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ConferenceSummary
TheCo-EvolutionofGalaxiesandTheirCentralRegionsSandyFaber
November9,2018
Contents
• Sandy’scandidatesforReallyBigIdeas• Sandy’scandidatesforSmallerBigIdeas• Desiderata• Challenges/UnansweredQuestions/Controversies
ReallyBigIdeas
• Morphologicalstructuresatgalaxycentersmaymodulateinwardgasflows(andbuildbulgesandBHs?).Some<1kpc.Howdotheseevolveovertime?HowdotheyrelatetoglobalReffandM*?– MassprofilesM*(r)>>rotationcurves>>stallpoints– Usedustlanestomeasureinwardflowrates?– Star-formationovertimemaymodifymassdistributions,flows– Barsseemsimple.Whataboutnon-bars?– Howdocentralfeaturesscalewithglobalproperties:,Reff,M*
• Eventsatgalaxycentersmaybecyclical.Candatabephasedtorevealthecycle?E.g.,ring,SFR,dust,AGN,BPT.– ManydataindicatepastactivityatGalacticCenterafewmillionyrago:X-ray,FermiBubble,part-filledring.Consistentwitharingeventnowre-forming?– Cansamepatternsbeseeninothergalaxies?
• Star-forminggalaxiesaredefinedbybothReffandM*.
NGC1512 NGC3368 NGC1433
NGC1097 NGC3081 NGC4736
SmallerBigIdeas• MagneticfieldsmaymodulategasmotionsinGalacticCenterQSOproperties:
- EtavariesenormouslywithBHaccretionrate.Rememberthis!- Spectraare2-Dfamily.Oneismetallicity.- MetallicityofQSOsis4-5Z¤.ImpliesstronglocalSF.ESF~EBH?- FermiBubblescouldbelong-lived,ubiquitousandplayaroleinquenching.
• Allpropertiesoflocalgalaxiesvarysmoothlythroughthegreenvalley,consistentwithasteadyevolutionaryflow.- S0shavesameHIgasasspirals.Howisthis?- E’sdon’t,yethaveLyα.Howisthis?- S0squenchbecausetheylosetheirH2.Howhappen?
• BothmajorandminormergersareneededtocreateE’s.• Confirmingevidencethatmajormergerstriggerthebrightest
QSOsandSFrates.• MoremassiveE’sarehardertocleanoutbutAGNscandoit.
Desiderata
• Catalogsoflocalgalaxies:massprofiles,SFprofiles,morphologies,gasmaps(bothHIandH2).– Catalogofrings:https://en.wikipedia.org/wiki/AINUR
• ReliablecatalogsofE’sandS0’satallredshifts.• Measurementsusingallthenewtools:
– Manynewtoolsarecoming:ALMA,GRAVITY,C+,Neratios
Challenges/UnansweredQuestions/Controversies• HowdoweconvertalltheseminutiaeintolawslikeM~σ4?• Whereisthe“valve”thatregulatesmassflowontothecircum-
nucleardisk?Isitglobalproperties:bar,Reff,M*?Orisitlocal:i.e.,structureoftheBHregion?
• HowdoBHsgrowinsmallbulges?suppressedbySNae?wandering?lackofdifferentialrotation?lackofbars?- WhyistheBHintheMilkyWaysosmall?WhyistheBHinM31sobig?Is
thereinnerstructure/propertiesnotcapturedbyΣ1?• DoAGNsplayaroleinquenchingspirals?
- Ifnot,thenwhyarebulgesred?• Canjetsprovidefeedback?• HowwasourFermiBubbleinflated?BySFactivity?ByAGN?
ProjectIdeas• StellarmassmapsoflocalspiralsfromHST.Correlatewithmorphological
features.(Longmore)• MassinflowratesfrmALMAvelocitymaps(Longmore)• LookforinflowinggasinMWinside100pc.(Longmore)• Usespiralpatternsinsideringstocalculateinflowrates.(Faber)• HowlongwillittakecurrentSFRinMWringtochangerotationcurve?How
longinothergalaxies?(Longmore)• PredictFermiBubblesindifferentgalaxiesassumingdifferentenergyinput
sourcesandsimplescalinglaws.Howtodetect?(Faber).• AretheremissingdwarfsintheComaCluster(Kormendy)?• DoSersicindicesofEenvelopescorrelatewithenvironment?(Faber)• DevelopabetterwaytoclassifyS0saccuratelyinquantity.(Faber)• LookforcyclesinBPTAGNsthatcorrelatewithΣ1,ringstate,etc.(Faber)• ArePSB(fast-trackquenching)morecommonatlowermassesinGV(Faber)?• Whatisthequenchingmechanismforgalaxiestodaynear1010M¤?(Faber)• UsetheAGNlumfunctionbackinthepasttotestwhetherBHgrowthis
“kinked”.(Faucher-Giguere)