RGS CALIBRATION STATUS
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1 RGS CALIBRATION STATUS ROSARIO GONZÁLEZ-RIESTRA XMM-NEWTON SCIENCE OPERATIONS CENTRE ON BEHALF OF THE SRON AND ESAC RGS TEAMS ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 1
2 Outline Instrument Status Operations Offsets CTE Bad Surface Calibration New CCFs Wavelength Scale Contamination Effective Area ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 2
3 Instrument Status Operations Offsets CTE Bad Surface Calibration New CCFs Wavelength Scale Contamination Effective Area ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 3
4 Operations ü RGS operations are running smoothly ü No changes in operational configuration ü No anomalies ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 4
5 Instrument Status Operations Offsets CTE Bad Surface Calibration New CCFs Wavelength Scale Contamination Effective Area ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 5
6 Offsets RGS1 node C RGS1 node D RGS2 ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 6
7 Instrument Status Operations Offsets CTE Bad Surface Calibration New CCFs Wavelength Scale Contamination Effective Area ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 7
8 CTE Relative Charge Transfer Efficiency RGS 1 RGS 2 cooling cooling single-node readout C. de Vries ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 8
9 Instrument Status Operations Offsets CTE Bad Surface Calibration New CCFs Wavelength Scale Contamination Effective Area ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 9
10 Bad Surface Number of Columns Columns found hot in > 95% of the observations RGS 1 RGS 2 12 columns (6+6) << 0.5 % of detector surface Year XMM-SOC-CAL-TN-0217 C.Gabriel ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 10
11 Bad Surface Number of Columns Columns found hot in > 25% of the observations RGS 1 RGS 2 < 2% of detector surface XMM-SOC-CAL-TN-0217 C.Gabriel Year ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 11
12 Instrument Status Operations Offsets CTE Bad Surface Calibration New CCFs Wavelength Scale Contamination Effective Area ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 12
13 Calibration files released since last Meeting CCF Release Note Purpose Date RGS[12]_EFFAREACORR_ Extrapolation of the correction to the RGS Effective Area beyond revolution 2816 June 2017 RGS1_HKPARMINT_0016 RGS2_HKPARMINT_ Increase in the RGA Temperature limits in revolutions 3249 and 3250 September 2017 ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 13
14 Instrument Status Operations Offsets CTE Bad Surface Calibration New CCFs Wavelength Scale Contamination Effective Area ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 14
15 Wavelength Scale σ: 5 må σ: 6 må AB Dor, HR 1099, Capella and Procyon Fainter emission line stars σ: 5 må σ: 5 må ü Heliocentric and Sun angle corrections applied ü Most recent XMM variable boresight (#28) ü No trend with time ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 15
16 Instrument Status Operations Offsets CTE Bad Surface Calibration New CCFs Wavelength Scale Contamination Effective Area ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 16
17 Contamination Current CCF Best fit C. de Vries ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 17
18 Instrument Status Operations Offsets CTE Bad Surface Calibration New CCFs Wavelength Scale Contamination Effective Area ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 18
19 Effective area: Flux changes in RXJ observations with target at boresight fluxed spectra fit to absorbed BB Decrease in the flux of the Isolated Neutron Star RXJ => Current model underestimates the contamination ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 19
20 Effective area: Flux changes in RXJ RGS 1 RGS 2 Optical Depth Transmission ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 20
21 Effective area: RXJ RGS vs. EPIC-pn EPIC-pn flux kev : constant within 2% (F. Haberl, priv. comm.) RGS1 [RGS2] flux kev, from fluxed spectra ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 21
22 Effective Area The flux of the ISN RXJ1856 has decreased in the last years The source is not variable The observed changes cannot be explained with (only) an increase in the thickness of the C 8 H 8 contamination layer Work in progress to confirm the change in effective area and quantify it Detailed analysis of selected targets: RXJ1856, Vela Pulsar, compact SNRs (1ES0102, N132D) Comparison with EPIC-pn data for BL Lacs (aka Rectification Factors ) Comparison with Chandra/LETG Evaluation of instrumental factors (detectors, optics ) ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 22
23 Preliminary results: Flux changes in the Vela Pulsar RGS1 RGS2 RGS1 RGS2 Vela Pulsar RXJ ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 23
24 Preliminary results: RXJ ,comparison with LETG Flux ratio at 27Å with respect to Chandra LETG model J. Kaastra ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 24
25 Preliminary results: Time-dependent rectification factors Flux Ratio RGS / EPIC-pn for a sample of BL Lacs ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 25
26 Summary and Conclusions ü RGS operations are running smoothly ü Instruments do not show any unexpected degradation ü Wavelength scale is stable. Accuracy is 5 må ü There are indications of a decrease in Effective Area; the reason is not understood yet ü Work in progress to quantify this effect and determine its origin ESA UNCLASSIFIED - For Official Use Rosario Gonzalez-Riestra 17/05/2018 Slide 26
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