1. WFC3 SOC, October 04, 2007 WFC3 Grisms Results from TV2 2D Simulations Harald Kuntschner, Jeremy Walsh, Martin Kümmel ST-ECF

2. WFC3 SOC, October 04, 2007 Overview

3. WFC3 SOC, October 04, 2007 WFC3-IR G102 direct image 0th order1st order2nd order 1014 pixel (full size) detector defects Combined white light + direct image

4. WFC3 SOC, October 04, 2007 WFC3-IR G141 direct image 0th order1st order2nd order 1014 pixel (full size) detector defects 3rd order Combined white light + direct image

5. WFC3 SOC, October 04, 2007 WFC3-UV G280 Direct image 0th order 1st order -1st order 4096 pixel (full size) Combined white light + direct image

6. WFC3 SOC, October 04, 2007 WFC3-UV G280 0th order +1st -1st 4096 pixel (full size) +2st -2st Combined monochromator steps

7. WFC3 SOC, October 04, 2007 WFC3-UV G280 +1 +2 +8 to -8 orders visible Heavy order overlap for > +2 order Order overlap in y- direction between +1st and +2nd beyond ~380nm +3 +4 +5 +8 +7 +6 0 -2 -3 -4 -5 -6 -7 -8

8. WFC3 SOC, October 04, 2007 WFC3-IR G102 Throughput 1st order –Peak efficiency of ~30% at 960 - 1120nm –Good sensitivity range: 840 - 1140nm 2nd order –Efficiency < 5% 0th order –Efficiency < 1.5%

9. WFC3 SOC, October 04, 2007 WFC3-IR G102 aperture corrections Aperture corrections are largely wavelength independent 95% flux within ~10 pixel aperture

10. WFC3 SOC, October 04, 2007 WFC3-IR G141 Throughput 1st order –Peak efficiency of ~40% at 1420 - 1640nm –Good sensitivity range: 1120 - 1660nm 2nd order –Efficiency < 6% 0th order –Efficiency < 1.5%

11. WFC3 SOC, October 04, 2007 WFC3-IR G141 aperture corrections Aperture corrections are largely wavelength independent 95% flux within ~12 pixel aperture

12. WFC3 SOC, October 04, 2007 WFC3-UV G280 Throughput 1st order –Peak efficiency of 24% at 240nm –Good sensitivity range: 200 - 330nm 2nd order –Efficiency < 2% 0th order –Efficiency equal to first order at 330nm and rising!

13. WFC3 SOC, October 04, 2007 WFC3-UV G280 Throughput Higher order efficiencies are at the ~0.1% level

14. WFC3 SOC, October 04, 2007 WFC3-IR G141 trace Linear trace solutions with rms < 0.05 pixel f(X-Xref) = 0.0074 * (X-Xref) + 1.1

15. WFC3 SOC, October 04, 2007 WFC3-IR G141 2-dim trace solution central trace: f(X-Xref) = 0.0074 * (X-Xref) + 1.1 Offset = f(X,Y) rms < 0.2 pixel Slope = f(X,Y)

16. WFC3 SOC, October 04, 2007 WFC3-IR G141 dispersion Linear dispersion solutions with rms < 1 Å f(X) [Å] = 46.9 * (X) + 8950 *Data points omitted in fit due to wavelength shift caused by steep sensitivity decline

17. WFC3 SOC, October 04, 2007 WFC3-IR G141 2-dim dispersion solution central dispersion solution: f(X’) [Å] = 46.9 * (X’) + 8950 Offset = f(X,Y) units=Å rms < 0.1 pixel Dispersion = f(X,Y) units=Å

18. WFC3 SOC, October 04, 2007 WFC3-IR G102 2-dim disp solution central dispersion solution: f(X) [Å] = 24.6 * (X) + 6376 Offset = f(X’,Y’) units=Å rms < 0.1 pixel Dispersion = f(X’,Y’) units=Å

19. WFC3 SOC, October 04, 2007 WFC3-IR PSF Gaussian FWHM = 2.3 pixel Moffat FWHM = 1.9 pixel; beta=1.08 Gaussian FWHM = 2.7 pixel Moffat FWHM = 2.3 pixel; beta=1.14 Moffat Gaussian

20. WFC3 SOC, October 04, 2007 WFC3-UV PSF Gaussian FWHM = 3.4 pixel Moffat FWHM = 2.9 pixel; beta=1.4 Gaussian FWHM = 3.8 pixel Moffat FWHM = 3.3 pixel; beta=1.5 Moffat Gaussian 230-260 nm 300-400 nm

21. WFC3 SOC, October 04, 2007 WFC3-UV G280 Trace +2 order+1 order-1 order 5 th order polynomial fits 200nm 530nm 200nm 530nm

22. WFC3 SOC, October 04, 2007 WFC3-UV G280 dispersion +1 order 1st order polynomial fit to visualize the dispersion function 4th order polynomial needed to achieve good fit (rms ~ 0.15 pixel) ~13 Å per pixel