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Analysis of the soft response of pn and MOS with a sample of blazars

Analysis of the soft response of pn and MOS with a sample of blazars. Silvano Molendi (IASF-MI). Motivation. Evaluate impact of mos eff. areas change This is a major change. Impact on pn/mos cross calibration is possibly largest ever. Example of old vs new pn/mos.

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Analysis of the soft response of pn and MOS with a sample of blazars

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  1. Analysis of the soft response of pn and MOS with a sample of blazars Silvano Molendi (IASF-MI)

  2. Motivation Evaluate impact of mos eff. areas change This is a major change Impact on pn/mos cross calibration is possibly largest ever.

  3. Example of old vs new pn/mos Residuals in the form of ratio data/model for PN data on MOS best fitting model

  4. Example of old vs new pn/mos Residuals in the form of ratio data/model for PN data on MOS best fitting model

  5. How Sample of 21 blazars from XMM-Newton archive Featureless objects with simple pow-law spectra Most have no reported evidence of intrinsic absorption Look at spectral parameters, particularly NH, to evaluate changes following changes in MOS arfs.

  6. The Sample All data reduced with SAS 7.1 Emchain & Epchain + soft proton screening some objects piled up (epatplot + reference cr from uhb sec 3.3.2 Tab 3 ) extraction in annuli (iterative core extrusion ) arfs and rmfs generated using standard tools MOS1, MOS2 (pattern 0-12) and pn (0-4) flag==0 for MOS and pn

  7. The Exercise All data reduced with SAS 7.1 Emchain & Epchain + soft proton screening some objects piled up (epatplot + reference cr from uhb sec 3.3.2 Tab 3 ) extraction in annuli (iterative core extrusion ) arfs and rmfs generated using standard tools MOS1, MOS2 (pattern 0-12) and pn (0-4)

  8. The Exercise/2 For mos1 and mos2 generated old arfs cifbuild analysisdate followed by arfgen Spectra fit in 0.5-10 keV band with “wabs*pow” model all params free Some 60 spectra 100 fits

  9. Results Look at NH MOS1 vs MOS2 for old qe

  10. Results Agreement btwn MOS1 & MOS2 does not change Look at NH MOS1 vs MOS2 for new qe

  11. New vs Old - MOS1

  12. New vs Old – MOS2

  13. New vs Old – MOS2 • Points fall exactly on model • X2 is less than 1 • Data is the same, only arf is different • The increase in O depth corresponds to an increase of NH, assuming standard O abundances, of 2x1020

  14. New MOS vs PN Very good agreement btwn MOS and PN!

  15. X-ray vs 21cm NH • old • new

  16. X-ray vs 21cm NH Excluded all objects with excised piled-up core • old • new

  17. Very low NH objects There are 6/17 objects with NH < 1020 Soft excess ? Possible for flat spectrum objects, unlikely for steep spectrum objects

  18. Soft excess?

  19. X-ray vs 21cm NH Exclude all objects with excised piled-up core

  20. Summary New arfs result in smaller NH ~2x1020 For the fist time we have good agreement btwn MOS and PN The blazar exercise failed its major goal, it did not help us in establishing which of the two arfs is better.

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