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The Photometric Performance and Calibration of WFC3

The Photometric Performance and Calibration of WFC3. Photometry with WFC3 1.) High resolution and sensitivity 3.) Wide field of view 2.) UV, optical, and NIR coverage 4.) 77 filters + 3 grisms. High z Galaxies: Bouwens et al. (2008). Low Mass Stars:

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The Photometric Performance and Calibration of WFC3

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  1. The Photometric Performance and Calibration of WFC3 Photometry with WFC3 1.) High resolution and sensitivity 3.) Wide field of view 2.) UV, optical, and NIR coverage 4.) 77 filters + 3 grisms High z Galaxies:Bouwens et al. (2008) Low Mass Stars: Dupuy, Liu, & Ireland (2009) Cosmology: Riess et al. (2007) Resolved Stellar Pops: Richer et al. (2009) Oct 15th, 2009 TIPS-JIM Meeting, STScI

  2. SMOV4 Calibration: The Photometric Stability and Absolute Throughput of WFC3 UVIS and IR 1.) Observations of HST spectrophotometric standards: GD153 in 37 UVIS filters; GD153 and P330E in all 15 IR filters - 1% absolute accuracy in medium and broadband filters. - 2-3% absolute accuracy in narrow band filters. 2.) Repeat observations: Measure photometry stability, both temporal and spatial. High S/N subarray imaging, multiple dither positions. The Photometric Performance and Calibration of WFC3 Oct 15th, 2009 TIPS-JIM Meeting, STScI

  3. Spatial stability over 4 (small) dither positions; <1% The Photometric Performance and Calibration of WFC3 SMOV4 Calibration: The Photometric Stability and Absolute Throughput of WFC3 Temporal stability over 1 month; <0.5% Oct 15th, 2009 TIPS-JIM Meeting, STScI

  4. The WFC3 System Throughput 1.) The HST OTA 2.) Pickoff mirror 3.) CSM 4.) Mirror reflectivity 5.) Filter throughputs 6.) Detector window 7.) Detector QE Calibration Performed in TV3 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 ACS/WFC: Sirianni et al. (2002) The Photometric Performance and Calibration of WFC3 Oct 15th, 2009 TIPS-JIM Meeting, STScI

  5. 2.) WFC3 represents 50% of cycle 17 HST orbits. Stellar evolution models/isochrones already available The Photometric Performance and Calibration of WFC3 Implications 1.) WFC3 is AWESOME! 3.) vs ACS: - 20% smaller pixels - 50% lower read noise - negligible CTE correction - much lower dark current Early Science Highlights 1.) Ten WFC3 publications submitted to journals. 2.) Highest redshift galaxies in the Universe discovered. A Look Forward to Cycle 17 1.) Observations of additional flux standards. 2.) Observations in all filters. 3.) Absolute flux calibration of WDs. 4.) Photometric transformations. 5.) Color corrections and tests of filter bandpasses. For details: Kalirai et al. (2009, WFC3 ISR ---), CAL11450) Kalirai et al. (2009, WFC3 ISR ---), CAL11451) Oct 15th, 2009 TIPS-JIM Meeting, STScI

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