“Supplements to “A Critical Supermassive Black HoleMass Regulating Galaxy Evolution”临界超大质量黑洞”地补充 质量调节星系演化.pdf

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1、Supplementsto“ACriticalSupermassiveBlackHoleMassRegulatingGalaxyEvolution”1GalaxyFormationModellingThemainstrategybehindthemodellingapproachwefollowistofirstcalculatethecollapseandmerginghistoryofindividualdarkmatterhalos,whichisgovernedpurelybygravitationalinterac-tions,

2、andsecondlytocalculatethemorecomplexphysicsofthebaryonsinsidethesedarkmatterhalos,includinge.g.radiativecoolingofthegas,starformationandfeedbackfromsupernovaebysimplifiedprescriptionsontopofthedarkmatterevolution.Eachofthedarkmatterhalosconsistofthreemaincomponentswhichar

3、edistributedamongindividualgalaxiesinsidethem.Astel-lar,coldandhotgascomponent,wherethelatterisonlyattributedtocentralgalaxies,themostmassivegalaxiesinsideindividualhalos.Inthefollowingsections,wewilldescribebrieflytherecipesusedtocalculatethesedifferentcomponentswhichare

4、mainlybasedonrecipespresentedinKauffmannetal.1(hereafter,K99)andSpringeletal.2(hereafter,S01),andwereferreadersformoredetailsonmodelimplementationstotheirworkandreferencestherein.Throughoutthispaperweusethefollowingsetofcosmologicalparameters:Ω0=0.3,ΩΛ=0.7,Ωb/Ω0=0.15,σ8=

5、0.9andh=0.65.DarkMatterEvolutionWecalculatethemerginghistoryofdarkmatterhalosaccordingtotheprescriptionpresentedinSomervilleetal.3.ThisapproachhasbeenshowntoproducemerginghistoriesandprogenitordistributionsinreasonableagreementwithresultfromN-bodysimulations1ofcolddarkma

6、tterstructureformationinacosmologicalcontext4.ThemerginghistoryofdarkmatterhalosisreconstructedbybreakingeachhaloupintoprogenitorsabovealimitingminimumprogenitormassMmin.Thismasscutneedstobechosencarefullyasitensuresthattherightgalaxypopulationandmerginghistoriesareprodu

7、cedwithinthemodel.ProgenitorhaloswithmassesbelowMminaredeclaredasaccretioneventsandtheirhistoriesarenotfollowedfurtherbackintime.Progenitorslabelledasaccretioneventsshouldideallynothostanysignificantgalaxiesinthemandbecomposedmainlyofprimordialhotgasattheprogenitorhalo'sv

8、irialtemperature.Toachieveagoodcompromisebetweenaccuracyandcomputationaltime,weuseM=1010M,min⊙whichensu