Computer Science – Performance
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546301k&link_type=abstract
American Astronomical Society, AAS Meeting #215, #463.01; Bulletin of the American Astronomical Society, Vol. 42, p.494
Computer Science
Performance
Scientific paper
The Wide Field Camera 3 (WFC3) is fitted with three grisms for slitless spectroscopy. In the UVIS channel there is one grism, G280, for the near-UV to visible range (200 - 400nm). The IR channel has two grisms: G102 for the shorter (800-1150nm) and G141 for the longer (1100-1700nm) NIR wavelengths. Using SMOV and Cycle 17 data taken on Planetary Nebulae and flux standard stars, we have assessed the performance of all three grisms. We have measured the trace locations and dispersion solutions and determined the throughputs. Besides the most sensitive first orders, also higher spectral orders were included in the analysis. The trace and wavelength solutions for the IR grisms were found to be linear functions, varying smoothly as a function of field of view. Generally, there is good agreement with the calibration solutions derived during the ground calibrations performed in the thermal-vacuum campaigns 2 and 3. The maximum throughputs for the G102 and G141 grisms are 41.8% at 1100nm and 46.8% at 1450nm, respectively. For the IR grisms, we give aperture corrections as a function of wavelength and show the cross-dispersion PSF, which agrees well with design expectations as well as ground calibration measurements. The results are published as sensitivity files and configuration files that can be used with the dedicated extraction software aXe to reduce WFC3 slitless data.
Bushouse Howard
Kuemmel Martin
Kuntschner Harald
Walsh Jonathan R.
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