In-Orbit Performance of the Hard X-Ray Detector on Board Suzaku
Isobe, Naoki; Enoto, Teruaki; Yamaoka, Kazutaka; Fukazawa, Yasushi; Hong, Soojing; Kokubun, Motohide; Makishima, Kazuo; Murakami, Toshio; Nakazawa, Kazuhiro; Ohno, Masanori; Onda, Kaori; Sato, Goro; Sugita, Satoshi; Suzuki, Masanobu; Takahashi, Tadayuki; Takahashi, Takuya; Terada, Yukikatsu; Takahashi, Hiromitsu; Kawaharada, Madoka; Kitaguchi, Takao; Kawano, Naomi; Mitani, Takefumi; Kubota, Aya; Tanaka, Takaaki; Itoh, Takeshi; Yonetoku, Daisuke; Mizuno, Tsunefumi; Odaka, Hirokazu; Tamagawa, Toru; Watanabe, Shin; Yamada, Shinya; Madejski, Greg M.; Tashiro, Makoto; Yuasa, Takayuki; Kamae, Tuneyoshi; Takahashi, Isao; Murashima, Mio; Suzuki, Masaya; Abe, Keiichi; Miyawaki, Ryouhei; Yanagida, Takayuki; Ohnuki, Kousuke; Tamura, Ken-Ichi; Endo, Yasuhiko; Hirakuri, Shinya; Hiruta, Tatsuro; Kishishita, Tetsuichi; Takeda, Shin'ichiro; Hirasawa, Ayumi; Katsuta, Jun'ichiro; Matsumura, Satoshi; Sato, Mitsuhiro; Ushio, Masayoshi; Ishikawa, Shin-Nosuke; Murase, Koichi; Yaji, Yuichi; Yamasaki, Tomonori; Hxd Team
Japan, United States
Abstract
The in-orbit performance and calibration of the Hard X-ray Detector (HXD) on board the X-ray astronomy satellite Suzaku are described. Its basic performances, including a wide energy bandpass of 10-600keV, energy resolutions of ∼4keV (FWHM) at 40keV and ∼11% at 511keV, and a high background rejection efficiency, have been confirmed by extensive in-orbit calibrations. The long-term gains of PIN-Si diodes have been stable within 1% for half a year, and those of scintillators have decreased by 5-20%. The residual non-X-ray background of the HXD is the lowest among past non-imaging hard X-ray instruments in energy ranges of 15-70 and 150-500keV. We provide accurate calibrations of energy responses, angular responses, timing accuracy of the HXD, and relative normalizations to the X-ray CCD cameras using multiple observations of the Crab Nebula.