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Cross-Calibration between XMM-Newton and Chandra Herman L. Marshall Chandra X-ray Center, MIT Kavli Institute.

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Presentation on theme: "Cross-Calibration between XMM-Newton and Chandra Herman L. Marshall Chandra X-ray Center, MIT Kavli Institute."— Presentation transcript:

1 Cross-Calibration between XMM-Newton and Chandra Herman L. Marshall Chandra X-ray Center, MIT Kavli Institute

2 CUC Apr. 5, 2006HLM — XMM/Chandra 2 Overview XMM/Chandra Cross-calibration telecons: continuing monthly meetings formed web pages comparing fits Began effort to cross-cal formally Goal: achieve  2 = 1 for all cal sources prototyping methodology continues Attending meetings for joint cal discussions next EPIC cal meeting in May (Munich) multi-observatory cross-cal meeting in June (Reykjavik) Implementing cross-cal with Suzaku in May

3 CUC Apr. 5, 2006HLM — XMM/Chandra 3 XMM/Chandra Blazar Observations to Date From http://space.mit.edu/ASC/calib/crosscal/http://space.mit.edu/ASC/calib/crosscal/

4 CUC Apr. 5, 2006HLM — XMM/Chandra 4 From XMM team: XMM-SOC-CAL-TN-0052 (Stuhlinger et al. 2006)

5 CUC Apr. 5, 2006HLM — XMM/Chandra 5 From XMM team: XMM-SOC-CAL-TN-0052 (Stuhlinger et al. 2006)

6 CUC Apr. 5, 2006HLM — XMM/Chandra 6 Comparing XMM and Chandra XMM web pages Fit results internal for now data page: http://xmm.esac.esa.int/~xmmdoc/EPIC_C ROSSCAL/sat_cross_cal.php http://xmm.esac.esa.int/~xmmdoc/EPIC_C ROSSCAL/sat_cross_cal.php XMM report: XMM-SOC-CAL-TN-0052 (Stuhlinger et al. 2006) CXC web page: http://space.mit.edu/ASC/calib/crosscal/ http://space.mit.edu/ASC/calib/crosscal/ XMM whiteboard used for some reports Results agree generally but not within errors

7 CUC Apr. 5, 2006HLM — XMM/Chandra 7 Sample XMM-Chandra Comparison (XMM side) From http://xmm.esac.esa.int/~xmmdoc/EPIC_CROSSCAL/cross_cal_data.phphttp://xmm.esac.esa.int/~xmmdoc/EPIC_CROSSCAL/cross_cal_data.php Comparing indices is difficult

8 CUC Apr. 5, 2006HLM — XMM/Chandra 8 Sample XMM-Chandra Comparison (HETGS side) From http://space.mit.edu/ASC/calib/crosscal/http://space.mit.edu/ASC/calib/crosscal/

9 CUC Apr. 5, 2006HLM — XMM/Chandra 9 Sample XMM-Chandra Comparison (HETGS side) From http://space.mit.edu/ASC/calib/heg_meg/meg_heg_report.pdf

10 CUC Apr. 5, 2006HLM — XMM/Chandra 10 Caveats: XMM-Chandra Comparison (HETGS side) Variability: affects one observation of PKS 2155-304 (but not 1H 1426+428 and 3C 273) Different models used by ESAC and CXC broken PL vs. smooth PL HETGS fits without 2PL Residuals: compare for complete story Bow-tie: models extrapolated to low SNR Have not achieved  2 = 1 for bright sources

11 CUC Apr. 5, 2006HLM — XMM/Chandra 11 Formalizing Cross-Calibration Goal: achieve  2 / = 1 for all cal sources Premise: Users want  2 / = 1 if model fits Local adjustments, A jn g(x;  j ) -- ---> overdetermined system, reducing  2 A jn depend on instrument n,  j fixed Compare instruments by comparing A jn Method proposed: Lagrange multipliers Minimize where

12 CUC Apr. 5, 2006HLM — XMM/Chandra 12 Test cases Mk 421: bright, 100 ks XTE J1118+480: bright 24 ks g(x) = Gaussian,  = 2Å, 2Å apart, starting at 1Å Results OK amplitudes (figure) min  2 / separately: 2.20, 1.14 jointly: 2.62, 1.48 Conclusions Need more Gaussians or different basis functions or adaptive functions... Formalizing Cross-Calibration

13 CUC Apr. 5, 2006HLM — XMM/Chandra 13 Work in Progress Joint web page population Coordinate modeling between projects Process all Chandra cal data uniformly Will add analysis of 1E 0102-72 Developing joint analysis methodology Primary goals may not be achievable soon Must define secondary goals Setting up cross-cal with XMM and Suzaku Target: PKS 2155-304 Week of May 2, 2006 Will use LETG/HRC Chandra grating observations of PKS 2155 Aug ‘06 — independent of XMM, Suzaku To be used for Chandra internal cross-cal

14 CUC Apr. 5, 2006HLM — XMM/Chandra 14 Overview Formed web pages comparing fits General but not statistical agreement Results need revision and analysis Prototyping formal cross-cal methodology Attending meetings for joint cal discussions Improves approach to data handling Refines analysis and methodology Implementing cross-cal with Suzaku in May

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