Experience with combined Fe 55 / Tycho SNR calibration

1. Experience with combined Fe55 / Tycho SNR calibration NRCO 71 EPIC Calibration & Operations Meeting Mallorca, Spain, 2008 April 7 - 8

2. Internal calibration source onboard XMM-Newton / EPIC-pn Al-K Mn-K

3. 30 ks in 2000  210 ks in 2008 30 ks 10 ks

5. does the internal calibration source disturb the Tycho observation ? does Tycho disturb the calclosed measurement ? Experience with combined Fe55 / Tycho SNR calibration • General plan: • start with ‘normal’ Tycho observation • add the internal calibration source • finish with ‘normal’ calclosed observation • Unfortunately, this sequence was scheduled as three independent observations, performed in a non-contiguous mode • superposition with short-term changes in the absolute energy scale • no firm conclusions about potential changes of the absolute energy scale possible • however: general idea about ‘calopen’ observations

6. Experience with combined Fe55 / Tycho SNR calibration 1) Tycho FF Medium, 2007-12-30 / 19:55 – 2007-12-31 / 03:37, 27 ks

7. Experience with combined Fe55 / Tycho SNR calibration 2) Tycho FF Cal Medium, 2008-01-01 / 19:58 – 2008-01-02 / 09:59, 50 ks

8. Experience with combined Fe55 / Tycho SNR calibration 3) Calclosed, 2008-01-03 / 01:06 – 2008-01-03 / 08:11, 25 ks

9. 1) Tycho FF Medium, 2007-12-30 / 19:55 – 2007-12-31 / 03:37, 27 ks

10. 2) Tycho FF Cal Medium, 2008-01-01 / 19:58 – 2008-01-02 / 09:59, 50 ks

11. 3) Calclosed, 2008-01-03 / 01:06 – 2008-01-03 / 08:11, 25 ks

12. 5.75 6.00 keV adu Narrow-line images at Mn-K: 5.70 – 6.05 keV ΔE = 350 eV

13. Narrow-line images at Mn-K: 5.70 – 6.05 keV scaled to the same exposure time ΔE = 0.35 keV Tycho CalClosed Tycho + CalClosed

14. Tycho + CalClosed all energy bands centered on Mn-K ΔE = 0.35 keV ΔE = 1.0 keV ΔE = 2.0 keV ΔE = 5.0 keV

15. Narrow-line images at Al-K: 1.375 – 1.575 keV 1.25 1.50 1.75 keV adu ΔE = 200 eV

16. Narrow-line images at Al-K: 1.375 – 1.575 keV scaled to the same exposure time ΔE = 0.20 keV Tycho CalClosed Tycho + CalClosed

17. calclosed

18. Tycho

19. Tycho + calclosed

20. Mn-K calclosed

21. Mn-K Tycho + calclosed

22. Al-K calclosed

23. Al-K Tycho + calclosed

24. CTI determination: Illustration of the Template Cross Correlation method (EPIC pn) 25 macro pixels, 20-29 singles per macro pixel

25. calclosed CTI

26. Tycho + calclosed CTI

27. Tycho + calclosed CTI 

28. Experience with combined Fe55 / Tycho SNR calibration • Tycho + calclosed seems ok for Mn-K, but not for Al-K • Tycho better suited for LW than for FF • Calclosed & LW no useful combination  are there celestial calibration targets which are better suited for a combined Fe55 exposure ?

29. Vela SNR

30. Vela SNR (62 ks)

31. calclosed (25 ks)

32. Vela SNR + calclosed (scaled to 62 ks)

33. Experience with combined Fe55 / Tycho SNR calibration • Vela + calclosed might be an interesting alternative: • the parts of the Vela SNR covered by the FOV are similarly extended as the internal calibration source • the X-ray surface brightness of the Vela SNR is similar to that of the internal calibration source • the X-ray spectrum of the Vela SNR is almost complementary to that of the internal calibration source • But the Al-K region would need to be checked in detail..