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Transcript
Supressionofstarforma/onintransi/oning CompactGroupgalaxies U.Lisenfeld(1),K.Alatalo(2),C.Zucker(3),P.Appleton(4),S.Gallagher(5),K.Johnson(6) Thebasicques/on: Whatcausesgalaxiestotransi/onfromac/velystar-formingtoquiescent? IRcolors Op/calcolors earlytypes ? Greenvalley IRtransi/onzone (IRTZ) Latetypes GalaxysampleselectedfromGalaxyZoo(Alatalo+15). Galaxytransi/oninCompactGroups • GalaxiesinCompactGroupsare interes/ngsystemstostudy galaxytransforma/onbecause interac/onsbetweengalaxiesand withtheintragroupmediumare frequent. • Agap/canyonwasfoundintheir SpitzerIRcolorsbetweenac/ve andquiescentgalaxies,indica/ng afasttransi/onbetweenboth phases(Johnson+07,Walker+10).A similarcanyoncanbedefinedwith WISEdataforalargesample(652 galaxiesin163CGs,Zucker+16). Ac/velySFgalaxies Quiescientgalaxies Canyon Classifica/onofCompactGroupGalaxies basedonIRcolorsfromWISE(Zucker+2016). Galaxytransi/oninCompactGroups WeusethisWISEsampletocompare the • Moleculargasmass(fromCOfrom Ac/velySFgalaxies theliterature) • Starforma/onrate(SFR,from WISE22μm) • Stellarmass(M*,fromWISE3.4 and4.6μm) betweenac/ve,quiescientand transi/oninggalaxies. Canyon Quiescientgalaxies èAretheredifferencesinthe • moleculargasfrac.on(Mmol/M*)and • thestarforma.onefficieny(SFE=SFR/Mmol) betweentransi/oning,ac/veandquiescent galaxies? Classifica/onofCompactGroupGalaxies basedonIRcolorsfromWISE(Zucker+2016). =log(SFR/Mmol) Moleculargasfrac/onandSFEincanyongalaxies Line:Fittospirals(Bigiel+11) Class <Mmol/Mstar> (all) <Mmol/Mstar> (late-types) Class <SFE> (all) <SFE> (late-types) Ac/ve -0.61±0.07 -0.63±0.07 Ac/ve -9.08±0.07 -9.18±0.07 Canyon -0.92±0.08 -0.96±0.08 Canyon -9.89±0.4 Quiescent -1.96±0.10 -1.45±0.05 Quiescent -9.67±0.07 -10.00±0.08 -9.87±0.04 =log(SFR/Mmol) Moleculargasfrac/onandSFEincanyongalaxies Line:Fittospirals(Bigiel+11) èThetransi/onfromac/vetoquiescentseemstogoesalongwith (i) alossofmoleculargasfromgalaxiesand (ii) theremainingmoleculargasformsstarslessefficiently Moleculargasfrac/onandSFEinIRTZgalaxies Line:Fittospirals(Bigiel+11) Class <Mmol/Mstar> (all) <Mmol/Mstar> (late-types) Ac/ve -0.61±0.07 -0.63±0.07 IRTZ -1.50±0.14 -1.06±0.14 Quiescent -1.96±0.10 -1.45±0.05 Class <SFE> (all) <SFE> (late-types) Ac/ve -9.08±0.07 -9.18±0.07 IRTZ -9.62±0.08 -9.80±0.00 Quiescent -9.67±0.07 -10.00±0.08 Moleculargasfrac/onandSFEingreenvalleygalaxies Class <Mmol/Mstar> (all) <Mmol/Mstar> (late-types) Ac/ve -0.61±0.07 -0.63±0.07 GreenValley -0.71±0.15 -0.74±0.17 Quiescent -1.96±0.10 -1.45±0.05 Class <SFE> (all) <SFE> (late-types) Ac/ve -9.08±0.07 -9.18±0.07 GreenValley -9.18±0.122 -9.25±0.12 Quiescent -9.67±0.07 -10.00±0.08 Conclusiones WefoundthatIRtransi/oninggalaxiesshow alackofmoleculargasandalessefficientstar forma/oncomparedtoac/vegalaxies. Apossiblescenario: • Tidalinterac/onmightremovemolecular gas(asseendrama/callyintheHI) • Collisionswithneighboringgalaxiesor collisionwithIGMcanperturbthe moleculargasandmakestarforma/on lessefficient. • Turbulentenergyinjec.onmightplayan importantrole.
