disentangling complex massive star forming region
TRANSCRIPT
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DisentanglingComplexMassiveStarFormingRegion
Tien-HaoHsieh(ASIAA)
Collaboration:MichihiroTakami(ASIAA)MitsuhikoHonda(KurumeUniversity)HiranoNoami(ASIAA)Sheng-YuanLiu(ASIAA)Yu-NungSu(ASIAA)YoshikoOkamoto(IbarakiUniversity)
Collaborationwelcome!
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Low-massstarformation
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Questionstohigh-massstarformation
• Howthematerialinfallsfromenvelope?– Problem:MBE=1.18Cthermal
3/(G3ρ)0.5
– Solution:CompetitiveaccretionorCoreaccretion?
• Howmassaccretesontothestar?– Accretionstopsat16Msun
– candiskaccretionsolveit?
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Turbulentcoreaccretionvs.Competitiveaccretion
Credit:J.Tan,N.Wright
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Challengesinstudyingmassivestarformation
Highlyobscured(Av∽100-1000)
Needlongerwavelengthmid-infraredtosubmm!
Largedistance(d≳2kpc)Crowded(104starsperpc3)
Needhighspatialresolutionobservation!
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Infrareddiagnose-COMICSimaging
Howthemassiveprotostarsareclustered?
deWitetal.(2018)
COMICS24.6um
COMICS:high-resolution7.8,9.7,12.4,and24.6umimages
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Infrareddiagnose-COMICSimaging
Howthemassiveprotostarsareclustered?
COMICS24.6um
COMICS:high-resolution7.8,9.7,12.4,and24.6umimages
DerivedAvmapfromsilicateabsorption!->dereddenedSEDs
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SpectraltypeoftheHMprotostar(s)
Okamotoetal.(2003)
�PAH7.7,8.6,11.2,and12.7um~6eV[NeII]12.8um>22eV[ArIII]8.99um>28eV[SIV]10.51um>35eV
COMICSimagingorspectroscopy->DisentanglingthecompositionsofHMprotostars!
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COovertoneemission
innerdisktracer?
Ileeetal.2013,2018
IRCSspectroscopy-DiskAccretion?
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Bγasanaccretiontracer?
Butcouldalsofromoutflows!
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Summary • Massivestarformationispoorlyunderstood!– Massinfall:competitiveaccretionorturbulentcore
• Infrareddiagnose:– COMICSimaging/spectroscopy
• Resolvetheclustermembers• ObtaintheforegroundAvmaps• IdentifyspectraltypesfromPAH,[NeII],[ArIII]and,[SIV]emission
– IRCSspectroscopy• CO(2—0)and(3—1)tracinghotgasfrominnerdisk• Brasaccretiontracer?
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ThestellarpropertiesoftheHMprotostar
COMICSimagingorspectroscopy• Comparethespectraltypeswiththeagesofclustermemberslow-massstarorhigh-massstarformearlier?->CompetitiveaccretionorCoreaccretion
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DiskAccretion?
IRTFsurveyCOisdetectedinonesourceoutof11 W33A-MM1
Ileeetal.2018
Withtheevolutionaryindicators,canwefindwhentheaccretionishalted?
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DiskAccretion?
IRTFsurveyCOisdetectedinonesourceoutof11 W33A-MM1
Ileeetal.2018
Withtheevolutionaryindicators,canwefindwhentheaccretionishalted?
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Diskaccretiontotheradiationpressureproblem
Krumholz+2009
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Diskaccretiontotheradiationpressureproblem
�Sànchez-Mongeetal.(2013)