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从WISE数据中搜寻星系团.docx

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从WISE数据中搜寻星系团 Introduction: Thestudyofgalaxyclustersisanimportantareaofastrophysicsasitprovidesinsightintotheformationandevolutionoflarge-scalestructuresintheuniverse.Galaxyclusters,asthelargestknowngravitationallyboundstructuresintheuniverse,arealsoideallaboratoriesforstudyingdarkmatter,whichisadominantcomponentofthemasswithinclusters.TheWide-fieldInfraredSurveyExplorer(WISE)missionisapowerfultoolfordiscoveringnewgalaxyclusters.Inthispaper,wewillexplorethecapabilitiesofWISEdataindetectingandcharacterizinggalaxyclusters. WISEMission: TheWide-fieldInfraredSurveyExplorer(WISE)missionwaslaunchedin2009byNASAandwasdesignedtoconductanall-skysurveyatfourwavelengths(3.4,4.6,12,and22μm).WISEcollecteddataforabout10monthsandcoveredtheentireskyinthemid-infraredregime.Thesurveyresultedinthedetectionofover560millionobjects,includinghundredsofthousandsofgalaxies. DetectingGalaxyClusterswithWISE: OneofthemainadvantagesofWISEdataisitsdeepandwidecoverageoftheinfraredsky,whichmakesithighlyeffectiveindetectinggalaxyclusters.Clustersaretypicallyidentifiedthroughtheircharacteristicsignaturesintheinfrared,whichincludesthepresenceofhotintraclustergasandgalaxieswithhighinfraredluminosities.TheWISEsurveyissensitivetothethermalemissionfromtheintraclustergas,whichisdetectedinthe12and22μmbands.Inaddition,theWISEdatacanbeusedtoidentifygalaxieswithhighinfraredluminosities,whichareindicativeofgalaxiesundergoingintensestarformation,acommonfeatureinmerginggalaxyclusters. CharacterizingGalaxyClusterswithWISE: WISEdatacanalsobeusedtocharacterizethepropertiesofgalaxyclusters.Thesurfacebrightnessoftheintraclustergasemissioninthe12and22μmbandscanbeusedtoestimatethemassofthehotgaswithinacluster,whichisaproxyforthetotalmassofthecluster.TheWISEdatacanalsobeusedtostudythedistributionofthehotgasanditsrelationshiptothedistributionofgalaxieswithinthecluster.Thisisimportantforunderstandingtheprocessesthatgoverntheformationandevolutionofclusters.Inaddition,theWISEdatacanalsobeusedtostudythepropertiesofgalaxieswit