A self charge filling (SCF) effect of Suzaku-XIS

In general, the charge transfer efficiency (CTE) of CCD gradually degrades due to multiplication of charge traps made by cosmic-rays. The Suzaku-XIS is also suffered this degradation. In order to restore it, the spaced-row charge injection (SCI) has been used since October 2006, where injected charges fill the traps and charges of interesting are not trapped. A similar effect should happen during observation of bright sources. Around the image center of a bright source, we can find several pixels filled by charges in a certain raw. Since the leading pixel fills a trap, the following pixels do not suffer the charge trapping. Thus we can expect same effect to that of the SCI, and we call this a Self Charge Filling (SCF) effect. We propose a correction method of the SCF effect and show its validity by applying it for extraction of the spectra of Cygnus X-3.