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Energy Calibration using SNRs: preliminary results

Mallorca, 6 November 2007 EPIC Calibration Meeting. Energy Calibration using SNRs: preliminary results. Andrea Tiengo INAF, IASF-Milano. EPIC calibration with SNRs. Main objective of SNR calibration observations: Monitor EPIC gain and energy resolution

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Energy Calibration using SNRs: preliminary results

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  1. Mallorca, 6 November 2007 EPIC Calibration Meeting Energy Calibration using SNRs:preliminary results Andrea Tiengo INAF, IASF-Milano

  2. EPIC calibration with SNRs Main objective of SNR calibration observations: • Monitor EPIC gain and energy resolution • Check if they vary with detector position and count rate Analysis strategy: • Extract PN, MOS1 and MOS2 SNRs spectra and response matrices with SAS v7.1(CCFs: August 2007) • Fit brightest lines in XSPEC with Gaussians (and PL continuum) Results (work in progress…): • Energies and widths of different lines of different SNRs at different times (only a few examples already done) • The same from different detector regions (to be done) A. Tiengo - Mallorca, 6 November 2007

  3. SNRs EPIC observations These are the main targets: • 1ES0102-72: 21 obs. • N132D: 31 obs. • Cas A: 10 obs. • Tycho SNR: 5 obs. Only a fraction of these observations are directly comparable: different observing modes, exposure times, off-axis and position angles… A. Tiengo - Mallorca, 6 November 2007

  4. PN spectra Si Start from bright lines in bright SNR: Si/Fe lines in Tycho (Cas A observed in different operating modes) Fe A. Tiengo - Mallorca, 6 November 2007

  5. Tycho: PN fit to Si/Fe lines <2.3 eV/yr (3) -2.40.1 eV/yr <6.3 eV/yr -131 eV/yr A. Tiengo - Mallorca, 6 November 2007

  6. PN MOS1 MOS2 Tycho: MOS1/MOS2 fit to Si line Gaussian fit to Si line in MOS gives unacceptable fits. A. Tiengo - Mallorca, 6 November 2007

  7. Tycho: MOS1/MOS2 fit to Fe line MOS1 MOS2 <1.5 eV/yr <7.4 eV/yr <3.5 eV/yr <9 eV/yr A. Tiengo - Mallorca, 6 November 2007

  8. PN spectra Si N132D: dim, but many obs. (to start, I select ~1/year) Fe A. Tiengo - Mallorca, 6 November 2007

  9. N132D: PN fit to Si/Fe lines • Incompatible with results from Tycho SNR: • Si: -2.40.1 eV/yr; Fe: -131 eV/yr • But: • N132D fit unacceptable • Tycho obs. in 2005/2006/2007 •  • Fitting only N132D obs. after 2004: • Si: -1.40.8 eV/yr; Fe: 08 eV/yr •  Consistent results in the same period (2005-2007) 1.20.2 eV/yr (2>2) 6.52.5 eV/yr A. Tiengo - Mallorca, 6 November 2007

  10. N132D: PN fit to Si/Fe lines <3 eV/yr 1.20.2 eV/yr (2>2) <15 eV/yr <14 eV/yr (3) A. Tiengo - Mallorca, 6 November 2007

  11. Conclusions From preliminary analysis (2 lines, 2 SNRs, 12 obs): • Energy resolution is stable with time • Gain is stable in MOS but has significant fluctuations in PN • No significant rate dependence Work in progress: • Complete semi-automatic analysis procedure • Extending same analysis to more (all) lines, all (4) SNRs, all (67) observations • Spatially resolved analysis (CTI) • Can this analysis be useful to improve CCFs? A. Tiengo - Mallorca, 6 November 2007

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