XMM EPIC MOS Andy Read EPIC Calibration Meeting Mallorca, Spain 01/02/05 What can we do with Pattern 31s? - Central pixel (red) has.

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Presentation transcript:

XMM EPIC MOS Andy Read EPIC Calibration Meeting Mallorca, Spain 01/02/05 What can we do with Pattern 31s? - Central pixel (red) has highest charge (sum:E1) - Other pixels above threshold in 3x3 box (green) (sum:E2) - White pixels must be below threshold - Crossed pixels are indifferent Quadruples Triples Doubles Singles

XMM EPIC MOS Andy Read EPIC Calibration Meeting Mallorca, Spain 01/02/05 - Orsay test 8keV - Significant number of P31 events - P0-12 : 54.2% - P31 : 44.2% - All others : 1.6% - Energy (E1+E2) is corrupted - Requires correcting Orsay 8kev E1+E2 (ADU)

XMM EPIC MOS Andy Read EPIC Calibration Meeting Mallorca, Spain 01/02/05 Ratio E1/E2 4keV 15keV Orsay data P31 events - P31 events (4,5,6…15keV) shown in sum-ratio plane -Above a threshold, P31 events of a certain energy occupy a particular space in the Sum-Ratio plane - Can be used to assign correct energies to events SUM E1+E2 (ADU)

XMM EPIC MOS Andy Read EPIC Calibration Meeting Mallorca, Spain 01/02/05 Energy E1+E2 (ADU) 8 keV -Fitting quadratics to events in the Sum-(log)Ratio plane for each energy (4-15 keV) 5 keV Log E1/E2 Ratio Energy E1+E2 (ADU)

XMM EPIC MOS Andy Read EPIC Calibration Meeting Mallorca, Spain 01/02/05 4keV - Raw events in Sum-Ratio plane -With models (4,5,6…15keV) and threshold - Evaluate corrected energy for each event above threshold, using models and event position in Sum-Ratio plane Correcting P31 Events Corrected Energy 4keV15keV

XMM EPIC MOS Andy Read EPIC Calibration Meeting Mallorca, Spain 01/02/05 12keV Corrected Energy

XMM EPIC MOS Andy Read EPIC Calibration Meeting Mallorca, Spain 01/02/05 Combined 4,5,6…15keV Orsay data - Raw P31 events in Sum-Ratio plane -With models (4,5,6…15keV) and threshold (here quite high) - Resolution not as good at higher energies (energy-dependent threshold?) Corrected Energy 4,5,6…15 keV

XMM EPIC MOS Andy Read EPIC Calibration Meeting Mallorca, Spain 01/02/05 ‘Real’ Data MCG MOS1 Rev Raw events (All) in Sum-Ratio plane - Just P31 events, with models (4,5,6…15keV) and threshold - P31 events (c.f. P0-12 events): Extra >4 keV Extra >6 keV Extra >8 keV Corrected Energy

XMM EPIC MOS Andy Read EPIC Calibration Meeting Mallorca, Spain 01/02/05 P31 image (4-12 keV) - Good signal-to-noise - low background - peak value: 127 cts - Source: cts/pixel - BG : 0.15 cts/pixel

XMM EPIC MOS Andy Read EPIC Calibration Meeting Mallorca, Spain 01/02/05 Implementation… - Decide on E1/E2 threshold(s) (e.g. function of energy?) - Evaluate, from ground data, %ages of P31s above threshold as function of energy - Include these %ages in MOS QE files - Include above-threshold-P31s in SAS event files - Calculate correct PI values (as done here) for above-threshold-P31s (SAS?) - Include simple P31 RMF in CCF response files