博士论文答辩-inside and around galaxies

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1、WeipengLin(ThePartnerGroupofMPA,SHAO)CollaboratorsGerhardBörner(MPA)HoujunMo(UMASS&MPA)QuasarAbsorptionlinesystems:InsideandaroundgalaxiesIAUC199:ProbingGalaxiesThroughQuasarAbsorptionLinesShanghaiObservatory,14-18/03/20058/4/20211OverviewWhyandWhattodo?Arethelow-redshiftquasarabsorptionli

2、nesystemsarisingfromgalactichalos?Whichpartofgalaxygivesrisetoabs.lines?Whatisthenatureofabsorber-galaxyconnection?Ourworks:Models&Monte-CarlosimulationsSummary8/4/20212AbsorbinggasesinsideandaroundgalaxiesGalacticdarkmatterhaloescontainlotsofmulti-phasegasessomeofwhicharecoldanddarkandcan

3、onlybeprobedthroughquasarabsorptionlines.Withoutknowingthegasprocedures(suchasshockheating,cooling,collision,tidalstripping,evaporation,super-wind,etc.)insidegalactichalo,onecanNOTcompletelyunderstandgalaxyformation.Therefore,thestudiesofquasarabsorptionlineshaveusefulconstraintsontheories

4、ofgalaxyformation:gasandstarformationprocedures,enrichmenthistory,feedback,etc.overview8/4/20213OriginofQSOAbs.LinesystemsAthighredshift(z>1)Lyman-forest:IntergalacticMediumLymanLimitsystems:Mini-Halo?DampedLymansystems:galaxydisks?Metalabs.linesystems:Galactichaloes?IGM?overview8/4/202

5、14OriginofQSOAbs.LinesystemsAtlowredshift(z<1)StrongLymanabs.linesystems(W>0.3Å):byIGMorgalaxies？★Strongmetalabs.linesystems：bygalaxiesorothersources?★Weakmetalabs.linesystems:byIGM？Galaxies？Winds?Othersources?overview8/4/20215Debateontheoriginoflow-redshiftabs.linesystemsWhichabsorbingc

6、omponentsaremoreimportant,IGM?galaxies?orboth?Cloudproperties:cold,warm,hotIsthereananti-correlationbetweenequivalentlinewidthandprojecteddistancefromgalaxycentertoLOS？Howstrongisit?(variousauthors,variousLOS,differentresults)overview8/4/20216Debateontheoriginoflow-redshiftabs.linesystems

7、Andisthereenvironmentaleffectonthequasarabs.linesystems?Forexample,galaxygroups,clustersofgalaxies,oronthecontraryvoids?overview8/4/20217overviewN(z)∝N0(1+z)Resultsofspectroscopicobservations≈0.48≈1.7-2.78/4/20218ImagingsurveysoftheabsorbersHowtolocatethega