Large Area X-ray Propor.onal Counter (LAXPC) instrument ...astrosat/jsy_ao1_laxpc.pdf · AS-LX-EL-40 PURIFIER ELECTRONICS (XPDE) AS-LX-EL-50 ... NGC 4151 with LAXPC10 3-80 keV spectrum

LargeAreaX-rayPropor.onalCounter(LAXPC)instrumentandini.alscienceresults

(frompayloadverifica.onphase)

J.S.Yadav

TataIns.tuteofFundamentalResearchMumbai,India

19-Jul-16 JSYadav,TIFR 1

19-Jul-16

ACercomple.ngallelectronic&detectortestsandfinalcalibra.on,allthreeflightunitsofLAXPCinstrumentinAITlabforintegra.onwithsatelliteon20thOctober,2014.

JSYadav,TIFR 2

LAXPCinstrument`scapabili.esaresimilarorbeSerthanthatofNASA`sRXTE/PCA.

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PayloadsInstruments:

⋟  LargeAreaX-RayProportionalCounter(LAXPC)-TIFR

⋟  Softx-rayTelescope(SXT)-TIFR

⋟  CadmiumZincTellurideImager(CZTI)–TIFR

⋟  UltraVioletImagingTelescope(UVIT)–IIA

⋟  ScanningSkyMonitor(SSM)–ISAC

SXT LAXPC

CZTISSM

UVIT

ASTROSAT: Co-aligned multi-wave instruments

J S Yadav, TIFR 419-Jul-16

Abroadenergyband(3-80keV)withhighdetec.onefficiencyofX-rayabove20keVandhigh.mingresolu.on10μsec..• Threeco-alignediden.calLAXPCdetectors

• Eachwithamul.-wire-mul.-layerconfigura.onfilledwith90%Xe+10%

Methanegasat1520torr.Energyresolu.on(12%@22keV)

• A50micronthickaluminizedMylarwindowforX-rayentrance

Mylarfilmsupport--byahoneycombwindowsupportcollimator

• Anarrowfieldofviewof.8x.8degsprovidedbymechanicalcollimatorsmade

ofasandwichof50µSn+25µCu+100µAlco-alignedwiththewindow

supportcollimatorandsiingaboveit.

• BlockingshieldonsidesandboSom:1mmSn+0.2mmCu

LAXPC: Large Area X-ray Proportional Counters (~419 Kg) (became fully operational on 19th Oct. 2015)

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LAXPCFlightPackages

LAXPC DETECTOR 1 AS-LX-DT-10

LAXPC

DETECTOR 2 AS-LX-DT-20

LAXPC

DETECTOR 3 AS-LX-DT-30

PROCESSING ELECTRONICS 1

AS-LX-EL-10

PROCESSING

ELECTRONICS 2 AS-LX-EL-20

PROCESSING

ELECTRONICS 3 AS-LX-EL-30

S. T. B. G.

AS-LX-EL-40

PURIFIER

ELECTRONICS (XPDE)

AS-LX-EL-50

Ø  LAXPCpayloadhas8flightpackages.Ø  ThreeDetectors,Ø  CorrespondingProcessingElectronics,Ø  CommonSTBGpackage,&XPDEpackage

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Detector System Brief description •  LAXPC Instrument consists of 3 identical detectors. •  Each LAXPC has the following major components : Field of View Collimator (FOVC) Window Support Collimator (WSC) Collimator Housing Anode Frames Detector Housing Back Plate

Detector hardware

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Detector hardware

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Harnesswiringofdetector

Detector Front-End Electronics

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LAXPC Detector on vibration table

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Sor.ngoutpurifica.oncartridgeissueinLAXPC30atISACon20thAugust,2014

JSYadavTIFRMumbai 1319/07/16

Calibration scan profile

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Lx10 spectra of sources at different temperatures (10°c,

20°c & 30°c)

LAXPC Calibration Meeting, Feb 2015 15

Labcalibra.on:GEANT4simula.onforLAXPC30unit&resultsforAmsource(all5layers)

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LAXPCinstrumentwillhavefour.mesormoreeffec.veareaabove20keVascomparedtoRXTE/PCA.Itcandetect0.1mcrabsourcesinfewthousandsecond.

ComparisonofLAXPCwithNASA’sRXTE/PCA

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Detectorperformance:On-boardPurifica.on&Detectorenergyresolu.on

l  On-Board Purification for Flight Detectors

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EachoftheLAXPCdetectorshasanonboardgaspurifica.onsystem.Thissystemwillbeoperatedasandwhenrequiredtopurifythegasfilledinthedetectorbycommand.Itisexpectedthatenergyresolu.onofLAXPCdetectorwilldegradeasimpurityincreases.

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CAS–A(supernovaremnant)observa.onLAXPC30(leCtop)andRXTE/PCA(leCboSom).GX301-2observa.oninearlyMay2016showsimilarResolu.on(Ironlineisclearlyvisiblear6.4keV)

Energyresolu.onat6.4keVinorbit:Weachievedaround20%Energyresolu.onasproposed.

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RXTE/PCACAS-Aobserva.on

Crabobserva.onwithLAXPCandRXTE/PCA(NASA):RXTE/PCAtook3yearstofit2-60kevwithreducedCHIsquare~3whilewehavefitLAXPCspectrumin3-80kevwithreducedCHIsquare~1.4.LAXPCdetectorHashigherefficiencyathigherenergy(RXTE/PCAhas1c/s/keVat30keVwhileLAXPChasthisfluxvalueat60keV)

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RXTE/PCA

Atpresent,NASA,sNustarandLAXPCinstrumentareonlytwoX-rayspaceinstrumentswhichcover3-80keVenergyrange.HereweshowfittosimultaneousLAXPCandNustardataofCrab(aX-raypulsar)takenon1stApril,2016.Itisagoodfitwithreducedchisquare~1.04.Nustardatashowslargespreadathighenergywhichsuggeststhatitsdetec.onefficiencydecreasesfastat>30keV.

LAXPCinstrumentcapabili.es:comparisonwithNustar

RebinnedpowerdensityspectraofGRS1915+105(amicroquasar)inSPLstate.ItmatchesWellwiththepredictedPoissonnoiselevelwithdead.me42.3microsecondsandalowFrequencypowerlowcomponent.ThegreenlineshowstheexpectedpeakpowerofaQPOWithqualityfactorQ=4andrmsof5%.LAXPCinstrumentwoulddetectQPOofsuchaStrengtheasily.ll3000Hz.

LAXPCinstrumentcapabili.es:QPO(QuasiPeriodicOscilla.on)detec.on

Observa.on6thMarch2016

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LAXPCfirstresults: Crab(apulsar):

First light results: 4U 0115+63 (a pulsar in outburst)

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TransientX-raypulsar(3.6seconds)4U0115+63.HighMassX-rayBinarywithaneutronstar(highmagne.cfield)companionthataccretesmass

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RadiojetsobservedsimultaneouslywithGMRTRadioflaresduringX-raythetaclass:5-7March2016

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6.MicroquasarGRS1915+105insteeppowerlaw(SPL)state:Contribu.onofthermalandnon-thermalprocesstototalX-rayluminosity(leCpanel)andvaria.onofquasi-periodicOscilla.on(QPOs)withX-rayluminosity(rightpanel)

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DuringGRS1915+105observa.onduring5-7thMarch,2016SPL(steeppowerlaw)X-raystatewasobservedfor~10hrs.QPOfrequencychangesfrom2.5Hzto6Hz.

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LACPCini.alresults;CygX-1(persistentblackholeX-raybinary)

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CygX-1Energyspectrum

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LAXPCobserva.onofThermonuclearburstsandhighfrequencyQuasiPeriodicOscilla.on(HFQPOs):LAXPCobservedthermonuclearburstsintwoneutronstarX-raybinaries;4U1636-536and4U1728-34duringinstrumentverifica.onphase.Thesearethermonuclear(atombomb)explosionsonaccre.ngneutronstar.Rise.meis~1sec(X-rayfluxrisesbyafactorof~10)anddecay.me10-100sec.

4U1728-34

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ToppanelshowsdynamicpowerdensitySpectrumfromLAXPCobserva.onof4U1728-34.Weobservedburstoscilla.onforfirstFoursecat362.7Hz(toppanel).ItsuggeststhatthisthermonuclearburstshappensatEquatorandspreadsinfoursecandBecomeaxisymmetricbeltandQPODisappears(boSompanel)

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HighFrequencyQuasi-periodicOscilla.ons(HFQPOs):HFQPOsproberegionsclosetothecompactobjects(NeutronstarandblackholeSystems)whicharecharacterizedbyveryhighgravityandmagne.cfield.

ISCO12.5km

27km

15km

Orbitandfrequency

Observedfrequencyisalways<1.2KHz(for~2Msun).Theinnermoststablecircularorbit(ISCO)Isaround12.5kmwhichcorrespondsto1.2KHz(rightpanel).LeCpanelshowsdynamicPowerdensityspectrumfromLAXPCobserva.ons.Asmassfalls,qpoevolves(rises)andexploresextremecondi.onsnearneutronstar.QPOfrequencyevolvesfrom~820Hzto850Hz

LeCpanelshowsdynamicpowerdensitySpectrumfromLAXPCobserva.onof4U1728-34.Weobserved820HzHFQPOsshowingdriCtohigherfrequency.

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NGC4151withLAXPC103-80keVspectrumfit(5-50keVrangeexcluded)Whichclearlyshowspresenceofreflec.oncomponentandironline

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GRB160422AGRB160425A

LAXPCobservedGRBinApril,2016:lightcurvesandenergyspectrum:ThiswasnotinLAXPCobjec.ves,butwecanstudythem.Itwillneedsomeeffortstomodifydetectorresponse.

Conclusion

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Exciting Science to come … need more data of background

(once every month)

LAXPCInstrumentteam

Thanks!

JSYadavTIFRMumbai 3919/07/16

ISROSatelliteCentre(ISAC),Bangalore,RamanResearchIns.tute,Bangalore,

VikramSarabhaiSpaceCentre,Trivandrum,SpaceApplica.onsCentre,Ahmedabad

IUCAA,Pune&SeveralcolleaguesatTIFR,Mumbai,PRL,Ahemdabad