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Astron. Astrophys. 345, 363-368 (1999)


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ESO imaging survey

V. Cluster search using color data

L.F. Olsen 1,2, M. Scodeggio 1, L. da Costa 1, R. Slijkhuis 1,3, C. Benoist 1,4, E. Bertin 1,3,5, E. Deul 1,3, T. Erben 1,6, M.D. Guarnieri 1,7, R. Hook 8, M. Nonino 1,9, I. Prandoni 1,10, A. Wicenec 1 and S. Zaggia 1,11

1 European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
2 Astronomisk Observatorium, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark
3 Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands
4 DAEC, Observatoire de Paris-Meudon, 5 Pl. J. Janssen, F-92195 Meudon Cedex, France
5 Institut d'Astrophysique de Paris, 98bis Bd Arago, F-75014 Paris, France
6 Max-Planck-Institut für Astrophysik, Postfach 1523, D-85748 Garching bei München, Germany
7 Osservatorio Astronomico di Pino Torinese, Strada Osservatorio 20, I-10025 Torino, Italy
8 Space Telescope - European Coordinating Facility, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
9 Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-31144 Trieste, Italy
10 Istituto di Radioastronomia del CNR, Via Gobetti 101, I-40129 Bologna, Italy
11 Osservatorio Astronomico di Capodimonte, Via Moiariello 15, I-80131 Napoli, Italy

Received 16 December 1998 / Accepted 1 March 1999

Abstract

This paper presents 19 candidate clusters detected using the galaxy catalog extracted from the I-band images taken for the ESO Imaging Survey (EIS). The candidates are found over a region of 1.1 square degrees, located near the South Galactic Pole (EIS Patch B). Combined with the sample reported earlier, the number of candidates in the Southern Galactic Cap is now 54 over a total area of [FORMULA] 3.6 square degrees. V-band images are also available over 2.9 square degrees, and galaxy catalogs extracted from them over a uniform area of 2 square degrees have been used to further explore the reality of the cluster candidates detected in I-band. Nearly all the candidates detected in I-band with estimated redshifts [FORMULA] are also identified in V. At higher redshifts, only rich candidates are detected in both bands.

Key words: galaxies: clusters: general – cosmology: large-scale structure of Universe – cosmology: observations

Send offprint requests to: L.F. Olsen

© European Southern Observatory (ESO) 1999

Online publication: April 19, 1999

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