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EPIC-PN Response Matrix Update: Known Problems in PN6.6 and SAS6.0

This document summarizes updates on known problems related to the EPIC-PN response matrix during the SAS6.0 meeting held by Frank Haberl. Key issues include redistribution at 400 eV, flat shelf observations, spectral residuals at Si and Au edges used for gain fits, and specific case studies on sources like PKS 2155 and MKN 421. The report outlines improvements in gain at the Au edge, analysis of quantum efficiency around the Si-K edge, and adjustments to mirror effective areas, highlighting significant c²/dof improvements.

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EPIC-PN Response Matrix Update: Known Problems in PN6.6 and SAS6.0

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  1. The EPIC-PN response matrix - update Known problems in PN6.6 / SAS6.0 Frank Haberl EPIC Cal meeting, VILSPA, 23.-24. March 2004

  2. 1) Redistribution at 400 eV

  3. 2) Flat shelf

  4. 3) Si and Au edges Residuals in spectra used for gain fits at Au edge: PKS 2155 Mkn 421 3C273 MCG-6-30-15

  5. 3) Gain at Au edge

  6. 3) Si and Au edges - improvements MCG-6-30-15 240 ksec merged from 3 revolutions 1.4 Million Counts 1.1-4 keV binned to at least 500 cts dips at 1.80, 2.00 keV bump at 2.40 keV c2/dof = 1045/578 = 1.81

  7. 3) Quantum efficiency around Si-K edge EPIC-pn EPIC-MOS singles

  8. 3) EPIC-pn doubles

  9. 3) EPIC-pn singles

  10. 3) Trough in QE around 1800 eV ? Approximation by Gaussian absorption line

  11. 3) Gauss approximation

  12. 3) Au edge in mirror effective area Adjustment to mirror effective areas from MOS Crab spectra 15 eV shift + increases Proposed fine adjustment from pn spectrum of MCG-6-30-15

  13. 3) Test with adjusted mirror areas c2/dof improvement from 1045/578=1.81 to 632/577=1.10

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