3x3 binning pattern experiment

1. Richard (Tao) Song , Jenny Carter, Steve Sembay University of Leicester 3x3 binning pattern experiment

2. 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: 2007-05-01T19:03:57 • LIVETIME : 47.8 ks • NAXIS2 : 1139927 • 3x3 binning: • DATE-OBS: 2007-05-02T09:00:01 • LIVETIME : 31.4 ks • NAXIS2 : 3057523

3. Selection region for analysis Excluding bright col. here

4. Comparing normal event list to CCF pattern distribution - PHA

5. Comparing normal event list to CCF pattern distribution - PI

6. Fitting • Use logarithmic binning and spline fitting

7. PHA PHA – 3x3

8. PI PI – 3x3

9. PHA PI

10. 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

14. Future work and conclusions • Check gain etc. of the 3x3 mode • 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

16. Extra slides