Application of Model Derived Charge Transfer Inefficiency Corrections to STIS Photometric CCD Data

The STECF Calibration Enhancement effort for the Space Telescope Imaging Spectrograph (STIS) aims to improve data calibration via the application of physical modelling techniques. As part of this effort we have developed a model of the STIS CCD readout process. The model itself is described in some detail in earlier ISRs. Here we consider the application to STIS photometric data. We demonstrate that this approach can successfully remove the trails typically seen in CTE affected data and go on to ask whether this charge is being restored to the cores of detected objects in the correct quantities. We find good agreement between the simulation derived corrections and empirical corrections for a range of background and source levels. Moreover we find that, where the two differ, it is because only the simulation properly accounts for the charge distribution in the array.