Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011wfc..rept...11p&link_type=abstract
Instrument Science Report ISR WFC3-2011-11, 20 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
A significantly improved set of flat-fields are now available and are currently used as part of the WFC3 calibration pipeline. We describe the creation and testing of new in-orbit flat-field corrections for the WFC3 IR channel. While high signal to noise ground based flat-fields were generated prior to launch, photometry of dithered stellar fields showed that these flat-fields failed to fully flatten the large scale structure of the WFC3 IR flat-fields. In this ISR we show how we generated a correction to the ground based flat-fields using thousands of IR observations. This correction, or sky delta flat-field (SD-flat in this ISR), appears to be both wavelength and time independent and is stable down to better than 1% over most of the detector. Photometric accuracy using new corrected flat-fields is better than 0.5% (peak to peak variation of -1.5/+1.6%) if one avoid being within 128 pixels of the edge of the detector. For the "wagon-wheel" region and the edge of the detector, photometric accuracy is reduced to about 0.8% (peak to peak variation of -2.0/+1.9%).
Dahlen Tomas
Mack Jennifer
Pirzkal Nor
Sabbi Elena
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