Energy-Scale Calibration of the Suzaku X-Ray Imaging Spectrometer Using the Checker Flag Charge Injection Technique in Orbit

Midori Ozawa; Hideki Uchiyama; Hironori Matsumoto; Hiroshi Nakajima; Katsuji Koyama; Takeshi Go Tsuru; Masahiro Uchino; Hiroyuki Uchida; Kiyoshi Hayashida; Hiroshi Tsunemi; Hideyuki Mori; Aya Bamba; Masanobu Ozaki; Tadayasu Dotani; Takayoshi Kohmura; Yoshitaka Ishisaki; Hiroshi Murakami; Takeshi Kato; Takeshi Kitazono; Yuki Kimura; Kazuki Ogawa; Shunsuke Kawai; Koji Mori; Gregory Prigozhin; Steve Kissel; Eric Miller; Beverly LaMarr; Marshall Bautz

arXiv · 0809.3665

Energy-Scale Calibration of the Suzaku X-Ray Imaging Spectrometer Using the Checker Flag Charge Injection Technique in Orbit

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Abstract

The X-ray Imaging Spectrometer (XIS) on board the Suzaku satellite is an X-ray CCD camera system that has superior performance such as a low background, high quantum efficiency, and good energy resolution in the 0.2-12 keV band. Because of the radiation damage in orbit, however, the charge transfer inefficiency (CTI) has increased, and hence the energy scale and resolution of the XIS has been degraded since the launch of July 2005. The CCD has a charge injection structure, and the CTI of each column and the pulse-height dependence of the CTI are precisely measured by a checker flag charge injection (CFCI) technique. Our precise CTI correction improved the energy resolution from 230 eV to 190 eV at 5.9 keV in December 2006. This paper reports the CTI measurements with the CFCI experiments in orbit. Using the CFCI results, we have implemented the time-dependent energy scale and resolution to the Suzaku calibration database.

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Midori Ozawa, Hideki Uchiyama, Hironori Matsumoto, Hiroshi Nakajima, Katsuji Koyama, Takeshi Go Tsuru, Masahiro Uchino, Hiroyuki Uchida, Kiyoshi Hayashida, Hiroshi Tsunemi, Hideyuki Mori, Aya Bamba, Masanobu Ozaki, Tadayasu Dotani, Takayoshi Kohmura, Yoshitaka Ishisaki, Hiroshi Murakami, Takeshi Kato, Takeshi Kitazono, Yuki Kimura, Kazuki Ogawa, Shunsuke Kawai, Koji Mori, Gregory Prigozhin, Steve Kissel, Eric Miller, Beverly LaMarr, Marshall Bautz. 2008-09-22. Energy-Scale Calibration of the Suzaku X-Ray Imaging Spectrometer Using the Checker Flag Charge Injection Technique in Orbit. https://arxiv.org/abs/0809.3665

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