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MOS Timing Mode calibration

MOS Timing Mode calibration. Marcus G. F. Kirsch, B. Altieri, R. Saxton. menu. energy calibration flux calibration MOS Timing versus pn. Situation last cal meeting. Timing mode is overcorrected by up to 1.5 %. black: LW red: Timing. trend is similar for both MOSs.

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MOS Timing Mode calibration

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  1. MOS Timing Mode calibration Marcus G. F. Kirsch, B. Altieri, R. Saxton

  2. menu • energy calibration • flux calibration • MOS Timing versus pn

  3. Situation last cal meeting • Timing mode is overcorrected by up to 1.5 % • black: LW • red: Timing • trend is similar for both MOSs

  4. reason for over correction • CTI correction is performed for events with y-values from 0-1024 (just a counter with no meaning in that mode) with the mean of ~ 500 • CTI correction should however be performed for y=300 for ALL events Now implemented in SAS 6.0

  5. 1E0102-SAS 6.0 • 0.4-2.0 keV:Timing mode agrees with LW mode within +/- 0.5 %.

  6. SS433: SAS 6.0 • pn(Timing) > MOS ? • pn(Timing) = pn(FF)± 0.3 %at 6 keV ~ +0.3 % M1 Timing Medium M2 FF Medium pn SW Medium M1 Timing Medium M2 FF Medium

  7. Cas-A analysis 2002 • pn < Chandra < MOS • Rational: • CAS-A is very bright • MOS CTI model does not take precursors into account  CTI over correction • contradictory to SS433 ???

  8. Flux: Calibration source • MOS1 flux in Timing mode at Mn seems to be 10 % lower

  9. Fit:const*(model_linked) M1: 1.0 M2: 1.02 PN: 1.16 below 0.6 keV: MOSs agree but less flux than pn above 8 keV problem in MOS Timing mode Flux: NGC 5548 (rev 290) MOS Timing Medium M2 SW Medium pn SW Medium

  10. Fit const*(model_linked) pn: 1.0 M1: 0.94 M2: 0.52 (pileup) below 0.6 keV: problem in MOS Timing mode above 8 keV problem in MOS Timing mode Flux: SS433 (rev 610) pn Timing Medium M1 Timing Medium M2 FF Medium Medium

  11. pn:1 MOS: 0.9 flux in 0.315- 10.0 keV pn: 1.66E-09 erg cm-2s-1 MOS: 1.55E-09 erg cm-2s-1 MOS/pn: 0.93 Flux: HER-X1 (rev 207) Fit with linked parameters and const Fit with free parameters and const=1 pn Timing MOS1 Timing pn Timing MOS1 Timing

  12. Summary Energy calibration: • MOS timing mode energy calibration agrees within ± 0.3 % with MOS-LW data • at ~ 6-7 keV • pn Timing mode > MOS Timing mode by 0.3 % (SS433) • 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 bright • For bright extended sources MOS would need a rate dependent CTI model ! • Rev 832: Cas-A observation in • pn: FF and extFF • MOS: Timing and LW Flux calibration: • Discrepancy of up to 10-15 % at energies below 1keV • Contradictory results for different targets and observations Cas-A data for all EPIC modes + other SNR data will allow overall energy calibration analysis Is the MOS timing mode not stable in flux ?

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