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1、**FULLTITLE**ASPConferenceSeries,Vol.**VOLUME**,**YEAROFPUBLICATION****NAMESOFEDITORS**Theevolutionofthecolour-magnituderelationandofthestarformationactivityingalaxyclusterssincez∼0.8GabriellaDeLuciaMaxPlanckInstitutf¨urAstrophysik,Postfach1317,D-85748Ga
2、rchingbeiM¨unchen,GermanyBiancaM.PoggiantiINAF-OsservatorioAstronomicodiPadova,I-35122,ItalyAbstract.Wepresentrecentresultsontheevolutionofthecolour-magnituderelationandofthestarformationactivityingalaxyclusterssincez∼0.8.ResultsarebasedontheESODistantCl
3、usterSurvey(EDisCS)-anESOlargeprogrammeaimedatthestudyofclusterstructureandclustergalaxyevolutionoverasignificantfractionofcosmictime-andarediscussedintheframeworkofthecurrentstandardparadigmofstructureformation.1.IntroductionGalaxyclustersarecommonlycons
4、ideredasgoodlaboratoriesforstudyingthephysicalprocessesthatdrivegalaxyevolution.Thisforemostroleisprimarilyduetothepracticaladvantageofhavingmanygalaxies(allapproximatelyatthesameredshift)inarelativelysmallregionofthesky,sothatefficientob-servationscanbeca
5、rriedoutevenwithmodestfieldsofview,andwithlimitedamountsoftelescopetime.Withinourcurrentstandardparadigmforstructureformation,galaxyclustersrepresent,however,biasedenvironmentsoriginatingfromthehighest(andrarest)peaksintheprimordialdensityfield,whoseevo-lu
6、tionappearstobemorerapidandperhapsmoreviolentthaninregionsoftheUniversewithaveragedensity(seediscussioninDeLucia2007).Theinstrumentalcapabilitiesachievedinrecentyears,andthecompletionarXiv:0804.1743v1[astro-ph]10Apr2008ofmodernlargephotometricandspectros
7、copicsurveyshaveprovidedarapidlygrowingdatabaseofhigh–redshiftclusters,andwidenedthemassrangeoftheexaminedsystems.Itisnowbecomingevidentthatthephysicalpropertiesofclustergalaxiesdependnotonlyonredshiftbutalsoonclustermass,andthatthisdependencyneedstobeta
8、kenintoaccountforacorrectinterpretationofobservationaldataintermsofevolution.Inthisframework,theEDisCSclustersamplerepresentsanidealdataset.EDisCSprovideshomogeneousphotometryandspectroscopyfor20fieldscontaininggalaxycluste
