Mitigating Image Persistence in WFC3 NIR Observations to Allow Weak Lensing Shape Measurements

Details Mitigating Image Persistence in WFC3 NIR Observations to Allow Weak Lensing Shape Measurements Mitigating Image Persistence in WFC3 NIR Observations to Allow Weak Lensing Shape Measurements

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11769r&link_type=abstract

HST Proposal ID #11769. Cycle 17

Physics

Scientific paper

Weak gravitational lensing, the slight distortion of the shapes of background galaxies by foreground dark matter, has become an important tool in precision cosmology. With the addition of the of the near infrared {NIR} WFC3 channel later this year, there will be NIR surveys in which weak lensing will be a primary or secondary science goal. We have identified an important instrumental systematic effect, image persistence, or ghosting, that is present in HgCdTe NIR detectors such as WFC3. This effect will cause non-negligible shape distortions that mimic a weak lensing signal and prevent precise weak lensing measurements. We have outlined a mitigation strategy that entials quantifying the effect and then removing the effect from the data as the first stage in image processing. We have all the necessary tools, including two HgCdTe detectors in our labs undergoing persistence characterization, an existing image simulation pipeline, and well-tested weak lensing shape measurement software. Using science and calibration imaging data taken during the normal course of Cycle 17 operations, we will develop a model of persistence in WFC3, produce a removal algorithm, and deliver the results to STScI for dissemination to the community. We will also monitor WFC3 over the course of Cycle 17 to see if the persistence worsens due to charged particle radiation damage.;

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