Application of Model Derived Charge Transfer Inefficiency Corrections to STIS Spectroscopic CCD Data
نویسنده
چکیده
The ST-ECF 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 spectroscopic data. 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, because only the simulation properly accounts for the charge distribution in the array.
منابع مشابه
STIS Model Based Charge Transfer Inefficiency Correction
The STE-CF 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 that is able to correct STIS data for charge transfer inefficiency (CTI). The model itself is described in some detail in earlier ISRs....
متن کاملSTIS Calibration Enhancement: Wavelength Calibration and CTI
The Instrument Physical Modeling Group in the Space Telescope European Co-ordinating Facility has undertaken to examine aspects of STIS calibration and develop physical model based solutions where appropriate. Here we discuss two such aspects and the status of the model based solutions. The first concerns the derivation of dispersion solutions for the echelle spectroscopy modes. The second corr...
متن کاملINSTITUTE Instrument Science Report STIS 2009 - 02 STIS CCD Performance after SM 4 : Read Noise , Dark Current , Hot Pixel Annealing , CTE , Gain , and Spectroscopic Sensitivity
We describe the overall performance of the STIS CCD after HST Servicing Mission #4 and the associated updates to calibration reference files. Most aspects of CCD performance are found to be fairly consistent with extrapolations of the trends seen prior to the failure of STIS in August 2004. The CCD gain value for the CCDGAIN = 4 setting has been redetermined using net count ratios of standard s...
متن کاملFull-Field Sensitivity of STIS CCD Imaging and its Temporal Dependence
Using calibration data obtained during 1997-2002, a study of the full-field sensitivity of the STIS CCD in clear (50CCD) imaging mode is carried out. Throughputs measured for several stars in deep exposures of a sparse field in the globular cluster ω Cen (= NGC 5139) show a negligible temporal variation of the order of 1% in sensitivity over the past five years. This does not depend on the brig...
متن کاملThe Stis Ccd Cross-dispersion Point Spread Function
This report to outlines the work done by the Eta Carinae HST Treasury Project to determine the properties of the cross-dispersion point spread function for the HST Space Telescope Imaging Spectrograph (STIS) CCD. In this document we will refer to the cross-dispersion point spread function by the abbreviation: XSF. The goal of this work is to give a model for the STIS/CCD XSF which can be calcul...
متن کامل