Computer Science – Performance
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005wfc..rept...17l&link_type=abstract
ST-ECF Instrument Science Report WFC3-2005-17, 15 pages
Computer Science
Performance
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
The fundamental parameters of a slitless dispersing element are the geometrical configuration of the spectral orders, the dispersion relation relating pixel offset to wavelength and the sensitivity of each order. Based on ambient and thermal vacuum tests, the performance of the WFC3 UVIS G280L grism has been assessed. The locations of the different orders relative to exposures taken through a direct imaging filter are determined, wavelength solutions are derived, and the relative throughput of the different orders is quantified. The wavelength solution was found to be a nearly linear function of pixel offset for all orders and the tilt of the spectra to the pixel grid is 3 degrees, but the orders are curved. However the G280L grism shows a very high concentration of flux in the zeroth order, which only has very small spectral dispersion, and as a result the fraction of incident flux in the 1st order is only ~30% over the full wavelength range 200 nm - 500 nm. Only from 200 nm - 300 nm does the 1st order receive more flux than the 0th order.
Bushouse Howard
Larsen Soeren S.
Walsh Jonathan R.
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