Extragalactic science, cosmology, and Galactic archaeology with the Subaru Prime Focus Spectrograph

摘要

TheSubaruPrimeFocusSpectrograph(PFS)isamassivelymultiplexedfiber-fedopticalandnear-infraredthree-armspectrograph(Nfiber??=??2400,380??a‰¤??????a‰¤??1260??nm,1$$_{.}^{circ}$$3diameterfieldofview).Here,wesummarizethesciencecasesintermsofprovisionalplansfora300-nightSubarusurvey.Wedescribeplanstoconstrainthenatureofdarkenergyviaasurveyofemissionlinegalaxiesspanningacomovingvolumeof9.3a€‰ha?’3??Gpc3intheredshiftrange0.8????z????2.4.Ineachofsixredshiftbins,thecosmologicaldistanceswillbemeasuredto3%precisionviathebaryonicacousticoscillationscale,andredshift-spacedistortionmeasureswillconstrainstructuregrowthto6%precision.Inthenear-fieldcosmologyprogram,radialvelocitiesandchemicalabundancesofstarsintheMilkyWayandMa€‰31willbeusedtoinferthepastassemblyhistoriesofspiralgalaxiesandthestructureoftheirdarkmatterhalos.Datawillbesecuredfor106starsintheGalacticthick-disk,halo,andtidalstreamsasfaintasV??a??22,includingstarswithV????20tocomplementthegoalsoftheGaiamission.Amedium-resolutionmodewithR??=??5000tobeimplementedintheredarmwillallowthemeasurementofmultiple?±-elementabundancesandmoreprecisevelocitiesforGalacticstars.Forthegalaxyevolutionprogram,oursimulationssuggestthewidewavelengthrangeofPFSwillbepowerfulinprobingthegalaxypopulationanditsclusteringoverawideredshiftrange.Weplantoconductacolor-selectedsurveyof1????z????2galaxiesandAGNover16??deg2toJa‰?23.4,yieldingafairsampleofgalaxieswithstellarmassesabovea??1010a€‰Ma??atza‰?2.Atwo-tieredsurveyofhigherredshiftLymanbreakgalaxiesandLymanalphaemitterswillquantifythepropertiesofearlysystemsclosetothereionizationepoch.