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XMM­Newton CCF Release Note
XMM­CCF­REL­205
pn telescope e#ective area modification at high energies
M.G.F. Kirsch
April 7, 2006
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
XRT3 XAREAEF 0011 2000­01­13T00:00:00 ONAXISXAREAEF 3.169 NO
2 Changes
XMM EPIC­pn observations with very high statistic show residuals at high energies above 6 keV
(see Figure 2). This features can be explained by not perfect calibration of the telescope e#ective
area.
2.1 ONAXISXAREAEF
The e#ective area for the EPIC­pn telescope have been changed mainly for energies between 6 and
12 keV. This will reduce residuals at high energies for data with high statistics. This has been
implemented in extension ''ONAXISXAREAEF'' in XRT3 XAREAEF 0011.CCF.
Figure 1 shows the di#erence between the old XRT3 XAREAEF 0010.CCF (black) and the new
XRT3 XAREAEF 0011.CCF (red).
1

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Figure 1: E#ective area of the on telescope. Black: XRT3 XAREAEF 00010.CCF red:
XRT3 XAREAEF 0011.CCF
3 Scientific Impact of this Update
The adjustment was derived from fits to the spectra of 3C273, PKS2155 and H1426+428. As an ex­
ample plots for 3C273 are using the old XRT3 XAREAEF 0010.CCF and the new XRT3 XAREAEF 0011.CCF
are shown in Figure 2.
4 Estimated Scientific Quality
# 2 values and # 2
red
improves in all three target cases as shown in the table below:
3C273 H1426 PKS2155
CCF # 2 (# 2
red
) # 2 (# 2
red
) # 2 (# 2
red
)
XRT3 XAREAEF 0010 4748 (1.202) 3448 (1.207) 5194 (1.159)
XRT3 XAREAEF 0011 4494 (1.138) 3398 (1.186) 5137 (1.146)

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Figure 2: 3C273: upper with XRT3 XAREAEF 0010.CCF lower: with
XRT3 XAREAEF 0011.CCF
5 Test procedures & results
The CCF has been tested on 3C273, PKS2155 and H1426+428 data.

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6 Expected Updates
none