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Astron. Astrophys. 345, 681-690 (1999)

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ESO imaging survey

II. Searching for distant clusters of galaxies

L.F. Olsen 1,2, M. Scodeggio 1, L. daCosta 1, C. Benoist 1,3, E. Bertin 1,4,5, E. Deul 1,4, T. Erben 1,6, M.D. Guarnieri 1,7, R. Hook 8, M. Nonino 1,9, I. Prandoni 1,10, R. Slijkhuis 1,4, A. Wicenec 1 and R. Wichmann 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 DAEC, Observatoire de Paris-Meudon, 5 Pl. J. Janssen, F-92195 Meudon Cedex, France
4 Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands
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 Landensternwarte Heidelberg-Königstuhl, D-69117 Heidelberg, Germany

Received 1 April 1998 / Accepted 21 December 1999


This paper presents preliminary results of a search for distant clusters of galaxies using the recently released I-band data obtained by the ESO Imaging Survey (EIS), covering about 3 square degrees. A matched filter algorithm is applied to the galaxy catalogs extracted from the two sets of frames that contiguously cover the whole surveyed area. From these catalogs two independent lists of cluster candidates are generated and used to establish, directly from the data, a robust detection threshold. In preparing the list of candidate clusters the main concern has been to avoid the inclusion of spurious detections. A preliminary catalog of 35 distant cluster candidates is presented, with estimated redshifts [FORMULA] over an area of 2.5 square degrees, after excluding regions where the quality of the available data is poor.

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

Send offprint requests to: L.F. Olsen

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© European Southern Observatory (ESO) 1999

Online publication: April 28, 1999