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2005 HST Calibration Workshop – 26 October 2005

Towards a Comprehensive Sensitivity Calibration for the STIS Echelle Modes. Alessandra Aloisi (ESA/STScI). • Description of the issues involved • Data analysis and results • Pipeline tools implemented for corrections • What still remains to be done.

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2005 HST Calibration Workshop – 26 October 2005

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  1. Towards a Comprehensive Sensitivity Calibration for the STIS Echelle Modes Alessandra Aloisi (ESA/STScI) • Description of the issues involved • Data analysis and results • Pipeline tools implemented for corrections • What still remains to be done 2005 HST Calibration Workshop – 26 October 2005 1

  2. Outstanding Issues • Updated Absolute Flux Calibration for Primary Settings • Time Dependent Sensitivity Counts vs. t • Blaze Function Characterization Shifts vs. location (x,y) & t Shape vs. location (x,y) & t • Flux Calibration for Secondary Settings 2005 HST Calibration Workshop – 26 October 2005 2

  3. Updated Absolute Flux Calibrationfor Primary Settings • 2D algorithm for Scattered Light implemented into the pipeline Lindler & Bowers (2002) CALSTIS 2.9 (Dec. 2000) F uncertainty < 2% (absorption lines) ISR STIS 02-01 2005 HST Calibration Workshop – 26 October 2005 3

  4. Updated Absolute Flux Calibrationfor Primary Settings • Re-determination of Echelle flux calibration for self-consistency no changes for SL  2-7 % due to other • New PHT files delivered to the pipeline  Apr. 2005  BZS & TDS backed out F uncertainty < few% FOS old PHT file new PHT file 1997.7 2005 HST Calibration Workshop – 26 October 2005 4

  5. Time Dependent Sensitivity (TDS) • Sensitivity of MAMAs decreases with time (contaminants) F errors < 15% 1997.7 2000.9 2004.0 2005 HST Calibration Workshop – 26 October 2005 5

  6. Time Dependent Sensitivity (TDS) • Analysis of Spectra with same MO & different t = BD+28D4211 MO = (0,0) t = 1997.7–2004 Primary SettingsE140H (1416) E140M (1425) E230H (2263) E230M (1978, 2707)  Results *Similar trend as first order modes 2005 HST Calibration Workshop – 26 October 2005 6

  7. Time Dependent Sensitivity (TDS) • Analysis of Spectra with same MO & different t = BD+28D4211 MO = (0,0) t = 1997.7–2004 Primary SettingsE140H (1416) E140M (1425) E230H (2263) E230M (1978, 2707)  Results *Similar trend as first order modes G140L E140M (1425) 2005 HST Calibration Workshop – 26 October 2005 6

  8. Time Dependent Sensitivity (TDS) • Analysis of Spectra with same MO & different t = BD+28D4211 MO = (0,0) t = 1997.7–2004 Primary SettingsE140H (1416) E140M (1425) E230H (2263) E230M (1978, 2707)  Results *Similar trend as first order modes * Some scatter due to: temperature ? miscentering in small aperture ? BF with t ? 2005 HST Calibration Workshop – 26 October 2005 6

  9. Time Dependent Sensitivity (TDS) • TDS correction from first-order modes • New TDS files delivered to the pipeline Apr. 2005  F uncertainty < few % FOS no TDS correction TDS correction 2004.0 2005 HST Calibration Workshop – 26 October 2005 7

  10. Blaze Function (BF) • BF leads to ripples in calibrated spectra saw-tooth F calibration errors < 20% 1998 2005 HST Calibration Workshop – 26 October 2005 8

  11. Blaze Function (BF) • BF leads to ripples in calibrated spectra saw-tooth F calibration errors < 20% 2000.4 2005 HST Calibration Workshop – 26 October 2005 8

  12. Blaze Function (BF) • BF leads to ripples in calibrated spectra saw-tooth F calibration errors < 20% 2003.4 2005 HST Calibration Workshop – 26 October 2005 8

  13. BF Variations • Changes with time (contaminants & optics) & location on the detector (MOs)  What type of changes ? * BF Shift * BF Shape  What causes the changes ? * Effects due to location (x,y) * Effects due to time (t) 2005 HST Calibration Workshop – 26 October 2005 9

  14. BF Shift • MO produces BF shift • Algorithm already implemented into pipeline Bowers & Lindler (2002) 2005 HST Calibration Workshop – 26 October 2005 10

  15. BF Shift • MO produces BF shift • Algorithm already implemented into pipeline Bowers & Lindler (2002) 2005 HST Calibration Workshop – 26 October 2005 10

  16. BF Shift • MO produces BF shift • Algorithm already implemented into pipeline Bowers & Lindler (2002) 2 Parameter Model BLZSHIFT = A∗Δx + B∗Δy 2005 HST Calibration Workshop – 26 October 2005 10

  17. BF Shift • MO produces BF shift • Algorithm already implemented into pipeline Bowers & Lindler (2002) 2 Parameter Model BLZSHIFT = A∗Δx + B∗Δy Residuals vs. t 2005 HST Calibration Workshop – 26 October 2005 10

  18. BF Shift • MO produces BF shift • Algorithm already implemented into pipeline Bowers & Lindler (2002) 2 Parameter Model BLZSHIFT = A∗Δx + B∗Δy Residuals vs. t 3 Parameter Model BLZSHIFT = A∗Δx+B∗Δy+C∗t 2005 HST Calibration Workshop – 26 October 2005 10

  19. BF Shift • MO produces BF shift • Algorithm already implemented into pipeline Bowers & Lindler (2002)  CALSTIS 2.13b (Sep. 2002)  BLZSHIFT = A ∗Δx + B ∗Δy + C ∗ t Δx & Δy from wavecals A, B, & C from fit of data (1997-2001) • MO switched off in Aug 2002 2005 HST Calibration Workshop – 26 October 2005 10

  20. BF with Time • Analysis of Spectra with same MO & different t Same datasets used for TDS 2005 HST Calibration Workshop – 26 October 2005 11

  21. BF with Time • Analysis of Spectra with same MO & different t Same datasets used for TDS E140M (1425) – order 95 2005 HST Calibration Workshop – 26 October 2005 11

  22. BF with Time • Analysis of Spectra with same MO & different t Same datasets used for TDS  Results * No change in BF shape with time * BF shift linear (?) with order 2005 HST Calibration Workshop – 26 October 2005 11

  23. BF with Time • Analysis of Spectra with same MO & different t Same datasets used for TDS  Results * No change in BF shape with time * BF shift linear (?) with order E230H (2263) 2005 HST Calibration Workshop – 26 October 2005 11

  24. BF with Time • Analysis of Spectra with same MO & different t Same datasets used for TDS  Results * No change in BF shape with time * BF shift linear (?) with order * Slope and normalization linear with t for E140H, E140M & E230H but large differences at latest t average BF shift not correct 2005 HST Calibration Workshop – 26 October 2005 11

  25. BF with Time • Analysis of Spectra with same MO & different t Same datasets used for TDS  Results * No change in BF shape with time * BF shift linear (?) with order * Slope and normalization linear with t for E140H, E140M & E230H but large differences at latest t average BF shift not correct E140M (1425) 2005 HST Calibration Workshop – 26 October 2005 11

  26. BF with Time • Analysis of Spectra with same MO & different t Same datasets used for TDS  Results * No change in BF shape with time * BF shift linear (?) with order * Slope and normalization linear with t for E140H, E140M & E230H but large differences at latest t average BF shift not correct * Normalization non monotonic with t for E230M linear extrapolation of pipeline wrong 2005 HST Calibration Workshop – 26 October 2005 11

  27. BF with Time • Analysis of Spectra with same MO & different t Same datasets used for TDS  Results * No change in BF shape with time * BF shift linear (?) with order * Slope and normalization linear with t for E140H, E140M & E230H but large differences at latest t average BF shift not correct * Normalization non monotonic with t for E230M linear extrapolation of pipeline wrong E230M (1978) 2005 HST Calibration Workshop – 26 October 2005 11

  28. BF with Time • Analysis of Spectra with same MO & different t Same datasets used for TDS  Results * No change in BF shape with time * BF shift linear (?) with order * Slope and normalization linear with t for E140H, E140M & E230H but large differences at latest t average BF shift not correct * Normalization non monotonic with t for E230M linear extrapolation of pipeline wrong * Same behavior of E230M (1978) & E230M(2707) change in grating 2005 HST Calibration Workshop – 26 October 2005 11

  29. BF with Time • Implementation of t-dependent BFS with order • New PHT files will be delivered to the pipeline  F uncertainty < few % FOS Pipeline BZS Corrected BZS 2004.4 2005 HST Calibration Workshop – 26 October 2005 12

  30. BF with Location • Analysis of Spectra with different MO & same t = BD+28D4211 5 MOs t = Jul 2002 Primary SettingE230H (2513)  Results *No change in BF shape with location * Average BF shift similar to BLZSHIFT once MO = (0,0) taken as reference * No strong dependence with the order 2005 HST Calibration Workshop – 26 October 2005 13

  31. BF with Location E230H (2513) • Analysis of Spectra with different MO & same t = BD+28D4211 5 MOs t = Jul 2002 Primary SettingE230H (2513)  Results *No change in BF shape with location * Average BF shift similar to BLZSHIFT once MO = (0,0) taken as reference * No strong dependence with the order 2005 HST Calibration Workshop – 26 October 2005 13

  32. Flux Calibration for Secondary Settings • Secondary Settings almost used as often as Primary Settings • Absolute flux calibration of Secondary Settings still based on pre-launch data • TDS but not BF shift correction applied • On-board data collected G191B2B All Primary & Secondary Settings (Sep. 2001) • Analysis to be performed 2005 HST Calibration Workshop – 26 October 2005 14

  33. Summary • Updated Absolute Flux Calibration for Primary Settings PIPELINE • Time Dependent Sensitivity PIPELINE • Blaze Function IMPLEMENTATION • Flux Calibration for Secondary Settings DATA ANALYSIS 2005 HST Calibration Workshop – 26 October 2005 15

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