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Properties of EPIC pn at low energies: LW mode PowerPoint Presentation
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Properties of EPIC pn at low energies: LW mode

Properties of EPIC pn at low energies: LW mode

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Properties of EPIC pn at low energies: LW mode

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  1. Properties of EPIC pn at low energies: LW mode EPIC pn at low energies: LW mode

  2. Long closed LW exposures EPIC pn at low energies: LW mode

  3. EPIC-pn at low energies (LW) Correction of offset shifts EPIC pn at low energies: LW mode

  4. offset correction: before rev 546 rev 553 EPIC pn at low energies: LW mode

  5. offset correction: after rev 546 rev 553 EPIC pn at low energies: LW mode

  6. EPIC-pn detector noise (LW) residual offset map rev 546 EPIC pn at low energies: LW mode

  7. EPIC-pn detector noise (LW) residual offset map rev 553 EPIC pn at low energies: LW mode

  8. EPIC-pn detector noise (LW) residual offset map rev 730 EPIC pn at low energies: LW mode

  9. EPIC-pn detector noise (LW) residual offset map rev 790 EPIC pn at low energies: LW mode

  10. EPIC-pn detector noise (LW) residual offset map rev 974 EPIC pn at low energies: LW mode

  11. individual offset maps median of offset maps EPIC pn at low energies: LW mode

  12. residual offset maps rev 546 rev 790 EPIC pn at low energies: LW mode

  13. cleaned residual offset maps rev 546 rev 790 EPIC pn at low energies: LW mode

  14. rev 546 cleaned residual offset map residual offset map EPIC pn at low energies: LW mode

  15. 20 adu image, rev 546 EPIC pn at low energies: LW mode

  16. 20 adu image, rev 546 before the correction of offset shifts EPIC pn at low energies: LW mode

  17. 20 adu image, rev 546 after the correction of offset shifts EPIC pn at low energies: LW mode

  18. offset correction: before rev 546 rev 553 EPIC pn at low energies: LW mode

  19. offset correction: after rev 546 rev 553 EPIC pn at low energies: LW mode

  20. offset correction: before rev 730 rev 974 EPIC pn at low energies: LW mode

  21. offset correction: after rev 730 rev 974 EPIC pn at low energies: LW mode

  22. EPIC-pn at low energies (LW) Low energy noise EPIC pn at low energies: LW mode

  23. EPIC-pn detector noise 50.7 ks closed FF (rev 059) Quadrant 0 adu EPIC pn at low energies: LW mode

  24. Detector noise in FF and eFF mode FF detector noise per sec is ~2.16 times higher in FF than in eFF 2.16 : 1 eFF EPIC pn at low energies: LW mode

  25. Detector noise in FF and eFF mode FF LW detector noise per sec is ~2.16 times higher in FF than in eFF 2.16 : 1 eFF EPIC pn at low energies: LW mode

  26. LW 1.71 : 1 FF Detector noise in LW and FF mode detector noise per sec is ~1.7 times higher in LW than in FF* *in the LW area EPIC pn at low energies: LW mode

  27. EPIC pn at low energies: LW mode

  28. closed FF rev 462 23.2 ks 3 0 50 0 EPIC pn at low energies: LW mode

  29. Vela SNR FF rev 534 38.8 ks withoutepreject EPIC pn at low energies: LW mode

  30. Vela SNR FF rev 534 38.8 ks with epreject EPIC pn at low energies: LW mode

  31. EPIC-pn detector noise in LW mode EPIC pn at low energies: LW mode

  32. 20 50 adu EPIC-pn detector noise (LW) Original method (“method 1”): Suppression of events below 50 adu according to a reference noise distribution deduced from long calclosed exposures Shown in blue is the result of this method applied to a (long) calclosed exposure, to illustrate the effect on a very faint X-ray source 100% suppression EPIC pn at low energies: LW mode

  33. 20 50 adu EPIC-pn detector noise (LW) Original method (“method 1”): Suppression of events below 50 adu according to a reference noise distribution deduced from long calclosed exposures Shown in blue is the result of this method applied to a (long) calclosed exposure, to illustrate the effect on a very faint X-ray source 99% suppression EPIC pn at low energies: LW mode

  34. 20 50 adu EPIC-pn detector noise (LW) Original method (“method 1”): Suppression of events below 50 adu according to a reference noise distribution deduced from long calclosed exposures Shown in blue is the result of this method applied to a (long) calclosed exposure, to illustrate the effect on a very faint X-ray source 90% suppression EPIC pn at low energies: LW mode

  35. 20 50 adu EPIC-pn detector noise (LW) Original method (“method 1”): Suppression of events below 50 adu according to a reference noise distribution deduced from long calclosed exposures Shown in blue is the result of this method applied to a (long) calclosed exposure, to illustrate the effect on a very faint X-ray source 70% suppression EPIC pn at low energies: LW mode

  36. 20 50 adu EPIC-pn detector noise (LW) Original method (“method 1”): Suppression of events below 50 adu according to a reference noise distribution deduced from long calclosed exposures Shown in blue is the result of this method applied to a (long) calclosed exposure, to illustrate the effect on a very faint X-ray source 50% suppression EPIC pn at low energies: LW mode

  37. 20 50 adu EPIC-pn detector noise (LW) • This method works well for bright sources, but may cause an apparent deficit of photons between ~150 and 250 eV for faint sources • Other problem: inhomogeneous residual noise at ~20 adu EPIC pn at low energies: LW mode

  38. EPIC-pn detector noise (LW) Alternative method (“method 2”): Try to determine the noise properties at higher energies and extrapolate them down to 20 adu EPIC pn at low energies: LW mode

  39. EPIC-pn detector noise (LW) rev 790, all events range used for fit: 40-100 adu range shown: 20-400 adu log-log EPIC pn at low energies: LW mode

  40. EPIC-pn detector noise (LW) rev 790, all events range used for fit: 40-100 adu range shown: 20-400 adu x lin y log EPIC pn at low energies: LW mode

  41. EPIC-pn detector noise (LW) rev 790, all events range used for fit: 40-100 adu range shown: 20-100 adu x lin y log EPIC pn at low energies: LW mode

  42. EPIC-pn detector noise (LW) rev 790, all events range used for fit: 40-100 adu range shown: 20-400 adu x lin y log EPIC pn at low energies: LW mode

  43. EPIC-pn detector noise (LW) rev 790, all events range used for fit: 40-100 adu range shown: 20-400 adu x log y log EPIC pn at low energies: LW mode

  44. EPIC-pn detector noise (LW) rev 790, all events range used for fit: 40-100 adu range shown: 20-400 adu x log y log EPIC pn at low energies: LW mode

  45. EPIC-pn detector noise (LW) rev 790, all events range used for fit: 40-100 adu range shown: 20-400 adu x log y log for comparison: method 1 EPIC pn at low energies: LW mode

  46. EPIC-pn detector noise (LW) method 2, rev 790 EPIC pn at low energies: LW mode

  47. EPIC-pn detector noise (LW) method 2, rev 546 EPIC pn at low energies: LW mode

  48. EPIC-pn detector noise (LW) method 2, rev 553 EPIC pn at low energies: LW mode

  49. EPIC-pn detector noise (LW) method 2, rev 730 EPIC pn at low energies: LW mode

  50. EPIC-pn detector noise (LW) method 2, rev 974 EPIC pn at low energies: LW mode