MOS Timing Mode calibration

Marcus KirschMarcus Kirsch

Science Operations & Data Systems Division Research & Scientific Support Department

XMM-NewtonXMM-Newton

MOS Timing Mode calibrationMOS Timing Mode calibration

Marcus G. F. Kirsch, B. Altieri, R. SaxtonMarcus G. F. Kirsch, B. Altieri, R. Saxton

Marcus KirschMarcus KirschScience Operations & Data Systems Division

Research & Scientific Support Department


EPICEPICmenumenu

energy calibrationenergy calibration flux calibrationflux calibration MOS Timing versus pnMOS Timing versus pn




EPICEPICSituation last cal meetingSituation last cal meeting

black: LWblack: LW red: Timingred: Timing

MOS LW versus Timing

1

1.005

1.01

1.015

1.02

1.025

0.4 0.6 0.8 1 1.2 1.4

LW Energy in keV

Tim

ing_

En/

LW

_En

MOS1

MOS2

trend is similar trend is similar for both MOSsfor both MOSs

Timing mode is Timing mode is overcorrected overcorrected by up to 1.5 %by up to 1.5 %




EPICEPICreason for over correctionreason for over correction

CTI correction is performed for events with CTI correction is performed for events with y-values from 0-1024 (just a counter with y-values from 0-1024 (just a counter with no meaning in that mode) with the mean no meaning in that mode) with the mean of ~ 500of ~ 500

CTI correction should however be CTI correction should however be performed for y=300 for ALL eventsperformed for y=300 for ALL events

Now implemented in SAS 6.0




EPICEPIC1E0102-SAS 6.01E0102-SAS 6.0

0.4-2.0 keV:0.4-2.0 keV:Timing mode agrees with LW mode Timing mode agrees with LW mode within +/- 0.5 %.within +/- 0.5 %.


0.985

0.99

0.995

1

1.005

1.01

1.015

1.02

1.025

0.4 0.6 0.8 1 1.2 1.4

LW Energy in keV

Tim

ing_

En

/LW

_En

MOS1

MOS2

MOS1_new

MOS2_new




EPICEPICSS433: SAS 6.0SS433: SAS 6.0

M1 Timing MediumM2 FF Medium


0.9850.99

0.9951

1.0051.01

1.0151.02

1.025

0 1 2 3 4 5 6 7 8

LW Energy in keV

Tim

ing_

En/

LW

_En

MOS1

MOS2

MOS1_new

MOS2_new

MOS1_SS442


0.9850.99

0.9951

1.0051.01

1.0151.02

1.025

0 1 2 3 4 5 6 7 8

LW Energy in keV

Tim

ing_

En/

LW

_En MOS1

MOS2

MOS1_new

MOS2_new

MOS1_SS442

pn

M1 Timing MediumM2 FF Mediumpn SW Medium

pn(Timing) > MOS ?pn(Timing) > MOS ? pn(Timing) = pn(FF)± 0.3 %pn(Timing) = pn(FF)± 0.3 %

at 6 keV ~ +0.3 %at 6 keV ~ +0.3 %




EPICEPICCas-A analysis 2002Cas-A analysis 2002

pn < Chandra < MOSpn < Chandra < MOS Rational: Rational:

– CAS-A is very brightCAS-A is very bright– MOS CTI model does MOS CTI model does

not take precursors into not take precursors into account account CTI over correction CTI over correction

contradictory to SS433 contradictory to SS433 ??????

CAS-A cross cal

0.986

0.988

0.99

0.992

0.994

0.996

0.998

1

0 1 2 3 4 5 6 7

MOS Energy in keV

ratio

pn/MOS

Chandra/MOS

pn/Chandra




EPICEPICFlux: Calibration sourceFlux: Calibration source

MOS1 flux in MOS1 flux in Timing mode at Timing mode at Mn seems to be Mn seems to be 10 % lower10 % lower




EPICEPICFlux: NGC 5548 (rev 290)Flux: NGC 5548 (rev 290)MOS Timing Medium M2 SW Mediumpn SW Medium

Fit:const*(model_linked) Fit:const*(model_linked) –M1: 1.0M1: 1.0–M2: 1.02M2: 1.02–PN: 1.16PN: 1.16

below 0.6 keV:below 0.6 keV:– MOSs agreeMOSs agree– but less flux than pnbut less flux than pn

above 8 keV problem above 8 keV problem in MOS Timing mode in MOS Timing mode




EPICEPICFlux: SS433 (rev 610)Flux: SS433 (rev 610)pn Timing Medium M1 Timing MediumM2 FF Medium Medium

Fit Fit const*(model_linked) const*(model_linked)

–pn: 1.0pn: 1.0–M1: 0.94M1: 0.94–M2: 0.52 (pileup) M2: 0.52 (pileup)

below 0.6 keV:below 0.6 keV: problem in MOS problem in MOS Timing mode Timing mode above 8 keV above 8 keV problem in MOS problem in MOS Timing mode Timing mode




EPICEPICFlux: HER-X1 (rev 207)Flux: HER-X1 (rev 207)

pn:1 pn:1 MOS: 0.9MOS: 0.9

flux in 0.315- 10.0 keVflux in 0.315- 10.0 keV– pn: 1.66E-09 erg cmpn: 1.66E-09 erg cm-2-2ss-1 -1

– MOS: 1.55E-09 erg cmMOS: 1.55E-09 erg cm-2-2ss-1-1

– MOS/pn: 0.93MOS/pn: 0.93

pn Timing MOS1 Timingpn Timing MOS1 Timing

Fit with linked parameters and const Fit with free parameters and const=1




EPICEPICSummarySummaryEnergy calibration:Energy calibration: MOS timing mode energy calibration agrees within MOS timing mode energy calibration agrees within

± 0.3 % with MOS-LW data± 0.3 % with MOS-LW data at ~ 6-7 keV at ~ 6-7 keV

– pn Timing mode > MOS Timing mode by 0.3 % (SS433) pn Timing mode > MOS Timing mode by 0.3 % (SS433) – pn Timing mode > pn FF mode by 0.3 % (Cas-A) pn Timing mode > pn FF mode by 0.3 % (Cas-A) – MOS FF mode should agree there with MOS Timing mode if source is not extended and MOS FF mode should agree there with MOS Timing mode if source is not extended and

bright bright For bright extended sources MOS would need a rate dependent CTI model !For bright extended sources MOS would need a rate dependent CTI model ! Rev 832: Cas-A observation in Rev 832: Cas-A observation in

– pn: FF and extFFpn: FF and extFF– MOS: Timing and LW MOS: Timing and LW

Flux calibration:Flux calibration: Discrepancy of up to 10-15 % at energies below 1keVDiscrepancy of up to 10-15 % at energies below 1keV Contradictory results for different targets and observations Contradictory results for different targets and observations

Cas-A data for all EPIC modes + other SNR data Cas-A data for all EPIC modes + other SNR data will allow overall energy calibration analysiswill allow overall energy calibration analysis

Is the MOS timing mode not stable in flux ?

MOS Timing Mode calibration

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