GaBoDS: The Garching-Bonn Deep Survey

Free access article

Issue		A&A Volume 420, Number 1, June II 2004


Page(s)		75 - 78
Section		Cosmology (including clusters of galaxies)
DOI		http://dx.doi.org/10.1051/0004-6361:20041072

A&A 420, 75-78 (2004)
DOI: 10.1051/0004-6361:20041072

II. Confirmation of EIS cluster candidates by weak gravitational lensing

M. Schirmer¹, T. Erben¹, P. Schneider¹, C. Wolf² and K. Meisenheimer³

¹ Institut für Astrophysik und Extraterrestrische Forschung (IAEF), Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
² Department of Physics, Denys Wilkinson Bldg., University of Oxford, Keble Road, Oxford, UK
³ Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany

(Received 21 January 2004 / Accepted 8 March 2004 )

Abstract
We report the first confirmation of colour-selected galaxy cluster candidates by means of weak gravitational lensing. Significant lensing signals were identified in the course of the shear-selection programme of dark matter haloes in the Garching-Bonn Deep Survey, which currently covers 20 square degrees of deep, high-quality imaging data on the southern sky. The detection was made in a field that was previously covered by the ESO Imaging Survey (EIS) in 1997. A highly significant shear-selected mass-concentration perfectly coincides with the richest EIS cluster candidate at $z\approx0.2$ , thus confirming its cluster nature. Several other shear patterns in the field can also be identified with cluster candidates, one of which could possibly be part of a filament at $z\approx0.45$ .

Key words: cosmology: dark matter -- galaxies: clusters: general -- cosmology: gravitational lensing

Offprint request: M. Schirmer, mischa@astro.uni-bonn.de

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