The TV2 ground calibrations of the WFC3 NIR grisms

Details The TV2 ground calibrations of the WFC3 NIR grisms The TV2 ground calibrations of the WFC3 NIR grisms

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008wfc..rept...15k&link_type=abstract

ST-ECF Instrument Science Report WFC3-2008-15, 19 pages

Computer Science

Performance

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Thermal Vacuum Test, Tv2, Ground Calibration, Grisms

Scientific paper

Based on thermal vacuum tests (TV2; June - August 2007), the performance of the WFC3 near-IR G102 and G141 grisms 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, and the absolute throughput of the different orders is quantified. The trace and wavelength solutions were found to be linear functions varying smoothly as function of field of view. Aperture corrections are given for both grims as function of wavelength. Furthermore, we describe flat-field cubes that provide pixel-to-pixel information as function of wavelength to an accuracy of about 1%. New detectors in the UV and IR channels are being tested in TV3 (March - April 2008), therefore updates for the sensitivity calibrations are to be expected while geometric properties are predicted to remain stable.

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