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The EPIC-pn detector stability
Low energies: RX J1856.5-3754 Medium energies: 1E0102 High energies (resolution): Eta Carinae

Frank Haberl
EPIC cal meeting, Garching, 4-5 May 2006


RX J1856.5­3754: A `stable` neutron star Model: tbabs*bbody
Simultaneous fit with all parameters linked except norm: 1.000 1.008 0.995 0.983 0.989 · 5 observations in FF mode + thin1 filter · 1 observation in timing mode + thin1 filter ± ± ± ± 0.005 0.005 0.005 (*) 0.004

(*) 69 intervals in STDGTI extension! exposure overestimated also seen in other cases (RX J1605 up to 10%)


Individual fits with all parameters free:

Simultaneous fits with NH linked:

RX J1856.5­3754: A `stable` neutron star

Model: tbabs*bbody


The SNR 1E0102


1E0102 EPIC-pn spectra


Line energies


FF read-out mode

norm 1.000 0.999 1.024 1.001 0.995 0.988


LW read-out mode

norm 1.000 0.986 0.988 1.011 1.029 0.986


SW read-out mode

norm 1.000 0.998 1.008 0.955 1.000


Filter dependence

norm 1.000 0.871 0.988 0.940 0.993

High background Many short GTIs problems with exposure No MOS thin2


Dependence on read-out mode

Norm 1.000 0.992 0.928 0.928 0.918 0.923

Single-pixel events


Dependence on read-out mode Single- and double-pixel events
SW SW LW LW FF FF Norm S SD 1.000 1.000 0.992 0.993 0.928 0.958 0.928 0.957 0.918 0.942 0.923 0.945 Etot / s eV eV/s 737 12946 738 12879 756 12863 756 12825 771 13013 768 12895

pile-up shifts events to higher energies no energy gets lost but shifts to different patterns


Pattern distribution

pile-up origin of mode dependence ? repeat analysis with central part of PSF excluded flux comparison in different modes: make sure that pile-up free


2000-07-26

Eta Carinae

2006-01-31

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Model: egde*pow + gaus + gaus + gaus + gaus Fe I 6.424 keV Fe XXV (f) 6.634 keV Fe XXV (i) Fe XXV (r) 6.699 keV Fe K-edge Fe XXV He 7.881 keV (blend with Ni XXVII f/i/r) Fit results: E3 (keV): (eV): 2000-07-26 6.694 ± 0.003 46 ± 5

1 = 2 = 3 = 4 E1 = E3 ­ 0.275 E2 = E3 ­ 0.065 E3 EE E4

N1 N2 = N3 · 0.441 N N
3

4

2006-01-31 6.658 ± 0.004 40 ± 8


FF Mn-K Pos CCD 1 - 6

Konrad Dennerl

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