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					    What can we do with Pattern 31s?

  Quadruples                                     - Central pixel (red) has
                                                 highest charge (sum:E1)
                                                 - Other pixels above
  Triples                                        threshold in 3x3 box
                                                 (green) (sum:E2)

   Doubles


                                                 - White pixels must be below
                                                 threshold
Singles                                          - Crossed pixels are indifferent




  XMM          Andy Read (amr30@star.le.ac.uk)
  EPIC         EPIC Calibration Meeting
  MOS          Mallorca, Spain 01/02/05
                                                   - Orsay test data @ 8keV

 Orsay data @ 8kev
                                                   - Significant number of P31
                                                   events
                                                   - P0-12    : 54.2%
                                                   - P31      : 44.2%
                                                   - All others : 1.6%


                                                   - Energy (E1+E2) is corrupted
                                                   - Requires correcting




           E1+E2 (ADU)
XMM                  Andy Read (amr30@star.le.ac.uk)
EPIC                 EPIC Calibration Meeting
MOS                  Mallorca, Spain 01/02/05
                                                          - P31 events (4,5,6…15keV)
               Orsay data                           15keV shown in sum-ratio plane
Ratio
               P31 events                                      -Above a threshold, P31
E1/E2                                                          events of a certain energy
                                                               occupy a particular space in
                                                               the Sum-Ratio plane
                                                               - Can be used to assign
                      4keV                                     correct energies to events




                       SUM E1+E2 (ADU)
        XMM                  Andy Read (amr30@star.le.ac.uk)
        EPIC                 EPIC Calibration Meeting
        MOS                  Mallorca, Spain 01/02/05
-Fitting quadratics to events in the Sum-(log)Ratio plane for each energy (4-15 keV)




                        P31 @ 5 keV                                    P31 @ 8 keV




                                           Log E1/E2 Ratio



             Energy E1+E2 (ADU)                              Energy E1+E2 (ADU)
      XMM                    Andy Read (amr30@star.le.ac.uk)
      EPIC                   EPIC Calibration Meeting
      MOS                    Mallorca, Spain 01/02/05
                                        Correcting P31 Events
                P31 @ 4keV
                                   - Raw events in Sum-Ratio plane




4keV                           15keV

                                   -With models (4,5,6…15keV) and
                                   threshold



  Corrected Energy                 - Evaluate corrected energy for each event
                                   above threshold, using models and event
                                   position in Sum-Ratio plane



XMM                  Andy Read (amr30@star.le.ac.uk)
EPIC                 EPIC Calibration Meeting
MOS                  Mallorca, Spain 01/02/05
              P31 @ 8keV                               P31 @ 12keV




  Corrected Energy                                          Corrected Energy




XMM                  Andy Read (amr30@star.le.ac.uk)
EPIC                 EPIC Calibration Meeting
MOS                  Mallorca, Spain 01/02/05
                                       Combined 4,5,6…15keV Orsay data
       P31 @ 4,5,6…15 keV

                                   - Raw P31 events in Sum-Ratio plane




                                   -With models (4,5,6…15keV) and
                                   threshold (here quite high)




  Corrected Energy
                                   - Resolution not as good at higher energies
                                   (energy-dependent threshold?)




XMM                  Andy Read (amr30@star.le.ac.uk)
EPIC                 EPIC Calibration Meeting
MOS                  Mallorca, Spain 01/02/05
                                                   ‘Real’ Data
                                       MCG-06-30-15 MOS1 Rev0301
                                   - Raw events (All) in Sum-Ratio plane




                                   - Just P31 events, with models
                                   (4,5,6…15keV) and threshold



  Corrected Energy                 - P31 events (c.f. P0-12 events):
                                      Extra 11% @ >4 keV
                                      Extra 26% @ >6 keV
                                      Extra 32% @ >8 keV


XMM                  Andy Read (amr30@star.le.ac.uk)
EPIC                 EPIC Calibration Meeting
MOS                  Mallorca, Spain 01/02/05
                                         P31 image (4-12 keV)
                                         - Good signal-to-noise
                                         - low background


                                         - peak value: 127 cts
                                         - Source: 16.24 cts/pixel
                                         - BG    : 0.15 cts/pixel




XMM    Andy Read (amr30@star.le.ac.uk)
EPIC   EPIC Calibration Meeting
MOS    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




      XMM                    Andy Read (amr30@star.le.ac.uk)
      EPIC                   EPIC Calibration Meeting
      MOS                    Mallorca, Spain 01/02/05

				
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posted:4/19/2013
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