AGNsciencewithSPHEREx,andSynergywithSubaru
MinjinKim(KyungpookNationalUniversity)Woong-SeobJeong,YujinYang(KASI),KASISPHERExteam
Outline
• SPHERExspacemission
• ReverberationMappingprojectwith
SPHEREx(inconjunctionwithHSC)
OverviewofSPHEREx• Spectro-PHotometerfortheExtragalacticstructure,
ReionizationandicesExplorer
• MIDEXmissioninPhaseA(Finalselectionwillbemadesoon)
• Thefirstall-skyoptical/NIRspectralsurvey
• Widespectralcoverage:0.75-5um,R~40/150
• LedbyJPL(PI:JamieBock):7USinstitutes+KASI
• Scienceoperation:2022-2024(2yrsofsurvey)
Howitworks?LinearVariableFilter(LVF)
PlutofromNewHorizons
11deg
3.5deg
Wavelength
Band 1
λ = 0.75 – 1.11 µm λ/Δλ = 41
t1t2
t16
Band 2
λ = 1.11 – 1.64 µm λ/Δλ = 41
t17t18
t32
Band 3
λ = 1.64 – 2.42 µm λ/Δλ = 41
t33t34
t48
Band 6
λ = 4.45 – 5.01 µm λ/Δλ = 135
t33t34
t48
Band 4
λ = 2.42 – 3.68 µm λ/Δλ = 38
t1t2
t16
Band 5
λ = 3.68 – 4.45 µm λ/Δλ = 85
t17t18
t32
5 µm H2RG Arrays in Transmission
2.5 µm H2RG Arrays in Reflection
Howitworks?• 32✕3scanimages→fullspectrum(Imagingspectroscopy)
• Accurateredshiftmeasurements(with1.6umbump)
SurveystrategyAll-Sky Coverage for 2 years
Deep Surveys at Poles (~2x100deg2)
wholeskyin6months
surveybaselineis2yrs(2023-2024)
SurveyDepth•~19-20magforAll-Sky ~22magforDeep(Polarregion)
MainScienceTopics1.TheOriginoftheUniverse(largescalestructure)
2.TheOriginandHistoryofGalaxies(cosmicSFhistory)
3.TheOriginofWater(Ices)inPlanetarySystems
AGNsciencewithSPHEREx• CentralstructureofAGNs
-Optical/IRreverberationmapping
• AGNunification -DemographyofType2Quasars
• BH-hostcoevolution -SFRinAGNs
• Andmuchmore!!!(Synergieswithothersurveys;e.g.,
eRosita,LSST,EUCLID,WFIRSTetc.)
Optical/IRreverberationmapping
UV,opticalcontinuum
Broademissionline
IRcontinuumCourtesy:ClaudiaRicci
TimelagsamongUV(optical),broadlines,IR ->sizeofBLRandTORUS
RBLR Rtorus
Optical/IRreverberationmappingTimelagsamongUV(optical),broadlines,IR
->sizeofBLRandTORUS
Koshidaetal.2014
Torusreverberationmapping
Duetal.2018
BLRreverberationmapping
UniquenessofSPHEREx
i=17magz=0.3
OriginalspectrafromShangetal.2011
i=17magz=1.2
Simultaneousvariabilitymeasurementof (1)broademissionlines(H𝜶orPa𝜶) (2)IR/optcontinuum+IRcolor
Hαolux NIR
Hβ,Hαolux
opt.
NIR
mag(i)=17.0 redshift=0.3
1 2 3 4 5wavelength (um)
17.5
17.0
16.5
16.0
15.5
15.0
14.5
AB
mag
mag(i)=17.0 redshift=1.2
1 2 3 4 5wavelength (um)
17.5
17.0
16.5
16.0
15.5
15.0
AB
mag
• Requirementsforreverberationmapping
(1)multi-epochdata(variability)-datafromeachvisit
(2)relativelyhighS/Ndata
(3)missingdataset: LackofUV/opticalphotometryand(highR)spectroscopic
data
Poles>100epochs
-> Poles!
Optical/IRreverberationmapping
• BrightAGNshaverelativelylargertimelagscomparedtosurveybaseline(2yrs)
119 days
11.9 days
Koshidaetal.2014
mostluminous
lessluminous Giveon+1999
BLR
Torus
2yrsofbaselineistooshort?
1 yr
• Torecoverlargetimelags(>yrs)
• Synergywithground-basedtelescopessuchasSubaru. -WideFieldofView(HSC) -Optimaltoobtaindeepphotometricdata.(PFSisalsoidealtogetadditionalopticalspectroscopicdata.)
Pre-photometricopticaldata!
2020 2021 2022 2023 2024
HSC (opt)
SPHEREx (IR)
• ComplimentarytoSPHERExdeepregion(100deg2)
• Multi-epochobservationswith2weeks-1monthcadence:
~starting1-2yrbeforeSPHERExlaunching
• Foreachvisit,~1hrcanbeusedtocovertheentirefieldfora
singlefilter(gorr)->Intotal,36-100hrsfor3-4yrs(or6-12hrs/semester)
dependingonthesurveydesign.
• Intheend,wewillgetdeepopticaldataasaby-product
(usefultostudyhigh-zgalaxiesandobscuredAGNs).
HSCsurveyofNorthEclipticPole
Summary• SPHERExwillconductthefirstallskyspectralsurvey
withspectralcoverageof0.75-5um.• InconjunctionwithHSCsurveyofNEP,SPHERExwill
provideuniquedatasetforOpt/IRRMexperiments.• Thefinalselectionwillbemadesoon.Staytuned!
Thankyou!