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MOS monitoring Fading Cal sources MOS CTI Column Correction

MOS monitoring Fading Cal sources MOS CTI Column Correction. MOS CTI Column Correction. Problem spotted in 1E0102…. Problem spotted in 1E0102…. Variation in column-to-column counts cause by variations in column-to-column CTI left: Jean’s plot col320 Vs neighbouring 4 columns

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MOS monitoring Fading Cal sources MOS CTI Column Correction

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  1. MOS monitoring Fading Cal sources MOS CTI Column Correction Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  2. MOS CTI Column Correction Problem spotted in 1E0102… Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  3. Problem spotted in 1E0102… • Variation in column-to-column counts • cause by variations in column-to-column CTI • left: Jean’s plot • col320 Vs neighbouring 4 columns • <500eV, effects embadpixfind • Two main problem columns – MOS1 c320, MOS2 c291 Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  4. Time dependency? Energy dependency? time Time dependency… Predictably, it evolves with time as Jean spotted… But we can track the time variability in the CalClosed data Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  5. Method: • - Combine many CalClosed observations (inter-flare periods, per >~100 rev) • Produce a data cube of RawX Vs RawY Vs Energy (after SAS CTI correction) • Fit Gaussian to each bin (1 column wide, 60 pixels long) Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  6. Col 290 Col 291 Col 289 Energy Offset (adu) MOS2 Al Time dependency Orbital revolution Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  7. Energy dependency? Do the size of the offsets depend on energy MOS1 column 320 Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  8. Stacked rev 718-920 CalClosed’s, MOS1 CCD1, sas6.1.0 Each point represents a single column Energy dependence y=-0.069+0.25x Al offset No energy dependence Mn Ka offset Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  9. Which equation should we use? CTIC PHA=PHA+rawX.(ctiX+colcorr)+rawY.ctiY but this an approximation to… CTIC PHA=PHA*(1+ctiX/PHA)^rawX…& rawY for energy of ~1keV : evts.pha~300 ADU with low CTI of 0.01 ADU/transfer … Approx method = 300+300*0.01=303 Better method = 300*(1+0.01/300)^300 = 303.19 <1ev difference For a bad CTI=0.2 ADU/transfer (i.e. a 60 ADU/200 eV shift at 1keV) Approx method = 300+300*0.2= 360 Better method = 300*(1+0.2/300)^300 = 366.391 ~20eV difference Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  10. MOS1 col. 320 no Energy dependence in the column offset correct Energy (10 eV bins) Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  11. MOS1 col. 320 Energy dependence in the column offset correct Energy (10 eV bins) Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  12. MOS2 col. 291 no Energy dependence in the column offset correct Energy (10 eV bins) Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  13. MOS2 col. 291 Energy dependence in the column offset correct Energy (10 eV bins) Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  14. eV=cons+linr*adu eV adu EPIC-MOS Monitoring Gain Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  15. MOS1 - Al line energy Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  16. MOS1 - MnKa line energy Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  17. MOS1 - Linear Term MOS2 linear term also fine… Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  18. MOS1 - Constant Offset Term Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  19. MOS2 - MnKa line energy Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  20. EPIC-MOS Fading Cal sources MOS1 Mnka MOS1 Al Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  21. EPIC-MOS Fading Cal sources • IDL script to merge several CalClosed observations into one • Should work with all SAS tasks • If anyone wishes to test it…! Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  22. Conclusions… • Monitoring – update CCFs with new gain constant offset for a couple of CCDs? • MOS column-by-column doable & accurate – need SAS programming • Should column-by-column correction be just an offset or an energy dependent offset? • …and finally…. Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

  23. Please send me your calibration talks! dbl@star.le.ac.uk Mallorca EPIC Cal Meeting - February 2005 Darren Baskill: http://www.star.le.ac.uk/~dbl XMM project: http://www.src.le.ac.uk/projects/xmm/

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