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Implementation of Models for Charge Transfer Inefficiency (CTI)in the Gaia Pixel-Level Data Simulator

Published online by Cambridge University Press:  15 February 2011

C. Turon ,
F. Meynadier ,
F. Arenou ,
M. Weiler ,
C. Babusiaux  and
A. Short
M. Weiler
Affiliation:
GÉPI, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France
C. Babusiaux
Affiliation:
GÉPI, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France
A. Short
Affiliation:
ESTEC, ESA, The Netherlands
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Abstract

The Gaia pixel-level data simulator GIBIS (Gaia Instrument and Basic Image Simulator,Babusiaux (2005)) provides detailed artificial data for all three instruments on-board theGaia spacecraft. This data is used for the preparation of procedures required for theanalysis of real Gaia data to come during the mission. Among the effects that stronglyaffect all Gaia data, that therefore have to be modelled with GIBIS, is charge transferinefficiency (CTI). CTI, caused by radiation-induced microscopic defects in the CCDdetectors, becomes manifest in a distortion of the line spread functions of observedobjects, as well as in a loss of photo-generated charges inside the window allocated toeach observed source. It affects the astrometric, photometric, and spectroscopic accuracyof the data. The CTI effects on a particular observation depend on observations donebefore, on CCD operations such as gate activity and charge injections, and on physicaleffects such as the sky background brightness and cosmic ray events in the detectors. Inthis paper, an approach for the simulation of CTI with GIBIS is presented and theinfluence of the sky background brightness and cosmic ray events of CTI is discussed inmore detail.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 45: GAIA: At the Frontiers of Astrometry , 2010 , pp. 67 - 72
Copyright
© EAS, EDP Sciences 2011

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References

Références

Babusiaux, C., 2005, “Gaia Instrument and Basic Image Simulator”, ESA SP, 576, 417 Google Scholar
de Bruijne, J., 2007, “Diffuse sky brightness and implications for a diffuse-optical-background source”, Gaia Livelink, GAIA-CA-TN-ESA-JDB-031
Lindegren, L., 2008, “Modelling radiation damage effects for Gaia: A first-order Charge Distortion Model (CDM-01)”, Gaia Livelink, GAIA-C3-TN-LU-LL-075
Short, A., 2008, “A Simple Analytical Model of Electron Trapping in CCDs”, Gaia Livelink, GAIA-CH-TN-ESA-AS-014
Short, A., 2009, “Charge Distortion Model 02 (CDM02)”, Gaia Livelink, GAIA-CH-TN-ESA-AS-015