Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61s...9u&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.61, No.SP1, pp.S9--S15
Astronomy and Astrophysics
Astronomy
30
Instrumentation: Detectors, Techniques: Spectroscopic, X-Ray Ccds
Scientific paper
The charge transfer inefficiency (CTI) of the X-ray CCDs aboard the Suzaku satellite (X-ray Imaging Spectrometers: XIS) has increased since the launch due to radiation damage, and the energy resolution has been degraded. To improve the CTI, we have applied a spaced-row charge injection (SCI) technique to the XIS in orbit; by injecting charges into CCD rows periodically, the CTI is actively decreased. The CTI in the SCI mode depends on the distance between a signal charge and a preceding injected row, and the pulse height shows periodic positional variations. Using in-flight data of onboard calibration sources and of the strong iron line from the Perseus cluster of galaxies, we studied the variation in detail. We developed a new method to correct the variation. By applying the new method, the energy resolution (FWHM) at 5.9keV in 2008 March is ˜155eV for the front-illuminated CCDs and ˜175eV for the back-illuminated CCD.
Bamba Aya
Bautz Marshall
Dotani Tadayasu
Go Tsuru Takeshi
Hayashida Kiyoshi
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