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Cross calibration of RGS and MOS using Zeta Puppis
Jenny Carter, University of Leicester

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Aims
Observed energy

· Check low energy - gain relationship, currently linear extrapolation · Look at cross-calibration between RGS and MOS, checking energy scales and fluxes · How: use Zeta Puppis, other line rich sources
XMM EPIC MOS

Al

Mn

ADC

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Observations used
Revn. 0091 0156 0538 0542 0552 0636 0795 0903 0980 1071 1096 1164
XMM EPIC MOS

Obs. ID. 0095810301 0095810401 0157160501 0157160901 0157161101 0159360101 0159360301 0159360401 0159360501 0159360701 0159360901 0159361101

Exposure (ks) 57.35 40.55 42.28 43.65 38.94 69.16 61.29 63.04 64.18 30.06 53.53 52.91

EPIC Instruments MOS1 MOS1, 2, pn MOS1, 2, pn MOS1, 2, pn MOS1, 2, pn MOS1, 2, pn MOS1, 2, pn MOS1, 2, pn MOS1, 2, pn MOS1, 2, pn MOS1, 2, pn MOS1, 2, pn

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Analysis process
Fit RGS spectra Find best model Apply these models to MOS data Fit sections of the spectra Isolate section of spectra Tie lines together in group to subject line, find new E Tie cont. normalisation to subject line Calculate flux of section
XMM EPIC MOS

RGS analysis Compare RGS to MOS data

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Analysis - stage 1 for RGS
· Process: rgsproc for each obs. with SAS 7.0.0 · Xspec: apply model
model phabs * (gaussian + gaussian ... (36) + brems)

· fit and find best model for obs. · save this model for use with MOS
XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Stage 1 results for RGS
· Flux trends with revn.
· Combined band 0.3 ­ 2.0 keV
Fitted using REGRESS regression fit in IDL to get trend over time
Band Slope % drop over 1000 revns

0.3 ­ 2.0 keV 0.3 ­ 0.8 keV 0.8 ­ 2.0 keV

-1.242 -15 -7.078 -16 -4.879 -16

8.9 11.2 6.4

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Analysis ­ stage 2 for MOS
· Apply the best RGS models for each revn. found to MOS data, as produced by Steve with SAS 7.0.0 · Concentrate on certain lines, selected to cover a range of energies
Selection 1 Tie very close lines together and cont. norm 2 3 4
XMM EPIC MOS

RGS line (~keV) under study 0.432 0.801 1.023 1.856

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Fit examples ­ RGS and MOS
Line 1

Line 2

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Lines 3 and 4
Line 3

Line 4

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Stage 2 ­ results for MOS
· Line energy differences between subject line for RGS and MOS · Flux differences between RGS and MOS over selected energy ranges
Line RGS average line energy (keV) 1 2 3 4 0.4318 0.8271 1.0234 1.8614 MOS2 MOS1 average line average line energy energy (keV) 0.4332 0.8271 1.0276 1.8626 (keV) 0.4318 0.8271 1.0285 1.8614

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Line energy differences ­ line 1, MOS1

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Line energy differences ­ line 2, MOS1

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Line energy differences ­ line 3, MOS1

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Line energy differences ­ line 4, MOS1

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Line energy differences ­ line 1, MOS2

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Line energy differences ­ line 2, MOS2

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Line energy differences ­ line 3, MOS2

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Line energy differences ­ line 4, MOS2

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Mean fluxes for RGS and MOS
Line and E-range (keV) RGS average flux (ergs cm-2 s-1) MOS1 average flux (ergs cm-2 s-1) MOS2 average flux (ergs cm-2 s-1) 1.898â10-12 2.693â10-12 1.606â10-12 7.669â10-13

Although generally downward trend seen

1; 0.34 ­ 0.47 2; 0.76 ­ 0.90 3; 0.95 ­ 1.12 4; 1.65 ­ 2.00

1.841â10-12 2.368â10-12 1.460â10-12 8.471â10-13

1.968â10-12 2.497â10-12 1.549â10-12 7.321â10-13

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Flux differences RGS and MOS ­ line 1
Energy band: 0.34 ­ 0.47 keV

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Flux differences RGS and MOS ­ line 2
Energy band: 0.76 ­ 0.90 keV

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Flux differences RGS and MOS ­ line 3
Energy band: 0.95 ­ 1.12 keV

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Flux differences RGS and MOS ­ line 4
Energy band: 1.65 ­ 2.0 keV

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Tycho
Checking around the silicon line with the pn
pn MOS1 MOS2 1.858 ± 0.001 1.859 ± 0.002 1.859 ± 0.002

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Conclusions and future plans
· RGS flux decrease over time as shown by long-term blazar comparison, shown by Andy Pollock at the XMM-Newton Users Group MOS E-scale in agreement with RGS although systematic offset at ~1 keV of about 2-3 eV Higher energy line too weak in RGS to use as a calibration for MOS E-scale Scatter in flux values for both RGS and MOS, especially at low energies Flux of MOS generally above RGS values apart from highest energies Would like to look at other sources IES0102, Tycho and Procyon
Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006

·

· · · ·

XMM EPIC MOS


XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Procyon

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Brems. temperature with revn.

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Brems temperature contours

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Brems temperature fixed or free
· Fit again, this time keeping the Brems. component fixed and look at c-stat (frozen - red)

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Normalisation ratios ­ to line 1 and 2

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Normalisation ratios, to line 1

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Observed energy

Al

Mn

ADC
XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006


Analysis ­ stage 2 - obsolete
· Apply the best models found to MOS data · Freeze phabs and Brems. · Concentrate on certain lines, selected to cover a range of energies
Selection 1 2 3 RGS line (~keV) 0.432 0.801 1.023 Range studied (keV) 0.40 ­ 0.57 0.65 ­ 0.92 0.92 ­ 1.25

XMM EPIC MOS

Jenny Carter (jac48@star.le.ac.uk) EPIC Calibration Mallorca, 26th-27th Oct. 2006