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

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

pn Quantum Efficiency (QE)

RX J1856.5-3754 (PEM)

PKS 2155 SW/TI medium EPIC-pn response 6.2

2 = 10700 / 2012 dof

PKS 2155 SW medium EPIC-pn response 6.2+QE around O-edge

PKS 2155 SW medium EPIC-pn response 6.3

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

Energy shift at Au- and O-edge

Au-edge (SW mode)

Average 0.995 +- 0.001

O-edge (SW mode)

SNRs N132D and 1E0102

Spectrum

O VII / VIII line energies

Average 1.004 +- 0.001

PEM Energy to channel conversion

Vela SNR

0.2 – 1.2 keV Rev 533+534

Vela SNR spectra

Near CAMEX Away CAMEX

O VII line energies in Vela

Long term trends (internal cal source)

Long term trends (internal cal source)

Long term trends (soft response)

Long term trends (soft response)

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

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