EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode Properties of EPIC pn at low energies: LW mode.

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Presentation transcript:

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode Properties of EPIC pn at low energies: LW mode

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode Long closed LW exposures revolutiondata setexposure [s]date _PNS _PNS _PNS _PNS _PNU

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn at low energies (LW) Correction of offset shifts

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode rev 546rev 553 offset correction: before

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode rev 546rev 553 offset correction: after

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode rev 546 EPIC-pn detector noise (LW) residual offset map

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev 553 residual offset map

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev 730 residual offset map

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev 790 residual offset map

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev 974 residual offset map

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode individual offset maps median of offset maps

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode residual offset maps rev 546rev 790

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode rev 546rev 790 cleaned residual offset maps

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode rev 546 cleaned residual offset map residual offset map

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode 20 adu image, rev 546

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode 20 adu image, rev 546 before the correction of offset shifts

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode 20 adu image, rev 546 after the correction of offset shifts

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode rev 546rev 553 offset correction: before

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode rev 546rev 553 offset correction: after

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode rev 730rev 974 offset correction: before

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode rev 730rev 974 offset correction: after

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode Low energy noise EPIC-pn at low energies (LW)

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode adu Quadrant ks closed FF (rev 059) EPIC-pn detector noise

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode 2.16 : 1 Detector noise in FF and eFF mode FF eFF per sec detector noise per sec is ~2.16 times higher in FF than in eFF

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode 2.16 : 1 Detector noise in FF and eFF mode FF eFF per sec detector noise per sec is ~2.16 times higher in FF than in eFF LW

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode Detector noise in LW and FF mode 1.71 : 1 LW FF per sec detector noise per sec is ~1.7 times higher in LW than in FF * * in the LW area

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode closed FF rev ks

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode Vela SNR FF rev ks without epreject

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode with epreject Vela SNR FF rev ks

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise in LW mode

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) 100% suppression 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 2050 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) 2050 adu 99% suppression 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

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) 2050 adu 90% suppression 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

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) 2050 adu 70% suppression 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

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) 2050 adu 50% suppression 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

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode  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 detector noise (LW) 2050 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode Alternative method (“method 2”): Try to determine the noise properties at higher energies and extrapolate them down to 20 adu EPIC-pn detector noise (LW)

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode range used for fit: adu range shown: adu log-log EPIC-pn detector noise (LW) rev 790, all events

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) range used for fit: adu range shown: adu x lin y log rev 790, all events

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) range used for fit: adu range shown: adu x lin y log rev 790, all events

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) range used for fit: adu range shown: adu x lin y log rev 790, all events

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) range used for fit: adu range shown: adu x log y log rev 790, all events

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) range used for fit: adu range shown: adu x log y log rev 790, all events

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode for comparison: method 1 EPIC-pn detector noise (LW) range used for fit: adu range shown: adu x log y log rev 790, all events

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode method 2, rev 790 EPIC-pn detector noise (LW)

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) method 2, rev 546

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) method 2, rev 553

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) method 2, rev 730

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) method 2, rev 974

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode  Method 2 would work well if there were no temporal changes of the low-energy noise Whenever the noise properties of the sample and template are (slightly) different, the subtraction leads to residuals in the spectra and the images Other problem: assumption of constant noise properties along CCD rows (required in order to get enough statistics) not valid for raw events: EPIC-pn detector noise (LW)

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events 20 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events 21 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events 22 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events 23 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events 24 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events 25 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events 26 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events 27 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events 28 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events 29 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events 30 adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed after offset corrections all events adu

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) At which stage of the processing should the noise be suppressed ? Comparison of raw data with processed data (after pattern recognition and recombination):

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed no offset corrections all events 20 adu raw data

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed no offset corrections singles 20 adu processed data

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed no offset corrections all events adu raw data

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed no offset corrections all “entries” adu processed data

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed no offset corrections non-singles adu processed data

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (LW) rev ks closed no offset corrections singles adu processed data

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode Comparison with FF: EPIC-pn detector noise

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (FF) 20 adu raw data rev ks closed no offset corrections all events

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (FF) rev ks closed no offset corrections singles 20 adu processed data

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (FF) rev ks closed no offset corrections all events adu raw data

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (FF) rev ks closed no offset corrections all “entries” adu processed data

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (FF) rev ks closed no offset corrections non-singles adu processed data

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise (FF) rev ks closed no offset corrections singles adu processed data

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode EPIC-pn detector noise At which stage of the processing should the noise be suppressed ?  Noise near the CCD edges can be most efficiently suppressed by rejecting invalid patterns  Noise suppression should be done after the pattern recognition

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode raw_y adu noise EPIC-pn detector noise properties (FF) SAS CCF:  Also for FF, epreject may need some refinement..

EPIC Calibration Meeting, MPE K. Dennerl, 2006 May 04 EPIC pn at low energies: LW mode