A wide-field spectroscopic survey of the cluster of galaxies Cl0024+1654 ^*,**

I. The catalogue

¹ Observatoire Midi-Pyrénées, UMR5572, 14 Av. Édouard Belin, 31400 Toulouse, France
² Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK
³ Institut d'Astrophysique de Paris, 98bis Bd. Arago, 75014 Paris, France
⁴ Observatoire de Paris, DEMIRM, 61 Av. de l'Observatoire, 75014 Paris, France
⁵ CFHT Corporation, PO Box 1597, Kamuela, Hawaii 96743, USA

Corresponding author: O. Czoske, oczoske@ast.obs-mip.fr

Received: 26 January 2001
Accepted: 9 March 2001

Abstract

We present the catalogue of a wide-field CFHT/WHT spectroscopic survey of the lensing cluster Cl0024+1654 at . This catalogue contains 618 new spectra, of which 581 have identified redshifts. Adding redshifts available from the literature, the final catalogue contains data for 687 objects with redshifts identified for 650 of them. 295 galaxies have redshifts in the range , i.e. are cluster members or lie in the immediate neighbourhood of the cluster. The area covered by the survey is in size, corresponding to at the cluster redshift. The survey is 45% complete down to over the whole field covered; within 3 arcmin of the cluster centre the completeness exceeds 80% at the same magnitude. A detailed completeness analysis is presented. The catalogue gives astrometric position, redshift, V magnitude and colour, as well as the equivalent widths for a number of lines. Apart from the cluster Cl0024+1654 itself, three other structures are identified in redshift space: a group of galaxies at , just in front of Cl0024+1654 and probably interacting with it, a close pair of groups of galaxies at and an overdensity of galaxies at with no obvious centre. The spectroscopic catalogue will be used to trace the three-dimensional structure of the cluster Cl0024+1654 as well as study the physical properties of the galaxies in the cluster and in its environment.