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XMM EPIC MOS Andy Read EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 XRT Point Spread Function - Conclusion of spectral and spatial.

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Presentation on theme: "XMM EPIC MOS Andy Read EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 XRT Point Spread Function - Conclusion of spectral and spatial."— Presentation transcript:

1 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 XRT Point Spread Function - Conclusion of spectral and spatial studies involving EPIC data from MCG-6-30-15, 3C 273,… - New XRTn_XPSF_000n.CCF files - Comparisons of PSF files - Extreme low-Energy features - King+Gaussian PSF profiling

2 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Radius (pixels: 1.1”) Power-law index vs. Radius Normalization vs. Radius Very bright point source – ~ 300 ks, low pile-up, low-BG, singles spectra (2-10keV) extracted from different annuli

3 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 ON-AXIS -Analysis of King Profile PSF in CCF - Core Radius R0 and slope alpha show strong energy dependence APPROACH 1 - Redo entire spectral analysis using altered King profiles with various R0-E and Alpha-E dependencies - Initial results suggested a far flatter energy dependence is required MOS 1 PSF KING (r) =α r0r0 α [1+(r/r 0 )²] A_________ King PSFs in the CCF

4 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MOS 2 ON-AXIS PN

5 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Alpha vs RNorm. vs R o o o o PSF=CCF(KING)

6 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 PSF=CCF(HIGH-ACC) original boundary! (no energy dependence) MCG-6-30-15 Norm. vs RAlpha vs R

7 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 APPROACH #1 - Exploration of parameter space in King profile R0- and Alpha-dependence --- Alter CCF files (XPSF, extension 70 [King], just on-axis values) --- Redo entire analysis (3 observations, 3 instruments, 8 spectra/ARFs) --- Re-alter CCF files (XPSF) and repeat… - Number of these searched-for (S) PSF dependencies give good results e.g. MOS1 R0=4.5 (constant with E) alpha=1.45-1.36 (decreasing with E) MOS2 R0=4.5 (constant with E) alpha=1.45-1.36 (decreasing with E) PN R0=5.0 (constant with E) alpha=1.65-1.38 (decreasing with E) …(also more complex dependencies can give even better results…)

8 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Alpha vs RNorm. vs R o o o o PSF=Best-S( earched )

9 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Alpha vs RNorm. vs R o o o o PSF=CCF(KING)

10 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Alpha vs RNorm vs R PSF=S(earched)

11 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Alpha vs RNorm vs R PSF=CCF(King)

12 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 APPROACH #2 - Data of sufficient quality to calculate PSFs in small energy bands - Development of software to fit King profiles to images - See how these King profiles compare to those in the CCF - Use these King profile PSFs in the spectral analysis

13 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Examples of King profile fits to narrow-band images MOS1 Rev 303 6 keV PN Rev 301 3 keV

14 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 PSF King-profile fitting results - MGC06 MOS1 Exposure-weighted ON-AXIS CCF Best S(earch)

15 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG06 MOS2 ON-AXIS CCF Best S(earch)

16 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Best S(earch) ON-AXIS CCF MCG06 PN

17 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Alpha vs RNorm. vs R o o o o PSF=CCF(KING)

18 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Alpha vs RNorm. vs R o o o o PSF=King-Fit

19 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Alpha vs RNorm. vs R o o o o PSF=Best-S

20 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Alpha vs RNorm. vs R o o o o PSF=AMR1

21 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MOS 1 r0r0 α CCF(King)AMR1(King) [distr. 17/12/03]

22 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MOS 2 r0r0 α CCF(King)AMR1(King) [distr. 17/12/03]

23 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 PN r0r0 α CCF(King)AMR1(King) [distr. 17/12/03]

24 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 3C273 Power-law index vs radius Radius (1.1″ pixels) PSF=CCF(King)PSF=AMR1 |||||||||||||||||||||| 18 M1/M2 SW Obs.

25 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 3C273 Normalization vs radius Radius (1.1″ pixels) PSF=CCF(King)PSF=AMR1 ||||||||||||||||||||||

26 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Independent study [RDS] PKS 0558-504 [Rev 84] inner 5″[MOS], 10″[PN] excluded SASccf AMR1 0.2-2 keV 2-10 keV 0.2-2 keV 2-10 keV Slope Flux Slope Flux Slope Flux Slope Flux M1 3.08 2.07 1.95 9.19 3.10 2.10 2.03 8.77 M2 3.07 2.13 1.95 9.60 3.09 2.16 2.04 9.10 PN 3.05 1.90 2.04 7.64 3.08 2.22 2.15 8.12 AMR1 fluxes agree better for both energy ranges χ² better for low-E fit High-E still not too good, though may be due to non-PSF effects Testing new PSFs (Distributed 17/12/03)

27 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Independent study [RDS] Very bright transient, inner 20″ excluded SASccf AMR1 1-9 keV 1-9 keV Slope Flux Slope Flux M2 1.62 9.57 1.76 9.24 PN 1.74 8.45 1.77 8.32 Diff 0.12 13% 0.01 11% Massive improvement in slope fit Still a normalization problem (though perhaps a non-PSF effect) Testing new PSFs

28 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Testing new PSFs Independent study [RDS] – Mkn205 PN M1 M2 Radii Slope Flux Slope Flux Slope Flux 0-10 1.72±0.02 5.47±0.13 1.75±0.06 6.05±0.58 1.85±0.04 5.98±0.27 0-20 1.70±0.02 5.54±0.12 1.75±0.05 6.17±0.59 1.78±0.05 5.95±0.50 0-40 1.70±0.02 5.54±0.12 1.73±0.05 6.18±0.52 1.80±0.04 6.00±0.21 0-60 1.72±0.02 5.53±0.09 1.73±0.05 6.26±0.53 1.82±0.04 6.03±0.22 0-120 1.70±0.02 5.82±0.14 1.72±0.04 6.45±0.24 1.77±0.04 6.46±0.25 5-40 1.72±0.02 5.52±0.15 1.73±0.06 6.02±0.69 1.78±0.05 5.77±0.28 10-60 1.71±0.03 5.53±0.24 1.72±0.06 6.33±0.52 1.72±0.07 6.20±0.65 20-80 1.73±0.09 6.09±1.19 1.72±0.10 6.48±0.83 1.86±0.09 6.61±0.63 Slopes consistent (except perhaps for M2 0-10″) Fluxes OK (except for 0-120″ - poor BG subtraction or faint extended emission)

29 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Comparison of PSFs: Enclosed Energies M1 M2 PN SASccf - Enclosed energy versus energy @ 25″ - SASccf PSFs

30 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Comparison of PSFs: Enclosed Energies M1 M2 PN AMR1 - Enclosed energy versus energy @ 25″ - AMR1 PSFs

31 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Comparison of PSFs: Enclosed Energies M1 M2 PN - Ratio of enclosed energy (AMR1/SASccf) versus energy @ 25″

32 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Comparison of PSFs: Enclosed Energies M1 M2 PN - Ratio of enclosed energy (AMR1/SASccf) versus energy @ 45″

33 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Comparison of PSFs: Enclosed Energies M1 M2 PN - Ratio of enclosed energy (AMR1/SASccf) versus energy @ 70″

34 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Reducing the PN EE? -Choose the high end of the R 0 values (~6.0) and the low end of the α values (~1.56) - Gives rise to lower EE (80-81% @25″) - Are the spectral results still OK? …

35 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Alpha vs RNorm. vs R o o o o PSF=260204

36 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 MCG-6-30-15 Alpha vs RNorm. vs R o o o o PSF=AMR1

37 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Extreme Low-Energy Features 6 12 18 24 30 pixels(1.1 ″) - Analysis of low-E (<250eV M1/M2 spectra in radial annuli (0-30 pixels [1 pixel=1.1″]) - Annulus 1 [6-12] 2 [12-18] 3 [18-24] 4 [24-30] + comparison with centre - Centres obtained via Gaussian fitting to images

38 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Variation of spectrum with radius Rev 0094 (3C273) MOS1 MOS2 R=0-6 Ann.1 6-12/0-6 Ann.2 12-18/0-6 Ann.3 18-24/0-6 Ann.4 24-30/0-6 - Relatively fewer low-E events at larger radius

39 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Variation of spectrum with radius Rev 0303(MCG06-30-15) MOS1 MOS2 R=0-6 Ann.1 6-12/0-6 Ann.2 12-18/0-6 Ann.3 18-24/0-6 Ann.4 24-30/0-6 - M1 [soft] shows effect more than M2 [hard]

40 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 - Rel. fewer low-E events at large-R - M1 [soft] effected more than M2 [hard] Hardness ratio [HR] versus Rev for Annuli 1-4 - Value 1: spectrum same as at centre - Relative deficit in extreme low-E photons seen to increase with radius - Effect appears less prominent at later revolution number Ann.1 Ann.2 Ann.3 Ann.4

41 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Hardness ratio [HR] versus Rev for Annuli 1-4 for one source (3C273) - Again, effect less prominent at later revolution number Ann.1 Ann.2 Ann.3 Ann.4

42 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Hardness ratio [HR] versus central hardness ratio [HR0] for Annuli 1-4 Ann.4 Ann.3 Ann.2 Ann.1 - Value 1: spectrum same as at centre - Just the soft spectrum sources (low HR0) that show the relative deficit of low-E photons effect - These are mainly M1 - Very soft sources have lots of direct extreme low-E photons (i.e. small %age of redistributed photons). - Low-E photons in hard sources may be nearly all redistributed - Likely a PSF effect that is the cause – (e.g. a more compact ex.low-E M1 PSF)

43 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Ratio of M1 central hardness ratio [HR0] to M2 central hardness ratio versus Rev - i.e. effect of very different spectral shapes (e.g. Rev0094 3C273) - Difference appears to get less at later revolutions - Explainable if redistribution is getting worse with rev – Increasing redistribution is diluting the effect of different ex.low-E PSFs – At later Revs, relatively more <160eV photons are redistributed, rather than arriving directly.

44 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Ex.Low-E PSFs for M1 & M2 - Using stacked 0301-0303 MCG06-30-15 observations - < 160 eV and 160-250 eV - M1 <160 eV PSF is indeed more compact! <160 eV 160-250 eV R 0 α R 0 α M1 5.1 1.8 4.9 1.6 M2 4.0 1.5 4.3 1.5

45 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Effects of low-E changes? M1 - Added ex.low-E changes to AMR1 PSF (shown left [M1, theta=0]) - Effects (e.g. spectral) expected only to appear at very low energies (<250eV) - However, large effects observed at large energies (2keV, 5keV)!

46 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Effects of low-E changes? M1 - Analysis shows that spline fitting to points has gross effects far from low energy regions - High-energy effective area values subsequently effected M1

47 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 Effects of low-E changes? M1 -Tiny changes to individual point values can lead to sensible spline fits -No changes above ~250eV - General warning that interpolations may not be giving what we expect - Also CAL interpolation may be different from e.g. my interpolation M1

48 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 PSF King+Gaussian [KG] Fitting - King fits sometimes underestimate the PSF profile at the very centre PSF KG (r) = _________ [1+(r/r 0 )²] α A + Be -Cr² ↑ ↑ KING + GAUSSIAN - Would require new software [CAL, arfgen etc…] to access it

49 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 PSF King+Gaussian [KG] Fitting - e.g. M1 100 eV - Large Gaussian component required (ratio of normalizations 25±1%)

50 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 PSF King+Gaussian [KG] Fitting - e.g. PN 3000 eV - Very small (~0) Gaussian component required (ratio of normalizations 1±1%) - PN’s larger pixels insensitive to the very core of the PSF

51 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 M2 100eVM2 1500eVM2 3000eV M2 4500eVM2 6000eVM2 7500eV

52 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 PSF King+Gaussian [KG] Fitting - Ratio of normalizations [Gauss/King] versus Energy - M1/M2 : Significant Gauss component allowed, especially at low/medium-E – [no Gauss component required at high-E] - PN : No Gauss component required (except perhaps at lowest-E [1.8±0.6%])

53 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 PSF King+Gaussian [KG] Fitting - Comparison of AMR1 PSF and KG PSF - M1 100eV - Effective area @ 25″ increases by 0.5% AMR1 KG

54 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 PSF King+Gaussian [KG] Fitting - Comparison of AMR1 PSF and KG PSF - M2 3000eV - Effective area @ 25″ increases by 0.8% AMR1 KG

55 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04 PSF King+Gaussian [KG] Fitting - Comparison of AMR1 PSF and KG PSF - PN 3000eV - Effective area @ 25″ decreases by 0.9% - Unsure as yet as to changes to any spectral analysis results (using arfgen) AMR1 KG

56 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04

57 XMM EPIC MOS Andy Read (amr30@star.le.ac.uk) EPIC CAL/OPS Meeting Vilspa, Spain 23-24/03/04

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