3x3 binning pattern experiment

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3x3 binning pattern experiment

• Richard (Tao) Song , Jenny Carter, Steve Sembay
• University of Leicester

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Aims

• See how different pattern distributions for 3x3
  binned event list is from normal event list
• Check the normal event list pattern distributions
  against the CCF
• Create pattern distribution fractions for the 3x3
  mode
• Eventually create a nice QE CCF for the 3x3
  binning mode
• Use recent observation of Vela SNR
• Normal
• DATE-OBS 2007-05-01T190357
• LIVETIME 47.8 ks
• NAXIS2 1139927
• 3x3 binning
• DATE-OBS 2007-05-01T190357
• LIVETIME 31.4 ks
• NAXIS2 3057523

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Selection region for analysis
Excluding bright col. here
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Comparing normal event list to CCF pattern
distribution - PHA
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Comparing normal event list to CCF pattern
distribution - PI
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Fitting

• Use logarithmic binning and spline fitting

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PHA
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PI
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PHA
PI
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Scaling CCF

• Use ratio 3x3 binning to normal and use this
  scale factor to scale the CCF
• File EMOS1_QUANTUMEFF_0017.CCF
• Extensions FRACTION_CHANNEL, FRACTION_ENERGY

Red is the 3x3 fraction distribution, green is
the normal binning distribution
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Future work and conclusions

• Look at spectral differences between normal and
  3x3 binning
• Apply background subtraction to current analysis
• Look at MOS2
• Compare with any more observations
• Apply the ratio found to the current CCF, give to
  RS.
• create a new 3x3 QE CCF

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Extra slides
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