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The New WFC3 Photometric Calibration

Outline 1.) Step 1 – TV3 Calibration 2.) Step 2 – SMOV4 (+ Cycle 17 Calibration) 3.) Step 3 – Final Calibration (present analysis) - More data - New flat fields - Astrodrizzle - Precise calibration. The New WFC3 Photometric Calibration.

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The New WFC3 Photometric Calibration

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  1. Outline 1.) Step 1 – TV3 Calibration 2.) Step 2 – SMOV4 (+ Cycle 17 Calibration) 3.) Step 3 – Final Calibration (present analysis) - More data - New flat fields - Astrodrizzle - Precise calibration The New WFC3 Photometric Calibration Apr 19th, 2012 TIPS Meeting

  2. The New WFC3 Photometric Calibration Thermal Vacuum 3 (TV3) - Calibrated lab response of components from GSFC, DCL, Ball. - CASTLE aperture photometry. Components 1.) The HST OTA 2.) Pickoff mirror 3.) CSM 4.) Mirror reflectivity 5.) Filter throughputs 6.) Detector window 7.) Detector QE Results folded into the detector QE (for UVIS) and a “fudge” factor for IR T. Brown (WFC3-ISR-2008-48) T. Brown (WFC3-ISR-2008-09)

  3. SMOV4 + Cycle 17 Calibration – UVIS and IR 1.) Observations of HST spectrophotometric standards: SMOV: GD153 in 37 UVIS filters; GD153 and P330E in all 15 IR filters Cycle 17: All filters, GD153, G191B2B, GD71, P330E - 1% absolute accuracy in medium and broadband filters. - 2-3% absolute accuracy in narrow band filters. 2.) Repeatability: Measure photometry stability, both temporal and spatial. High S/N subarray imaging, multiple dither positions. The New WFC3 Photometric Calibration J. Kalirai (WFC3-ISR-2009-05) R. Bohlin et al. (2011, AJ, 141, 173)

  4. The New WFC3 Photometric Calibration The Strategy

  5. UVIS: 5-10% boost in efficiency at blue/red ’s, 15-20% at 400-700 nm IR: 10-15% boost in efficiency at all ’s The New WFC3 Photometric Calibration Results (SMOV) Ooops, but this is great! J. Kalirai (WFC3-ISR-2009-30) J. Kalirai (WFC3-ISR-2009-31)

  6. The New WFC3 Photometric Calibration First New Calibration (Cycle 17)

  7. The New WFC3 Photometric Calibration The Current Calibration

  8. The New WFC3 Photometric Calibration Two Independent Tests Suggest Issues with the Flat Field - Relative photometry across the detector reveals residual gradient. Large campaign to fix this over the past two years

  9. The New WFC3 Photometric Calibration Step 3 – Final Calibration (present analysis) - New flat fields - Astrodrizzle - More data - Reprocess all SMOV, Cycle 17, Cycle 18 data - Images: 2080 (GD153), 1260 (P330E), 1134 (G191B2B), 610 images (GD71) - 2220 images of GRW+70 - Precise calibration

  10. The New WFC3 Photometric Calibration Step 3 – Final Calibration (present analysis) A. Rajan: Astrodrizzle image of F606W (42 GD153 images)

  11. The New WFC3 Photometric Calibration Step 3 – Final Calibration (present analysis)

  12. The New WFC3 Photometric Calibration Step 3 – Final Calibration (present analysis)

  13. The New WFC3 Photometric Calibration Step 3 – Final Calibration (present analysis) Delivery Details - New filter transmission tables (updated history, fudge factor, pedigree, etc..) - Tables of the fractional change in ZP - Tables with the counts in 13 apertures in all filters for all stars - New photometric zero points - Everything is ingested into CDBS

  14. The New WFC3 Photometric Calibration Extra Slides

  15. The New WFC3 Photometric Calibration Results - Temporal stability also looks good (~0.5%) J. Kalirai (WFC3-ISR-2010-14) J. Kalirai (WFC3-ISR-2011-08)

  16. The New WFC3 Photometric Calibration 7 weeks ago - New Keck data of all HST primary spectrophotometric standards

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