A wide-field spectroscopic survey of the cluster of galaxies(4)

We present the catalogue of a wide-field CFHT/WHT spectroscopic survey of the lensing cluster Cl0024+1654 at z=0.395. This catalogue contains 618 new spectra, of which 581 have identified redshifts. Adding redshifts available from the literature, the final

4O.Czoskeetal.:SpectroscopicsurveyofCl0024:I.The

catalogue

Fig.1.22′×25′sectionoftheCFH12kV-bandimageshowingthedistributionoftheobjectsinourspectroscopicsample.ExpandedviewsofthemarkedregionsareshowninFigs.4a–4hasindicatedintheimage.Thecoordinatesgivenarerightascensionanddeclinationrelativetoα2000=00h26m35s.70,δ2000=17 09′43′′.06.alargerrangeofwavelengthsprovidemoresecurered-shiftdeterminationssincemoreabsorptionandemissionlinescanbetakenintoaccount.Thisisparticularlyim-portantinthepresenceofartifactscausedbyinsu cientremovalofcosmicrayhits.InthecaseofCl0024+1654at

breakroughlycoincideswiththez=0.395,the4000A

strongskyemissionline[Oi]λ5577,sothatinsu cientsubtractionoftheskylinemightcauseaproblemintheredshiftdeterminationifonlyalimitedwavelengthbandwereavailable.Also,coveringawidewavelengthrangeis