XMM EPIC MOS Steve Sembay MPE 04/05/06 The Effective Area of EPIC A comparison of MOS1, MOS2 and PN derived fluxes of 17 on-axis AGN.

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Presentation transcript:

XMM EPIC MOS Steve Sembay MPE 04/05/06 The Effective Area of EPIC A comparison of MOS1, MOS2 and PN derived fluxes of 17 on-axis AGN observed between Revolutions 63 and 683

XMM EPIC MOS Steve Sembay MPE 04/05/06 OrbitSourceMOS FilterPN FilterInnerMos OuterPN Outer 63MS Thin Mkn 205Medium MS Thin C 273Medium C 273Medium C 273Medium C 273Medium Mkn 359Medium Mkn 509Thin Mkn 335Medium C 273Medium MCG Medium H Thin MS Thin C 273Thin Ark 120Thin H Thin 0800 The sample: Mixture of BL Lacs and “ Soft Excess ” AGN

XMM EPIC MOS Steve Sembay MPE 04/05/06 The Effective Area of EPIC Fluxes are derived in 4 energy bands keV, keV, keV, keV Methodology: Fit tbabs*po model (nH fixed at global value) in each band to each camera separately and derive absorbed flux. Pattern 0-12 (MOS) and Pattern 0-4 (PN) SAS with current public CCFs

XMM EPIC MOS Steve Sembay MPE 04/05/06 Example (3C 273) fits to PN, Model folded though MOS

XMM EPIC MOS Steve Sembay MPE 04/05/ Checking for pile-up in 3C 273

XMM EPIC MOS Steve Sembay MPE 04/05/ Checking for pile-up in 3C 273

XMM EPIC MOS Steve Sembay MPE 04/05/06 100*(MOS1-PN)/PN

XMM EPIC MOS Steve Sembay MPE 04/05/06 100*(MOS2-PN)/PN

XMM EPIC MOS Steve Sembay MPE 04/05/06 Band (keV) (MOS1-PN)/PN(MOS2-PN)/PN %-1.6% %+4.1% %+7.3% %+7.4%

XMM EPIC MOS Steve Sembay MPE 04/05/06 (MOS1-PN)/PN (MOS2-PN)/PN Thin Medium

XMM EPIC MOS Steve Sembay MPE 04/05/06 pn MOS1 MOS2 3c 273: Flux Comparison, 7.5 ” -40 ” v 15 ” -40 ” extraction radii Problem with the psf? – See talk by Andy later

XMM EPIC MOS Steve Sembay MPE 04/05/06 pn MOS1 MOS2 MCG : 0 ”, 7.5 ”, ”, 15 ” inner extraction radii, 40 ” outer Problem with the psf? – See talk by Andy later

XMM EPIC MOS Steve Sembay MPE 04/05/06 Band (keV) (MOS1-PN)/PN(MOS2-PN)/PN %-1.6% %+4.1% %+7.3% %+7.4%

XMM EPIC MOS Steve Sembay MPE 04/05/06 Quantum Efficiency measurements from Orsay MOS1 – Central CCD

XMM EPIC MOS Steve Sembay MPE 04/05/06 Quantum Efficiency measurements from Orsay MOS2 – Central CCD

XMM EPIC MOS Steve Sembay MPE 04/05/06 Surface Pixel Geometry in Monte Carlo model

XMM EPIC MOS Steve Sembay MPE 04/05/06 SEM Pictures Side View Top View

XMM EPIC MOS Steve Sembay MPE 04/05/06 (MOS1-PN)/PN +12% +2%

XMM EPIC MOS Steve Sembay MPE 04/05/06 (MOS2-PN)/PN +12% +2%

XMM EPIC MOS Steve Sembay MPE 04/05/06 H 2 O = 0.08 μm

XMM EPIC MOS Steve Sembay MPE 04/05/06 H 2 O = 0.08 μm SiO 2 = 0.05 μm

XMM EPIC MOS Steve Sembay MPE 04/05/06

XMM EPIC MOS Steve Sembay MPE 04/05/06 Summary: Shape of the MOS/PN discrepancy suggests problem lies with the quantum efficiency Adjustment of the MOS QE would be consistent with Orsay measurements and probable uncertainties in model Adjusting the QE would leave a residual normalisation offset of about 5-7% between MOS and PN Would need to increase MOS global effective area or decrease PN global effective area to achieve absolute consistency MOS low energy rmf would need re-calibration for consistency with any change in the QE

XMM EPIC MOS Steve Sembay MPE 04/05/06 Rate down 8% Flux down 5% Eff. Area down 3% Count Rate/Effective Area normalised to Rev 156 DatumComparison of high energy portion of the spectra from 795 and 903