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Subaru Weak-Lensing Survey II: Multi-Object Spectroscopy and Cluster Masses

机译：斯巴鲁弱视调查II：多目标光谱学和团簇质量

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Wepresentthefirstresultsofamulti-objectspectroscopiccampaigntofollowupclustercandidateslocatedviaweaklensing.Ourmaingoalsaretosearchforspatialconcentrationsofgalaxiesthatareplausibleopticalcounterpartsoftheweak-lensingsignals,andtodeterminetheclusterredshiftsfromthoseofmembergalaxies.Aroundeachof36targetedclustercandidates,weobtained15a€“32galaxyredshifts.For28ofthesetargets,weconfirmedasecureclusteridentification,withmorethanfivespectroscopicgalaxieswithinavelocityof$$pm$$3000kms$$^{-1}$$.Thisincludesthreecaseswheretwoclustersatdifferentredshiftsareprojectedalongthesameline-of-sight.In6ofthe8unconfirmedtargets,wefoundmultiplesmallgalaxyconcentrationsatdifferentredshifts,eachcontainingatleastthreespectroscopicgalaxies.Theweak-lensingsignalaroundthosesystemswasthusprobablycreatedbytheprojectionofgroupsorsmallclustersalongthesameline-of-sight.Inbothoftheremainingtwotargets,asinglesmallgalaxyconcentrationwasfound.Insomecandidatesuper-clustersystems,wefoundadditionalevidenceoffilamentsconnectingthemaindensitypeaktoanadditionalnearbystructure.Forasubsampleofourmostcleanlymeasuredclusters,weinvestigatedthestatisticalrelationbetweentheirweak-lensingmass($$M_{ mNFW}$$,$$sigma_{ mSIS}$$)andthevelocitydispersionoftheirmembergalaxies($$sigma_{v}$$),comparingoursamplewithopticallyandX-rayselectedsamplesfromtheliterature.Ourlensing-selectedclustersareconsistentwith$$sigma_v$$$$=$$$$sigma_{ mSIS}$$,withasimilarscattertothatofopticallyandX-rayselectedclusters.Wealsoderivedanempiricalrelationbetweentheclustermassandthegalaxyvelocitydispersion,$$M_{200}E$$($$z$$)$$=$$11.0$$ imes$$10$$^{14}$$$$ imes$$($$sigma_v/$$1000kms$$^{-1}$$)$$^{3.0}h^{-1}M_odot$$,whichisinreasonableagreementwithpredictionsof$$N$$-bodysimulationsinthe$$Lambda$$CDMcosmology.
机译：Wepresentthefirstresultsofamulti-objectspectroscopiccampaigntofollowupclustercandidateslocatedviaweaklensing.Ourmaingoalsaretosearchforspatialconcentrationsofgalaxiesthatareplausibleopticalcounterpartsoftheweak-lensingsignals，andtodeterminetheclusterredshiftsfromthoseofmembergalaxies.Aroundeachof36targetedclustercandidates，weobtained15a€“32galaxyredshifts.For28ofthesetargets，weconfirmedasecureclusteridentification，$$下午withmorethanfivespectroscopicgalaxieswithinavelocityof $$ 3000kms $$ ^ { - 1} $$ Thisincludesthreecaseswheretwoclustersatdifferentredshiftsareprojectedalongthesameline-的-sight.In6ofthe8unconfirmedtargets，wefoundmultiplesmallgalaxyconcentrationsatdifferentredshifts，eachcontainingatleastthreespectroscopicgalaxies。这些系统周围的弱镜头信号可能是由同一视线的小组或小型集群的投影所产生的。在Bothof内，剩下的两个目标只有一个小的银河系浓度。在一些候选超级集群系统中，我们发现了另外的证据证据。 ectingthemaindensitypeaktoanadditionalnearbystructure.Forasubsampleofourmostcleanlymeasuredclusters，weinvestigatedthestatisticalrelationbetweentheirweak-lensingmass（$$ M_ {mNFW} $$，$$ sigma_ {MSIS} $$）andthevelocitydispersionoftheirmembergalaxies（$$ sigma_ {V} $$），comparingoursamplewithopticallyandX-rayselectedsamplesfromtheliterature.Ourlensing-selectedclustersareconsistentwith $$ sigma_v $$ $$ = $$$$ sigma_ {mSIS} $$，其散射与光学集群和X射线选择的集群相似。我们还得出了clustermass和星系速度色散之间的经验关系，$$ M_ {200} E $$（$$ z $$）$$ = $$ 11.0 $$ imes $$ 10 $ 14} $$$$ imes $$（$$ sigma_v / $$ 1000kms $$ {{-1} $$）$$ ^ {3.0} h ^ {-1} M_odot $$，这是具有$$ N $$-预测的合理协议$ Lambda $ CDM宇宙学中的人体模拟。

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