Hard x-ray imager onboard Hitomi (ASTRO-H)

被引：25

作者：

Nakazawa, Kazuhiro ^{[1
,2
]}

Sato, Goro ^{[3
]}

Kokubun, Motohide ^{[3
]}

Enoto, Teruaki ^{[4
,5
]}

Fukazawa, Yasushi ^{[6
]}

Hagino, Kouichi ^{[7
]}

Hayashi, Katsuhiro ^{[3
,8
]}

Kataoka, Jun ^{[9
]}

Katsuta, Junichiro ^{[6
]}

Kobayashi, Shogo B. ^{[10
]}

Laurent, Philippe ^{[11
,12
]}

Lebrun, Francois ^{[11
]}

Limousin, Olivier ^{[12
]}

Maier, Daniel ^{[12
]}

Makishima, Kazuo ^{[13
]}

Mizuno, Tsunefumi ^{[6
,14
]}

Mori, Kunishiro ^{[3
]}

Nakamori, Takeshi ^{[15
]}

Nakano, Toshio ^{[16
]}

Noda, Hirofumi ^{[17
,18
]}

Odaka, Hirokazu ^{[19
]}

Ohno, Masanori ^{[6
]}

Ohta, Masayuki ^{[3
]}

Saito, Shinya ^{[20
]}

Sato, Rie ^{[3
]}

Tajima, Hiroyasu ^{[21
]}

Takahashi, Hiromitsu ^{[6
]}

Takahashi, Tadayuki ^{[3
]}

Takeda, Shin'ichiro ^{[22
]}

Tanaka, Takaaki ^{[10
]}

Terada, Yukikatsu ^{[23
]}

Uchiyama, Hideki ^{[24
]}

Uchiyama, Yasunobu ^{[20
]}

Watanabe, Shin ^{[3
]}

Yamaoka, Kazutaka ^{[8
,21
]}

Yatsu, Yoichi ^{[25
]}

Yuasa, Takayuki ^{[13
]}

机构：

[1] Univ Tokyo, Dept Phys, Tokyo, Japan

[2] Univ Tokyo, Res Ctr Early Universe, Sch Sci, Tokyo, Japan

[3] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan

[4] Kyoto Univ, Dept Astron, Kyoto, Japan

[5] Kyoto Univ, Hakubi Ctr Adv Res, Kyoto, Japan

[6] Hiroshima Univ, Sch Sci, Higashihiroshima, Japan

[7] Tokyo Univ Sci, Dept Phys, Tokyo, Japan

[8] Nagoya Univ, Dept Phys, Nagoya, Aichi, Japan

[9] Waseda Univ, Res Inst Sci & Engn, Shinjuku Ku, Tokyo, Japan

[10] Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto, Japan

[11] Lab APC, Paris, France

[12] CEA Saclay, Gif Sur Yvette, France

[13] Inst Phys & Chem Res, Wako, Saitama, Japan

[14] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Hiroshima, Japan

[15] Yamagata Univ, Fac Sci, Yamagata, Japan

[16] RIKEN, Nishina Ctr, Wako, Saitama, Japan

[17] Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Sendai, Miyagi, Japan

[18] Tohoku Univ, Astron Inst, Sendai, Miyagi, Japan

[19] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA

[20] Rikkyo Univ, Dept Phys, Tokyo, Japan

[21] Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan

[22] Okinawa Inst Sci & Technol Grad Univ, Okinawa, Japan

[23] Saitama Univ, Dept Phys, Saitama, Japan

[24] Shizuoka Univ, Fac Educ, Shizuoka, Japan

[25] Tokyo Inst Technol, Dept Phys, Tokyo, Japan

来源：

JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS | 2018年 / 4卷 / 02期

关键词：

gamma rays; x-rays; detectors; satellites; astronomy; IN-ORBIT PERFORMANCE; DETECTORS; DESIGN; HXD;

D O I：

10.1117/1.JATIS.4.2.021410

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

The hard x-ray imaging spectroscopy system of "Hitomi" x-ray observatory is composed of two sets of hard x-ray imagers (HXI) coupled with hard x-ray telescopes (HXT). With a 12-m focal length, the system provides fine (1'.7 half-power diameter) imaging spectroscopy covering about 5 to 80 keV. The HXI sensor consists of a camera, which is composed of four layers of Si and one layer of CdTe semiconductor imagers, and an active shield composed of nine Bi4Ge3O12 scintillators to provide low background. The two HXIs started observation on March 8 and 14, 2016 and were operational until 26 March. Using a Crab observation, 5 to 80 keV energy coverage and good detection efficiency were confirmed. The detector background level of 1 to 3 x 10(-4) counts s(-1) keV(-1) cm(-2) (in detector geometrical area) at 5 to 80 keV was achieved, by cutting the high-background time-intervals, adopting sophisticated energy-dependent imager layer selection, and baffling of the cosmic x-ray background and active-shielding. This level is among the lowest of detectors working in this energy band. By comparing the effective area and the background, it was shown that the HXI had a sensitivity that is same to that of NuSTAR for point sources and 3 to 4 times better for largely extended diffuse sources. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License.

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