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Title: ObservationsofablackholeX-raybinaryindicatetheformationofamagneticallyarresteddisk(MAD) Speaker: BeiYou Abstract: Accretionofmaterialontoablackholedragsanymagneticfieldspresentinwards,increasingtheirstrength.Theorypredictsthatsufficientlystrongmagneticfieldscanhalttheaccretionflow,producingamagneticallyarresteddisk(MAD).Inthistalk,Iwillintroduceourrecentworkinwhichthemulti-wavelength lightcurves ofablackholeX-raybinarywerestudied.Thediscoveredtime-delaybetweentheradioandX-rayemissionnicelyrevealshowaMADisformedinthestellar-massBHaccretion.ThisstudyhelpsusunderstandthemagneticfieldtransferandBHaccretion. Bio: Dr.BeiYou(游贝)gothisPhDatShanghaiObservatoryin2014(Supervisor:Prof. Xinwu Cao).ThemainaspectofhisPhDstudywasthedisk-coronaaccretiontheoryinBHX-raybinaryandAGNandthemeasurementofBHspininthesesystems.Afterthat,heworkedatNicolausCopernicusAstronomicalCentre(NCAC)asapost-doctorbetween2014and2017inPoland.In2017,hejoinedthefaculty atWuhanUniversity.TheresearchinterestofDr.YouiscurrentlyconcentratingontwotopicsinBHX-raybinary:(i)studyingtheoutflow/windinBHaccretiondisk;(ii)modelingthefastvariabilityinthetimedomain,includingthecharacteristicQuasi-Periodic-Oscillation(QPO)andbroadbandnoise. Time: 14:00-15:00PM,29/May, Wednesday Venue:Room508(largeseminarroom),DepartmentofAstronomy Youcanalsoaccessthecolloquiumvia: https://www.koushare.com/homepage/329883