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XMM-Newton CCF Release Note
XMM-CCF-REL-319 Up date of the RGS Gain and CTI
R. Gonzґlez-Riestra and C. de Vries a July 17, 2014

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CCF comp onents
Name RGS1 RGS2 RGS1 o f CCF ADUCONV 0025 ADUCONV 0028 CTI 0 0 1 3 VALDATE 2013-01-01T00:00:00 2013-01-01T00:00:00 2013-01-01T00:00:00 List of Blocks changed OFFSET GAIN OFFSET GAIN CTI CTI EXTENDED XCTI CTIY1-9 CTI CTI EXTENDED XCTI CTIY1-9 XSCS flag NO NO NO

RGS2 CTI 0014

2013-01-01T00:00:00

NO

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Changes

Last revision of the RGS Gain and CTI took place in July 2012 [1], when CCFs covering the time p eriod since August 2007, when RGS2 started to b e read through a single node, were released. The values of these parameters have now b een revised by C. de Vries (SRON) using calibration observations of Cap ella and PKS 2155-304 taken along the last two years. PKS 2155-304 has b een used in the derivation of these CCFs b ecause Mkn 421, that was used for this purp ose in the past, was not observable with XMM-Newton during this p eriod. It will b e observed regularly again starting in Spring 2015. Serial CTI and Gain are derived from on-axis observations of Cap ella and PKS 2155-304. Observations of the latter displaced ±2 arcmin off-axis in the cross-disp ersion direction have b een used to derive the parallel CTI.

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Figures 1, 2 and 3 show the evolution of the Gain and the Serial and Parallel CTIs over the last years.

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Scientific Impact of this Up date

The values of the RGS CCDs Gain and CTI are used to compute the energy (PI) of each detected event. The regular monitoring of these parameters is imp ortant to verify the correct placement of the extraction masks in the Wavelength/PI plane, the separation of the sp ectral orders and the separation of the first order from the system p eak at long wavelengths.

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Test pro cedures & results
· The fits viewer fv has b een used to insp ect the new CCFs, their structure, validity dates and contents. · The SAS task cifbuild has b een run to confirm that the right CCFs version is selected. · The observation of PKS 2155-304 in rev. 2633 (727770901) has b een processed with SASv13.5 using the new CCFs. Output files have b een compared with the result of the processing with the current CCFs (see Fig. 4). No significant differences have b een found, as exp ected, given the small change in the CTI and Gain values.

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Exp ected Up dates

Both CCFs should b e revised regularly to evaluate the degradation due to radiation. Observations of a bright continuum source off axis in the cross-disp ersion direction must b e p erformed every two years to monitor the parallel CTI.

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References

[1] "Recent evolution of RGS gain and CTI", A. Pollock, XMM-CCF-REL-289, July 2012 (http://xmm2.esac.esa.int/docs/documents/CAL-SRN-0289-1-0.ps.gz )


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Figure 1: Evolution of the RGS Gain since 2007 (left RGS1, right RGS2). The horizontal lines mark the validity p eriods of the different CCF versions.


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Figure 2: Evolution of the RGS Serial CTI since 2007 (left RGS1, right RGS2). RGS2 started to b e read through a single node (C) in August 2007. Since then, the serial CTI for RGS2 (formerly) node D is simply the negative of the node C values. The horizontal lines mark the validity p eriods of the different CCF versions.


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Figure 3: Evolution of the RGS Parallel CTI since 2007 (left RGS1, right RGS2). The p oints represented are the CTI values far from the chips edges. The horizontal lines mark the validity p eriods of the different CCF versions.


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Figure 4: Result of processing the observation of PKS 2155-304 taken in rev. 2633 (727770901) with the current CCFs (top) and the new ones (b ottom). The white lines are the default (95%) PI extraction regions for first and second orders.