Computer Science – Performance
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfc..rept....1k&link_type=abstract
ST-ECF Instrument Science Report WFC3 2009-01, 23 pages
Computer Science
Performance
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
Based on thermal vacuum tests (TV2; June - August 2007 and TV3; March/April 2008), the performance of the WFC3 UV G280 grism has been assessed. The locations of the different orders relative to exposures taken through a direct imaging filter are determined, trace and wavelength solutions are derived for a central position on each chip, and the absolute throughput of the different orders is quantified. Aperture corrections are given as a function of wavelength. Furthermore, we describe flat-field cubes that provide pixel-to-pixel information as a function of wavelength to an accuracy of about 2%. The +1st order is useful for scientific observations in the range ~190 to 500nm, however, the +2nd order spectrum is overlapping with the first order for wavelengths larger than about 390nm. For wavelengths above ~320nm, the 0th order, which shows a small dispersion, carries more power than the +1st order. Therefore, especially for red sources, the 0th order is prone to saturation effects. The trace and wavelength solutions show significant variations as a function of position within the field-of-view. However, the available ground calibrations are not sufficient to establish a full position-dependent calibration. Henceforth, the calibrations reported in this ISR can only be used to extract spectra of relatively isolated, blue targets placed at the central position on Chips 1 or 2.
Bushouse Howard
Kümmel Martin
Kuntschner Harald
Walsh Jonathan R.
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