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Serlemitsos, Peter J; Soong, Yang; Chan, Kai-Wing; Okajima, Takashi; Lehan, John P; Maeda, Yoshitomo; Itoh, Kei; Mori, Hideyuki; Iizuka, Ryo; Itoh, Akiharu; Inoue, Hirohiko; Okada, Shunsaku; Yokoyama, Yushi; Itoh, Yumi; Ebara, Masatoshi; Nakamura, Ryoko; Suzuki, Kensuke; Ishida, Manabu; Hayakawa, Akira; Inoue, Chiaki; Okuma, Satoshi; Kubota, Ren; Suzuki, Masaki; Osawa, Takeyuki; Yamashita, Koujun; Kunieda, Hideyo; Tawara, Yuzuru; Ogasaka, Yasushi; Furuzawa, Akihiro; Tamura, Keisuke; Shibata, Ryo; Haba, Yoshito; Naitou, Masataka; Misaki, Kazutami
Publications of the Astronomical Society of Japan, 01/2007, Letnik: 59, Številka: sp1Journal Article
We present the design parameters, production process, and in-flight performance of the X-ray telescope (XRT) onboard Suzaku. The imaging capability is significantly improved over the ASCA XRT, which had half-power diameters of ${3\rlap {.}{}^{\mathrm {\prime }}6}$ , to ${1\rlap {.}{}^{\mathrm {\prime }}8}$ – ${2\rlap {.}{}^{\mathrm {\prime }}3}$ for all four XRT-I modules. The optical axes are found to be distributed within a radius of ${1\rlap {.}{}^{\mathrm {\prime }}3}$ , which makes the observation efficiency of all the XRTs more than 97% at the XIS-default observing position. The vignetting over the XIS field of view predicted via ray-tracing coincides with that measured for observations of the Crab Nebula to within $\sim 10\%$ . Contemporaneous fits of a power law to all of the XIS spectra of the Crab Nebula taken at the two standard observing positions (XIS/HXD-default positions) gives a flux consistent with that obtained by Toor and Seward (1974, AJ, 79, 995) to within $\sim 2\%$ . The pre-collimator on the top of each XRT module successfully reduces the intensity of the stray light from the $20'$ and $50'$ -off directions down to the level of pre-flight expectations.
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in: SICRIS
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