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Mallorca EPIC Cal Meeting - February 2005 Darren Baskill:http://www.star.le.ac.uk/~dbl XMM project: MOS monitoring.

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Presentation on theme: "Mallorca EPIC Cal Meeting - February 2005 Darren Baskill:http://www.star.le.ac.uk/~dbl XMM project: MOS monitoring."— Presentation transcript:

1 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/ MOS monitoring Fading Cal sources MOS CTI Column Correction

2 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/ Problem spotted in 1E0102… MOS CTI Column Correction

3 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/ 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

4 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/ 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

5 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/ 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)

6 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/ Al Gaussian centroid position offset from the average – individual columns over 6 time periods

7 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/ MOS1 Col319 Al Orbital revolution Deviation from CCD average (adu)

8 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/ MOS2 Al Col 290 Col 291 Col 289 Orbital revolution Energy Offset (adu) Time dependency

9 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/ MOS1 column 320 Energy dependency? Do the size of the offsets depend on energy

10 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/ Mn K  offset Al offset Stacked rev 718-920 CalClosed’s, MOS1 CCD1, sas6.1.0 Each point represents a single column Energy dependence y=-0.069+0.25x No energy dependence

11 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/ 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 CTIC PHA=PHA+rawX.(ctiX+colcorr)+rawY.ctiY but this an approximation to… CTIC PHA=PHA*(1+ctiX/PHA)^rawX… & rawY Which equation should we use?

12 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/ MOS1 col. 320 no Energy dependence in the column offset correct Energy (10 eV bins)

13 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/ MOS1 col. 320 Energy dependence in the column offset correct Energy (10 eV bins)

14 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/ MOS2 col. 291 no Energy dependence in the column offset correct Energy (10 eV bins)

15 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/ MOS2 col. 291 Energy dependence in the column offset correct Energy (10 eV bins)

16 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/ EPIC-MOS Monitoring Gain eV adu eV=cons+linr*adu

17 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/ MOS1 - Al line energy

18 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/ MOS1 - MnK  line energy

19 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/ MOS2 linear term also fine… MOS1 - Linear Term

20 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/ MOS1 - Constant Offset Term

21 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/ MOS2 - MnK  line energy

22 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/ EPIC-MOS Fading Cal sources MOS1 Mnk  MOS1 Al

23 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/ 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…!

24 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/ 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….

25 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/ Please send me your calibration talks! dbl@star.le.ac.uk

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