A wide-field spectroscopic survey of the cluster of galaxies(10)

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

O.Czoskeetal.:SpectroscopicsurveyofCl0024:I.Thecatalogue

11

Fig.4d.

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Fig.4e.

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Fig.4f.

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Fig.4g.Continued

asecure0.3955.WeassumethatthisisatypographicalerrorintheDressleretal.listandadoptourvalue.Ourspectrumforobject416(D33)indicatesz=0.3895asopposedtotheir0.4035.SinceDressleretal.onlygivethisaqualitycode‘3’,weadoptourvalue.Object289(D109)issimilarlyuncertain.Object466shouldbeiden-ticaltoDressleretal.’sobjectD37,howeverthespectraarecompletelydi erentgivingsecureredshiftsof0.3916and0.1840respectively.WehavetoassumethereforethatD37haswrongcoordinates.AsimilarproblemoccursforD130(our237).

Addingthe69objectswhichwereobservedbyDressleretal.aloneincreasesthesizeofthecatalogueto687ob-jects,with650identi edredshifts.

pleteness

Fig.5presentscolour-magnitudediagrams(CMDs)forthephotometric(fortheoverlapregionoftheCFH12kandUH8kimages)andthespectroscopiccatalogues.ForthelattercataloguewealsoshowseparateCMDsforforegroundgalaxiesatz<0.37,backgroundgalaxiesatz>0.41,galaxiesattheclusterredshift(0.37<z<0.41)andforanewlyidenti edgroupofgalaxiesatz=0.495(seeSect.4).