452/119 : EIS infrared observations of CDF-S and HDF-S (Olsen+, 2006)
J/A+AS/137/75 : ESO Imaging Survey. IV. (Zaggia+, 1999)
J/A+AS/137/83 : ESO Imaging Survey. VII. (Scodeggio+, 1999)
Byte-by-byte Description of file: tablea.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- [OZB2005] Galaxy name (EIS JHHMM-DDMM NN)
19- 20 I2 h RAh Right ascension (J2000)
22- 23 I2 min RAm Right ascension (J2000)
25- 30 F6.3 s RAs Right ascension (J2000)
32 A1 --- DE- Declination sign (J2000)
33- 34 I2 deg DEd Declination (J2000)
36- 37 I2 arcmin DEm Declination (J2000)
39- 43 F5.2 arcsec DEs Declination (J2000)
45- 49 F5.2 mag Icmag Cousins I magnitude
51- 56 F6.4 --- z ?=8.8888 Redshift
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History:
From electronic version of the journal
08-Dec-2006: The first 71 objects of tablea where associated to
EISJ0048-2942 intead of EISJ0046-2951. It is now corrected.
(End) Patricia Vannier [CDS] 10-Aug-2006