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The EPIC-pn spectral response

The EPIC-pn spectral response in SAS 5.4.1 has seen significant advancements. Recent findings from the EPIC meeting in Tübingen (February 2003) highlight updates such as the Oxygen edge correction, adjustments to quantum efficiency, and the resolution of low-energy redistribution issues. Additionally, the importance of stability and long-term trends in internal calibration sources is emphasized, alongside critical data from isolated neutron stars and BL Lac objects. These developments are aimed at refining spectral analysis for better astrophysical insights.

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The EPIC-pn spectral response

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  1. The EPIC-pn spectral response • Status of the pn spectral response in SAS5.4.1 • Latest developments in the pn spectral response Frank Haberl EPIC Cal meeting, Tübingen, 3.-4. February 2003

  2. Status of the pn spectral response in SAS5.4.1 Last meeting (Vilspa July 2002) The Oxygen edge: Fudge to reduce the depth RX J1856.5-3754: Redistribution at low energies (PEM) Now implemented (SAS5.4.1) New Quantum Efficiency curve RX J1856.5-3754: Redistribution re-adjustment SW mode CTI correction: reduce over-correction

  3. pn Quantum Efficiency (QE)

  4. RX J1856.5-3754 (PEM)

  5. PKS 2155 SW/TI medium EPIC-pn response 6.2 c2 = 10700 / 2012 dof

  6. PKS 2155 SW medium EPIC-pn response 6.2+QE around O-edge

  7. PKS 2155 SW medium EPIC-pn response 6.3

  8. Latest developments in the pn spectral response The energy scale Au-edge, O-edge (BL Lacs) Emission lines (N132D and 1E0102) Vela SNR Long-term stability Internal cal source Isolated neutron stars

  9. Energy shift at Au- and O-edge

  10. Au-edge (SW mode) Average 0.995 +- 0.001

  11. O-edge (SW mode)

  12. SNRs N132D and 1E0102

  13. Spectrum

  14. O VII / VIII line energies Average 1.004 +- 0.001

  15. PEM Energy to channel conversion

  16. Vela SNR 0.2 – 1.2 keV Rev 533+534

  17. Vela SNR spectra Near CAMEX Away CAMEX

  18. O VII line energies in Vela

  19. Long term trends (internal cal source)

  20. Long term trends (internal cal source)

  21. Long term trends (soft response)

  22. Long term trends (soft response)

  23. RXJ0720.4-3125 pn summary Revolution 0078 0175 0533 0534 Readout mode FF FF FF FF Filter thin medium thin thin Event pattern singles singles singles singles Ext. rad. (´´) 40 40 40 40 87% PSF Flux (10-12 erg s-1) 9.78 9.92 9.74 9.78 0.1-2.4 keV Flux relative 1.000 1.015 0.995 1.002 Flux (10-12 erg s-1) 11.24 11.40 11.20 11.24 PSF corrected PSPC: 11.5 LETG: 9.9 Ext. rad. (´´) 20-40 15-40 20-40 20-40 NH (1020) 1.55 1.69 1.68 1.39 typical error 0.2 LETG: 1.59 Bbody kT (eV) 82.8 82.5 86.2 86.9 typical error 1.1 LETG: 81.6

  24. Current status of EPIC-pn responsePN 6.4 CTI under correction at 600 eV in FF mode (Vela) change will influence all modes (increases energies which are already too high) needs ´gain´ reduction at low energies can be done in energy-channel conversion in PEM CTE degradation seems to slow down some further monitoring before action

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