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The EPIC-pn spectral response
Frank Haberl EPIC Cal meeting, Tübingen, 3.-4. February 2003
•Status of the pn spectral response in SAS5.4.1
•Latest developments in the pn spectral response
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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
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pn Quantum Efficiency (QE)
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RX J1856.5-3754 (PEM)
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PKS 2155 SW/TI medium EPIC-pn response 6.2
2 = 10700 / 2012 dof
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PKS 2155 SW medium EPIC-pn response 6.2+QE around O-edge
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PKS 2155 SW medium EPIC-pn response 6.3
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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
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Energy shift at Au- and O-edge
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Au-edge (SW mode)
Average 0.995 +- 0.001
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O-edge (SW mode)
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SNRs N132D and 1E0102
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Spectrum
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O VII / VIII line energies
Average 1.004 +- 0.001
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PEM Energy to channel conversion
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Vela SNR
0.2 – 1.2 keV Rev 533+534
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Vela SNR spectra
Near CAMEX Away CAMEX
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O VII line energies in Vela
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Long term trends (internal cal source)
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Long term trends (internal cal source)
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Long term trends (soft response)
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Long term trends (soft response)
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RXJ0720.4-3125 pn summary
Revolution 0078 0175 0533 0534Readout mode FF FF FF FFFilter thin medium thin thinEvent pattern singles singles singles singles
Ext. rad. (´´) 40 40 40 40 87% PSFFlux (10-12 erg s-1) 9.78 9.92 9.74 9.78 0.1-2.4 keVFlux relative 1.000 1.015 0.995 1.002Flux (10-12 erg s-1) 11.24 11.40 11.20 11.24 PSF corrected PSPC: 11.5 LETG: 9.9Ext. rad. (´´) 20-40 15-40 20-40 20-40NH (1020) 1.55 1.69 1.68 1.39 typical error 0.2 LETG: 1.59Bbody kT (eV) 82.8 82.5 86.2 86.9 typical error 1.1 LETG: 81.6
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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 PEMCTE degradation seems to slow down some further monitoring before action