Dept. of Space Astronomy and Astrophysics

Motohide Kokubun

  (国分 紀秀)

Profile Information

Affiliation
Associate Professor, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
Associate Professor, School of Physical Sciences Department of Space and Astronautical Science, The Graduate University for Advanced Studies, SOKENDAI
Center for Advanced Photonics Space-Time Engineering Research Team, RIKEN
Degree
Ph.D.(Mar, 2001, The University of Tokyo)

Researcher number
50334248
ORCID ID
 https://orcid.org/0000-0003-3529-3029
J-GLOBAL ID
200901059420620376
researchmap Member ID
1000367787

External link

Committee Memberships

 1

Major Papers

 248
  • Motohide Kokubun, Kazuo Makishima, Tadayuki Takahashi, Toshio Murakami, Makoto Tashiro, Yasushi Fukazawa, Tuneyoshi Kamae, Greg M. Madejski, Kazuhiro Nakazawa, Kazutaka Yamaoka, Yukikatsu Terada, Daisuke Yonetoku, Shin Watanabe, Toru Tamagawa, Tsunefumi Mizuno, Aya Kubota, Naoki Isobe, Isao Takahashi, Goro Sato, Hiromitsu Takahashi, Soojing Hong, Madoka Kawaharada, Naomi Kawano, Takefumi Mitani, Mio Murashima, Masaya Suzuki, Keiichi Abe, Ryouhei Miyawaki, Masanori Ohno, Takaaki Tanaka, Takayuki Yanagida, Takeshi Itoh, Kousuke Ohnuki, Ken-ichi Tamura, Yasuhiko Endo, Shinya Hirakuri, Tatsuro Hiruta, Takao Kitaguchi, Tetsuichi Kishishita, Satoshi Sugita, Takuya Takahashi, Shin'ichiro Takeda, Teruaki Enoto, Ayumi Hirasawa, Jun'ichiro Katsuta, Satoshi Matsumura, Kaori Onda, Mitsuhiro Sato, Masayoshi Ushio, Shin-nosuke Ishikawa, Koichi Murase, Hirokazu Odaka, Masanobu Suzuki, Yuichi Yaji, Shinya Yamada, Tomonori Yamasaki, Takayuki Yuasa
    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 59(1 SPEC. ISS.) S53-S76, Jan, 2007  Peer-reviewed
    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 similar to 4 keV (FWHM) at 40 keV and similar to 11% at 511 keV, 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 150-500 keV. 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.

Misc.

 303
  • Tajima Hiroyasu, Watanabe Shin, Fukazawa Yasushi, Blandford Roger, Enoto Teruaki, Goldwurm Andrea, Hagino Kouichi, Hayashi Katsuhiro, Ichinohe Yuto, Kataoka Jun, Katsuta Jun'ichiro, Kitaguchi Takao, Kokubun Motohide, Laurent Philippe, Lebrun Francois, Limousin Olivier, Madejski Grzegorz M, Makishima Kazuo, Mizuno Tsunefumi, Mori Kunishiro, Nakamori Takeshi, Nakano Toshio, Nakazawa Kazuhiro, Noda Hirofumi, Odaka Hirokazu, Ohno Masanori, Ohta Masayuki, Saito Shinya, Sato Goro, Sato Rie, Takeda Shin'ichiro, Takahashi Hiromitsu, Takahashi Tadayuki, Tanaka Takaaki, Tanaka Yasuyuki, Terada Yukikatsu, Uchiyama Hideki, Uchiyama Yasunobu, Yamaoka Kazutaka, Yatsu Yoichi, Yonetoku Daisuke, Yuasao Takayuki
    JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS, 4(2), Apr, 2018  Peer-reviewed
    Hitomi (ASTRO-H) was the sixth Japanese x-ray satellite that carried instruments with exquisite energy resolution of <7 eV and broad energy coverage of 0.3 to 600 keV. The Soft Gamma-ray Detector (SGD) was the Hitomi instrument that observed the highest energy band (60 to 600 keV). The SGD design achieves a low background level by combining active shields and Compton cameras where Compton kinematics is utilized to reject backgrounds coming from outside of the field of view. A compact and highly efficient Compton camera is realized using a combination of silicon and cadmium telluride semiconductor sensors with a good energy resolution. Compton kinematics also carries information for gamma-ray polarization, making the SGD an excellent polarimeter. Following several years of development, the satellite was successfully launched on February 17, 2016. After proper functionality of the SGD components were verified, the nominal observation mode was initiated on March 24, 2016. The SGD observed the Crab Nebula for approximately two hours before the spacecraft ceased to function on March 26, 2016. We present concepts of the SGD design followed by detailed description of the instrument and its performance measured on ground and in orbit. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License.
  • 渡辺伸, 渡辺伸, 内田悠介, 内田悠介, 田島宏康, 深沢泰司, 一戸悠人, 内山秀樹, 内山泰伸, 榎戸輝揚, 太田方之, 大野雅功, 小高裕和, 片岡淳, 勝田隼一郎, 北口貴雄, 国分紀秀, GOLDWURM A, 斉藤新也, 佐藤悟朗, 佐藤理江, 高橋忠幸, 高橋忠幸, 高橋弘充, 武田伸一郎, 田中孝明, 田中康之, 寺田幸功, 中澤知洋, 中澤知洋, 中野俊男, 中森健之, 野田博文, 萩野浩一, 林克洋, 林克洋, BLANDFORD R, 牧島一夫, MADEJSKI G, 水野恒史, 森國城, 谷津陽一, 山岡和貴, 湯浅孝行, 米徳大輔, LAURENT P, LIMOUSIN O, LEBRUN F
    日本物理学会講演概要集(CD-ROM), 73(1) ROMBUNNO.25pK307‐5-492, Mar 23, 2018  
  • 鈴木寛大, 中澤知洋, 萩野浩一, 国分紀秀, 佐藤悟朗, 高橋忠幸, 渡辺伸, 太田方之, 佐藤理江, 森國城, 村上浩章, 三宅克馬, 古田禄大, 馬場彩, 鶴剛, 田中孝明, 榎戸輝揚, 小林翔悟, 寺田幸功, 内山秀樹, 谷津洋一, 野田博文, 田島宏康, 山岡和貴, 林克洋, 林克洋, 深沢泰司, 水野恒史, 大野雅功, 高橋弘充, 勝田隼一郎, 中森健之, 内山泰伸, 斉藤新也, 牧島一夫, 小高裕和, 湯浅孝行, 中野俊男, 片岡淳, 三村健人, LEBRUN Francois, LIMOUSIN Olivier, LAURENT Philippe, MAIER Daniel, 武田伸一郎, 森浩二
    日本天文学会年会講演予稿集, 2018 227, Feb 20, 2018  
  • 内田悠介, 渡辺伸, 田島宏康, 深沢泰司, 国分紀秀, 太田方之, 佐藤悟朗, 佐藤理江, 森國城, 高橋忠幸, 高橋忠幸, 水野恒史, 高橋弘充, 大野雅功, 田中康之, 勝田隼一郎, 中澤知洋, 牧島一夫, 小高裕和, 北口貴雄, 中野俊男, 湯浅孝行, 片岡淳, 一戸悠人, 内山秀樹, 内山泰伸, 斉藤新也, 榎戸輝揚, 田中孝明, GOLDWURM A, LAURENT P, LIMOUSIN O, LEBRUN F, 武田伸一郎, 寺田幸功, 中森健之, 野田博文, 萩野浩一, 山岡和貴, 林克洋, 林克洋, BLANDFORD R, MADEJSKI G, 谷津陽一, 米徳大輔
    日本天文学会年会講演予稿集, 2018 148, Feb 20, 2018  
  • 大野雅功, 深沢泰司, 水野恒史, 高橋弘充, 北口貴雄, 田中康之, 勝田隼一郎, 河野貴文, 幅田翔, 岡田千穂, 大橋礼恵, 寺前拓人, 田中晃司, 高橋忠幸, 国分紀秀, 渡辺伸, 佐藤悟朗, 太田方之, 内田悠介, 都丸亮太, 米田浩基, 小高裕和, 小高裕和, 中澤知洋, 村上浩章, 田島宏康, 木下将臣, 山岡和貴, 林克洋
    日本天文学会年会講演予稿集, 2017 246, Aug 20, 2017  

Teaching Experience

 2

Research Projects

 10

Industrial Property Rights

 3