博士论文答辩.ppt

WeipengLin(ThePartnerGroupofMPA,SHAO)CollaboratorsGerhardBörner(MPA)HoujunMo(UMASS&MPA)QuasarAbsorptionlinesystems:InsideandaroundgalaxiesIAUC199:ProbingGalaxiesThroughQuasarAbsorptionLinesShanghaiObservatory,14-18/03/2005*1OverviewWhyandWhattodo? Arethelow-redshiftquasarabsorptionlinesystemsarisingfromgalactichalos?? Whatisthenatureofabsorber-galaxyconnection?Ourworks:Models&Monte-CarlosimulationsSummaryDate2AbsorbinggasesinsideandaroundgalaxiesGalacticdarkmatterhaloescontainlotsofmulti-(suchasshockheating,cooling,collision,tidalstripping,evaporation,super-wind,etc.)insidegalactichalo,,thestudiesofquasarabsorptionlineshaveusefulconstraintsontheoriesofgalaxyformation:gasandstarformationprocedures,enrichmenthistory,feedback,(z>1)Lyman-forest:IntergalacticMediumLymanLimitsystems:Mini-Halo?DampedLymansystems:galaxydisks?:Galactichaloes?IGM?(z<1)StrongLyman(W>Å):alaxies?★:bygalaxiesorothersources?★:byIGM?Galaxies?Winds?Othersources?overviewDate5Debateontheoriginoflow-,IGM?galaxies?orboth?Cloudproperties:cold,warm,hotIsthereananti-correlationbetweenequivalentlinewidthandprojecteddistancefromgalaxycentertoLOS?Howstrongisit?(variousauthors,variousLOS,differentresults)overviewDate6Debateontheoriginoflow-?Forexample,galaxygroups,clustersofgalaxies,oronthecontraryvoids?overviewDate7overviewN(z)∝N0(1+z)Resultsofspectroscopicobservations≈≈-?Whatarethecharacteristicsoftheabsorbinggalaxi