English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Radiation damage to space-based Charge-Coupled Device (CCD) detectors createsdefects which result in an increasing Charge Transfer Inefficiency (CTI) thatcauses spurious image trailing. Most of the trailing can be corrected duringpost-processing, by modelling the charge trapping and moving electrons back towhere they belong. However, such correction is not perfect -- and damage iscontinuing to accumulate in orbit. To aid future development, we quantify thelimitations of current approaches, and determine where imperfect knowledge ofmodel parameters most degrade measurements of photometry and morphology. As aconcrete application, we simulate $1.5\times10^{9}$ "worst case" galaxy and$1.5\times10^{8}$ star images to test the performance of the Euclid visualinstrument detectors. There are two separable challenges: If the model used tocorrect CTI is perfectly the same as that used to add CTI, $99.68$ % ofspurious ellipticity is corrected in our setup. This is because readout noiseis not subject to CTI, but gets over-corrected during correction. Second, if weassume the first issue to be solved, knowledge of the charge trap densitywithin $\Delta\rho/\rho\!=\!(0.0272\pm0.0005)$ %, and the characteristicrelease time of the dominant species to be known within$\Delta\tau/\tau\!=\!(0.0400\pm0.0004)$ % will be required. This work presentsthe next level of definition of in-orbit CTI calibration procedures for Euclid.

How well can Charge Transfer Inefficiency be corrected? A parameter sensitivity study for iterative correction