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Timing Mode PSF Columns Analysis: Flux and Spectral Fitting Effects

This article discusses the analysis of PSF columns in timing mode, focusing on flux per column, spectral fitting effects, and practical considerations. It introduces a new integrated PSF image technique and explores the impact of excluding inner columns. The findings highlight residual problems and provide insights into the consistency of spectral parameters.

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Timing Mode PSF Columns Analysis: Flux and Spectral Fitting Effects

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  1. The Timing Mode PSF Richard Saxton, Maria Diaz Trigo, Matteo Guainazzi

  2. Columns in Timing mode

  3. Current SAS: Flux per column Col Constant 0 1.0 1 1.23 1.65 2.15 2.53 3.14 3.78 4.69 Fit to Vela with: Const * wabs * plaw

  4. SAS 8 arfgen - GX 339+4 (1000 c/s) All columns All – col 0 All – col-1 to col+1 All – col-2 to col+2 All – col-3 to col+3 All – col-4 to col+4

  5. SAS 8 arfgen - 1254 (600 c/s) 1254

  6. SAS 8: Add up annular contriutions

  7. New arfgen method: Integrate the PSF image

  8. Integrated PSF image technique

  9. Integrated PSF image technique +10% -10% Flux in inner 9 cols / flux in cols -4 to -2 and +2 to +4

  10. Practical spectral fitting effects Spectrum NH=2.3E+22 Gauss = 6.44 keV 1.04 keV 0.02 Disk_T = 2.26 Bbod_T = 1.06 Tbabs (gauss*diskbb*bbod)

  11. Practical spectral fitting effects Original Spectrum NH=2.3E+22 Gauss = 6.44 keV 1.04 keV Disk_T = 2.26 Bbod_T = 1.06 +10% Ignore Inner 3 cols -10% * Linear ramp NH=2.32E+22 Gauss = 6.42±0.04 1.06±0.04 Disk_T = 2.40±0.09 +15% * Ramp with extra at 6keV NH=2.34E+22 Gauss = 6.55±0.03 0.99±0.04 Disk_T = 2.34±0.09 Ignore Inner 5 cols -10%

  12. MKN 421 simple power-law test Excluding inner 3 columns gives a 15% decrease in measured flux. Slope is stable.

  13. Conclusions • Major problem with ARF in SAS 8 when inner columns are excluded in timing mode observations. • New image integration technique fixes this • Residual problem at 15% level in flux if inner 3 cols excluded • Spectral parameters reasonably consistent so looking acceptable…

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