Computer Science – Performance
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009nicm.rept...17k&link_type=abstract
ST-ECF Instrument Science Report WFC3-2009-17, 29 pages
Computer Science
Performance
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
Based on the SMOV observations, the performance of the WFC3 near-IR grism G141 has been assessed. The location of the +1st spectral order relative to the source positions in the direct imaging filters F140W and F160W are determined, field dependent trace and wavelength solutions are derived, and the absolute throughput is quantified. Similar information is derived for higher spectral orders and the -1st order. The trace and wavelength solutions were found to be linear functions, varying smoothly over the field of view. Generally, there is good agreement (<= 1 pixel) with the calibration solutions derived during the ground calibrations in TV2 and TV3. For the +1st order aperture corrections are provided as a function of wavelength. The cross-dispersion PSF is evaluated and agrees with the design expectations as well as ground calibration measurements. All calibrations in this ISR are given with respect to source positions derived from F140W images. Source positions obtained from F160W images show only a small systematic offset relative to F140W images of ΔX=0.057±0.003 and ΔY=-0.045± 0.004. The +1st order of the G141 grism shows a mean dispersion of 46.5 Å/pixel with a resolving power of R~120 at 13000 Å. The throughput of HST + WFC3 G141 peaks at 14350 Å with 47.8% and is above 10% between 10800 and 16900 Å.
Bushouse Howard
Kümmel Martin
Kuntschner Harald
Walsh Jonathan R.
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