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Chandra Calibration Status

Chandra Calibration Status. CUC Meeting Oct. 10, 2012. Timetable for detector QE and gain updates Calibration updates since the 2011 CUC meeting Cross-calibration results On-going calibration activities Calibration plans for the upcoming year. Chandra Calibration Status.

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Chandra Calibration Status

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  1. Chandra Calibration Status CUC Meeting Oct. 10, 2012

  2. Timetable for detector QE and gain updates • Calibration updates since the 2011 CUC meeting • Cross-calibration results • On-going calibration activities • Calibration plans for the upcoming year Chandra Calibration Status

  3. Timetable for Detector Gain and QE Updates

  4. Calibration products released over the past year ACIS • An updated ACIS contamination model (CALDB 4.4.1 - May 30, 2012) • Time-dependent gain corrections for epochs 47-50 ( Aug 2011 – July 2012) HRC • HRC-I gain map for 2011 (CALDB 4.4.7 - Dec. 15, 2011) • HRC background spectra for 2011 (CALDB 4.4.7 – Dec. 15, 2011) • Updated low energy HRC-S QE (CALDB 4.4.7 – Dec. 15, 2011) • Updated HRC-I and HRC-S de-gap maps (CALDB 4.5.0 – Jun. 6, 2012) • HRC-S gain map for new HV setting (CALDB 4.5.1 – Jul. 24, 2012) HETG • Updated HEG and MEG first order transmission efficiencies (CALDB 4.4.6.1 – Dec. 1, 2012)

  5. Updated time-dependence ACIS Contamination Model N007 t (700 eV) Black data points are ECS measurements and red and blue data points are ACIS-I and ACIS-S observations of A1795

  6. Updated spatial distribution model ACIS Contamination Model N007 D t (center to edge)

  7. Cross-calibration with E0102 O VII O VIII Ne IX Ne X

  8. Simultaneous fit to 30 blazars MEG and HEG first order transmission efficiency

  9. HEG/MEG first order transmission efficiency (Capella) Old CALDB Current CALDB Current CALDB Old CALDB

  10. July 2012 observations of Mkn 421 HETG/ACIS-S LETG/ACIS-S

  11. Planned AO-14 Calibration Observations

  12. Adjustment to low energy HRC-S QE Fits to co-added HZ spectra QE adjustment was based on the latest non-LTE pure H model atmospheres for HZ43 and Sirius B from the Tubingen group

  13. LETG/HRC-S Zeroth Order Image Distortion 0.625” radius circle CRSV98+99 CRSV100

  14. Updated HRC-S De-Gap Map

  15. Current Calibration Projects LETG/HRC-S observations of HZ43 over the course of the mission New HV New HV

  16. HRC-S High Voltage Test - Jan. 2012 LETG/HRC-S observations of HZ43

  17. Current Calibration Projects LETG/HRC-S observations of HZ43 over the course of the mission New HV New HV

  18. LETG/HRC-S observations of Mkn 421 with old and new HV settings

  19. LETG/HRC-S observations of Mkn 421 with old and new HV settings

  20. New Time-Dependent ACIS QE Maps ACIS-I3 ACIS-S3

  21. Stability of HRC-I QE HZ43 G21.5-09 2.6 ± 0.8 % yr-1

  22. Gain Calibration – ACIS-S1

  23. ACIS Background

  24. SAOTrace New Features – New Scattering Model 10’

  25. Summary of Present Calibration Activities Short term: • Release HRC-S QE for new HV setting • Release updated gain tables and OSIP files for ACIS BI chips • Release a set of time-dependent ACIS QE maps • Release Epoch F ACIS blank sky background images Longer term: ACIS • Continue to improve the contamination model • How variable is the charged particle background spectrum • Further cross-calibration studies

  26. HRC • Improve the calibration of the intrinsic spatial response of the HRC (e.g., (two gaussians plus a Lorentzian) • Monitor the decline in the gain and QE of the HRC-I and determine if a time-dependent QE is required • Further cross-calibration studies • Update HRC-I QE map HETG • Develop a science thread for the analysis of HETG/ACIS-S CC-mode data

  27. LETG • Revisit cross-calibration between LETG and HETG at short wavelengths with the new HEG and MEG first order efficiencies. • Revisit C-K fine edge structure using new absorption coefficients for ISM C-K edges • Improve LETG/HRC-S EE fractions (i.e., the fraction of all events extracted in the cross-dispersion direction) • Improve the calibration of the LETGS resolving power

  28. Comparision of optial depth at 700 eV derived from imaging and gratings data ECS and A1795 LETG/ACIS-S

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