ASTRO-H is equipped with two modules of the SXT; one is for the Soft X-ray Spectrometer (SXS), an X-ray calorimeter, and the other is for the Soft X-ray Imager (SXI), an X-ray CCD camera. These SXT modules are called SXT-S and SXT-I, respectively. Of the two detector systems, the SXI has a large field of view, a square with 38' on a side. To cope with this, we have made a mosaic mapping of the stray light at a representative off-axis angle of 30' in the X-ray beam line at the Institute of Space and Astronautical Science. The effective area of the brightest secondary reflection is found of order 0.1% of the on-axis effective area at the energy of 1.49 keV. The other components are not so bright (<5 X 10-4 times smaller than the on-axis effective area). On the other hand, we have found that the effective area of the stray light in the SXS field of view (~3'x3') at large off-axis angles (>15') are ~10-4 times smaller than the on-axis effective area (~590 cm2 at 1.49 keV).
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Toshiki Sato, Ryo Iizuka, Hideyuki Mori, Takayuki Hayashi, Yoshitomo Maeda, Manabu Ishida, Naomichi Kikuchi, Sho Kurashima, Nozomi Nakaniwa, Takashi Okajima, Yang Soong, Peter J. Serlemitsos, "The ASTRO-H SXT performance to the large off-set angles," Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99053X (18 July 2016);