論文

公開件数: 39 件
No. 掲載種別 単著・共著区分 タイトル 著者 誌名 出版者 巻号頁 出版日 ISSN DOI URL 概要
1 研究論文(学術雑誌)
共著
Remote measurement of urinary radioactivity in 18F-FDG PET patients using Compton camera for accuracy evaluation of standardized uptake value
[F-1] Watanabe, Takara; Kano, Daisuke ; Enomoto, Ryoji; Muraishi, Hiroshi; Wakamatsu, Ryo ; Katagiri, Hideaki ; Kagaya, Mika ; Kondo, Ryotaro ; Fukushi, Masahiro ; Hosokawa, Syota ; Takeda, Tohoru; M. Tanaka, Manobu; Uchida, Tomohisa; Nakagami, Yoshihiro
Biomed. Phys. Eng. Express

4, 065029
2018/10/25

10.1088/2057-1976/aae6b8

Currently, the most commonly used estimate of metabolic activity during clinical positron emission
tomography (PET) is standardized uptake value (SUV) obtained from 18F-fluorodeoxyglucose
(18F-FDG) captured in cancer cells. Although SUV is evaluated after corrections for the injected dose,
weight, and other such parameters, the entire injected dose is inappropriate for this calculation
because someFDGis excreted in urine. Therefore, the injected dose warrants correction by assessment
of urinary radioactivity in patients before PET to enhance the accuracy of FDG calculation. However,
this is not typically performed in clinical practice owing to secondary effects of radioactive
contamination in hospitals and radiation exposure risk to the attending staff. Therefore, we aimed to
develop a remote method for the measurement of urinary radioactivity in FDG-PET patients. Urinary
radioactivity was estimated in a toilet bowl using gamma-ray distribution obtained with a Compton
camera. The gamma-ray events from the toilet bowl per unit time (5 s) facilitated radioactivity
calculation. Between 0 and 40 MBq, deviation of our detector from the linearity for radioactivity was
<8.3%.
2 研究論文(学術雑誌)
共著
Development of an all-sky gamma-ray Compton camera based on scintillators for high-dose environments
Hideaki Katagiri, Wataru Satoh, Ryoji Enomoto, Ryo Wakamatsu, Takara Watanabe, Hiroshi Muraishi, Mika Kagaya, Souichi Tanaka, Kiyoto Wada, Manobu Tanaka & Tomohisa Uchida
Journal of Nuclear Science and Technology

55/ 10, 1172-1179
2018/06/19

10.1080/00223131.2018.1485598

We developed an all-sky Compton camera for the detection of sub-MeV gamma rays emitted by radioactive cesium in high-dose environments. The camera consisted of six NaI (Tl) scintillators with a diameter of 1/2 in (1.3 cm) placed symmetrically at the vertexes of an octahedron. Irradiation tests with a point-like source at a high-dose irradiation facility confirmed that the camera can measure the arrival directions of sub-MeV gamma rays and visualize a gamma-ray source distribution in environments of up to ∼1 mSv/h. Due to the symmetrical geometry of the camera, the directional variance of its acceptance fell within ±23% (full width) of the average value. The camera capability to detect gamma rays in high-dose environments, in which multiple and/or extended sources exist, was verified in environments of up to ∼0.2 mSv/h by tests at the Fukushima Daiichi nuclear power plant. The imaging capability was confirmed also in lower dose environments such as 1 μSv/h for a reasonable observation time of 2 h, indicating that the developed camera is adequate for practical use in environments with a wide dynamic range of dose rate (∼200 times), i.e. from 1 μSv/h to 0.2 mSv/h.
3 研究論文(学術雑誌)
共著
Development of an omnidirectional gamma-ray imaging Compton camera for low-radiation-level environmental monitoring
Watanabe Takara, Enomoto Ryoji, Muraishi Hiroshi, Katagiri Hideaki, Kagaya Mika, Fukushi Masahiro, Kano Daisuke, Satoh Wataru, Takeda Tohoru, Tanaka Manobu, Tanaka Souichi, Uchida Tomohisa, Wada Kiyoto, Wakamatsu Ryo
Jpn. J. Appl. Phys.
Institute of Physics
57/ 2
2017/12/27
0021-4922

URL
We have developed an omnidirectional gamma-ray imaging Compton camera for environmental monitoring at low levels of radiation. The camera consisted of only six CsI(Tl) scintillator cubes of 3.5 cm, each of which was readout by super-bialkali photo-multiplier tubes (PMTs). Our camera enables the visualization of the position of gamma-ray sources in all directions (∼4π sr) over a wide energy range between 300 and 1400 keV. The angular resolution (σ) was found to be ∼11°, which was realized using an image-sharpening technique. A high detection efficiency of 18 cps/(µSv/h) for 511 keV (1.6 cps/MBq at 1 m) was achieved, indicating the capability of this camera to visualize hotspots in areas with low-radiation-level contamination from the order of µSv/h to natural background levels. Our proposed technique can be easily used as a low-radiation-level imaging monitor in radiation control areas, such as medical and accelerator facilities.
4 研究論文(学術雑誌)
共著
Constraints on Physical Conditions for the Acceleration on Ultra-high-energy Cosmic Rays in Nearby Active Galactic Nuclei Observed with the Fermi Large Area Telescope
Kagaya, M., Katagiri, H., Yoshida, T., and Fukuda, A.
The Astrophysical Journal

850/ 33
2017/11



We investigated the possibility of acceleration of ultra-high-energy cosmic rays (UHECRs) in nearby active galactic nuclei (AGNs) using archival multi-wavelength observational data, and then we constrained their physical conditions, i.e., the luminosity of the synchrotron radiation and the size of the acceleration site. First, we investigated the spatial correlation between the arrival directions of UHECRs and the positions of nearby AGNs in the Fermi third gamma-ray source catalog. We selected 27 AGNs as candidates of accelerators of UHECRs. Then, we evaluated the physical conditions in the acceleration regions of these AGNs via the Pe'er and Loeb method, which uses the peak luminosity of synchrotron radiation and the peak flux ratio of inverse Compton scattering to synchrotron radiation. From the evaluation, we found that six AGNs have the ability to accelerate ultra-high-energy (UHE) protons in the AGN cores. Furthermore, we found that the minimum acceleration size must be more than a few kpc for acceleration of UHE protons in the AGN lobes.
5 研究論文(学術雑誌)
共著
Fermi LAT Discovery of Extended Gamma-Ray Emissions in the Vicinity of the HB 3 Supernova Remnant

The Astrophysical Journal

818, 114
2016

10.3847/0004-637X/818/2/114

We report the discovery of extended gamma-ray emission measured by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope in the region of the supernova remnant (SNR) HB 3 (G132.7+1.3) and the W3 II complex adjacent to the southeast of the remnant. W3 is spatially associated with bright 12CO (J = 1-0) emission. The gamma-ray emission is spatially correlated with this gas and the SNR. We discuss the possibility that gamma rays originate in interactions between particles accelerated in the SNR and interstellar gas or radiation fields. The decay of neutral pions produced in nucleon-nucleon interactions between accelerated hadrons and interstellar gas provides a reasonable explanation for the gamma-ray emission. The emission from W3 is consistent with irradiation of the CO clouds by the cosmic rays accelerated in HB 3.
6 研究論文(学術雑誌)
共著
Optical Spectroscopic Observations of Gamma-Ray Blazar Candidates. VI. Further Observations from TNG, WHT, OAN, SOAR, and Magellan Telescopes

The Astronomical Journal

151, 10
2016



Blazars, one of the most extreme classes of active galaxies, constitute so far the largest known population of γ-ray sources, and their number is continuously growing in the Fermi catalogs. However, in the latest release of the Fermi catalog there is still a large fraction of sources that are classified as blazar candidates of uncertain type (BCUs) for which optical spectroscopic observations are necessary to confirm their nature and their associations. In addition
7 研究論文(学術雑誌)
共著
Fermi LAT Study of Gamma-Ray Emission in the Direction of the Monoceros Loop Supernova Remnant

The Astrophysical Journal

831, 106
2016

10.3847/0004-637X/831/1/106

We present an analysis of the gamma-ray measurements by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope in the region of the supernova remnant (SNR) Monoceros Loop (G205.5+0.5). The brightest gamma-ray peak is spatially correlated with the Rosette Nebula, which is a molecular cloud complex adjacent to the southeast edge of the SNR. After subtraction of this emission by spatial modeling, the gamma-ray emission from the SNR emerges, which is extended and fit by a Gaussian spatial template. The gamma-ray spectra are significantly better reproduced by a curved shape than a simple power law. The luminosities between 0.2 and 300 GeV are ˜ 4× {10}34 erg s-1 for the SNR and ˜ 3× {10}34 erg s-1 for the Rosette Nebula, respectively. We argue that the gamma-rays likely originate from the interactions of particles accelerated in the SNR. The decay of neutral pions produced in nucleon-nucleon interactions of accelerated hadrons with interstellar gas provides a reasonable explanation for the gamma-ray emission of both the Rosette Nebula and the Monoceros SNR.
8 研究論文(学術雑誌)
共著
Development of a Low-Cost-High-Sensitivity Compton Camera using CsI (Tl) Scintillators (γI)

Nuclear Inst. and Methods in Physics Research A

804, 25-32
2015

10.1016/j.nima.2015.09.014

We have developed a novel low-cost gamma-ray imaging Compton camera γI that has a high detection efficiency. Our motivation for the development of this detector was to measure the arrival directions of gamma rays produced by radioactive nuclides that were released by the Fukushima Daiichi nuclear power plant accident in 2011. The detector comprises two arrays of inorganic scintillation detectors, which act as a scatterer and an absorber. Each array has eight scintillation detectors, each comprising a large CsI (Tl) scintillator cube of side 3.5 cm, which is inexpensive and has a good energy resolution. Energies deposited by the Compton scattered electrons and subsequent photoelectric absorption, measured by each scintillation counter, are used for image reconstruction. The angular resolution was found to be 3.5° after using an image-sharpening technique. With this angular resolution, we can resolve a 1 m2 radiation hot spot that is located at a distance of 10 m from the detector with a wide field of view of 1 sr. Moreover, the detection
9 研究論文(学術雑誌)
共著
コンプトンカメラ法における新しい画像再構成法の提案
村石 浩、加賀谷 美佳、片桐 秀明、武田 徹、渡辺 宝
日本保健科学学会誌

17/ 3, 159-164
2014




10 研究論文(学術雑誌)
共著
Detailed Investigation of the Gamma-Ray Emission in the Vicinity of SNR W28 with FERMI-LAT

The Astrophysical Journal

786/ 145
2014/05

10.1088/0004-637X/786/2/145

We present a detailed investigation of the γ-ray emission in the vicinity of the supernova remnant (SNR) W28 (G6.4–0.1) observed by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. We detected significant γ-ray emission spatially coincident with TeV sources HESS J1800–240A, B, and C, located outside the radio boundary of the SNR. Their spectra in the 2-100 GeV band are consistent with the extrapolation of the power-law spectra of the TeV sources. We also identified a new source of GeV emission, dubbed Source W, which lies outside the boundary of TeV sources and coincides with radio emission from the western part of W28. All of the GeV γ-ray sources overlap with molecular clouds in the velocity range from 0 to 20 km s–1. Under the assumption that the γ-ray emission toward HESS J1800–240A, B, and C comes from π0 decay due to the interaction between the molecular clouds and cosmic rays (CRs) escaping from W28, they can be naturally explained by a single model in which the CR diffusion coefficient is smaller than the theoretical expectation in the interstellar space. The total energy of the CRs escaping from W28 is constrained through
11 研究論文(学術雑誌)
共著
X-Ray Observations of the W 51 Complex with Suzaku

Publications of the Astronomical Society of Japan

65, 42
2013

10.1093/pasj/65.2.42


12 研究論文(学術雑誌)
共著
Introducing the CTA concept

Astroparticle Physics

43, 3-18
2013/03

10.1016/j.astropartphys.2013.01.007


13 研究論文(学術雑誌)
共著
Fermi Large Area Telescope Discovery of GeV Gamma-Ray Emission from the Vicinity of SNR W44

The Astrophysical Journal Letters

749, L35-L39
2012




14

超新星残骸の折れ曲がったガンマ線スペクトルについての研究
花畑 義隆, 片桐 秀明
天文月報
日本天文学会
105/ 6, 365-373
2012/05/20
03742466

URL

15 研究論文(学術雑誌)
共著
Fermi Large Area Telescope Observations of the Supernova Remnant G8.7-0.1
Ajello, M. and the Fermi LAT collaboration (corresponding author: H. Katagiri et al.)
The Astrophysical Journal

744, 80-90
2011



フェルミ衛星による超新星残骸W28のガンマ線による観測。空間的相関およびスペクトルから、ガンマ線の起源は超新星残骸で加速された粒子と分子雲の反応で生じるπ0粒子の崩壊ガンマ線で自然に説明できることを示した。
16 研究論文(学術雑誌)
共著
Fermi Large Area Telescope Observations of the Cygnus Loop Supernova Remnant
Katagiri, H., et al.
The Astrophysical Journal

741, 44-52
2011



フェルミ衛星による超新星残骸W28のガンマ線による観測。空間的相関およびスペクトルから、ガンマ線の起源は超新星残骸で加速された粒子と分子雲の反応で生じるπ0粒子の崩壊ガンマ線で自然に説明できることを示した。
17

Observations of the Large Magellanic Cloud with Fermi
Fukazawa Yasushi, Hanabata Yoshitaka, Katagiri Hideaki, Mizuno Tsunefumi, Ohsugi Takashi, Takahashi Hiromitsu
Astronomy & Astrophysics
EDP Sciences S A
512, A7-1-A7-15
2010
0004-6361

URL
Context. The Large Magellanic Cloud (LMC) is to date the only normal external galaxy that has been detected in high-energy gamma rays. High-energy gamma rays trace particle acceleration processes and gamma-ray observations allow the nature and sites of acceleration to be studied.Aims. We characterise the distribution and sources of cosmic rays in the LMC from analysis of gamma-ray observations.Methods. We analyse 11 months of continuous sky-survey observations obtained with the Large Area Telescope aboard the Fermi Gamma-Ray Space Telescope and compare it to tracers of the interstellar medium and models of the gamma-ray sources in the LMC.Results. The LMC is detected at 33σ significance. The integrated >100 MeV photon flux of the LMC amounts to (2.6 ± 0.2) × 10-7 ph cm-2 s-1 which corresponds to an energy flux of (1.6 ± 0.1) × 10-10 erg cm-2 s-1, with additional
18 (MISC)総説・解説(その他)
共著
フェルミ衛星による超新星残骸からのガンマ線放射の研究
片桐秀明、内山泰伸、釜江常好、田島宏康、田中孝明、山崎了
天文月報

103/ 7
2010




19 研究論文(学術雑誌)
共著
Fermi Large Area Telescope Observations of the Supernova Remnant W28 (G6.4-0.1)
Abdo, A. and the Fermi LAT collaboration (corresponding author: H. Katagiri et al.)
The Astrophysical Journal

718, 348-356
2010



フェルミ衛星による超新星残骸W28のガンマ線による観測。空間的相関およびスペクトルから、ガンマ線の起源は超新星残骸で加速された粒子と分子雲の反応で生じるπ0粒子の崩壊ガンマ線で自然に説明できることを示した。
20 研究論文(学術雑誌)

Infrared/optical-X-ray simultaneous observations of X-ray flares in GRB 071112C and GRB 080506
Uehara Takeshi, Uemura Makoto, Kawabata Koji S, Fukazawa Yasushi, Yamazaki Ryo, Arai Akira, Sasada Mahito, Ohsugi Takashi, Mizuno Tsunefumi, Takahashi Hiromitsu, Katagiri Hideaki, Yamashita Takuya, Ohno Masanori, Sato Goro, Sato Shuji, Kino Masaru
Astronomy & Astrophysics
EDP Sciences S A
519, A56-1-A56-9
2010/09
0004-6361

URL
Aims. We investigate the origin of short X-ray flares which are occasionally observed in early stages of afterglows of gamma-ray bursts (GRBs).Methods. We observed two Swift events, GRB 071112C and GRB 080506, before the start of X-ray flares in the optical and near-infrared (NIR) bands with the 1.5-m Kanata telescope. In conjunction with published X-ray and optical data, we analyzed densely sampled light curves of the early afterglows and spectral energy distributions (SEDs) in the NIR-X-ray ranges.Results. We found that the SEDs had a break between the optical and X-ray bands in the normal decay phases of both GRBs regardless of the model for the correction of the interstellar extinction in host galaxies of GRBs. In the X-ray flares, X-ray flux increased by 3 and 15 times in the case of GRB 071112C and 080506, respectively, and the X-ray spectra became harder than those in the normal decay phases. No significant variation in the optical-NIR range was detected together with the X-ray flares.Conclusions. These results suggest that the X-ray flares were associated with either late internal shocks or external shocks from two-component jets.
21

Infrared/optical-X-ray simultaneous observations of X-ray flares in GRB 071112C and GRB 080506
Uehara Takeshi, Uemura Makoto, Kawabata Koji S, Fukazawa Yasushi, Yamazaki Ryo, Arai Akira, Sasada Mahito, Ohsugi Takashi, Mizuno Tsunefumi, Takahashi Hiromitsu, Katagiri Hideaki, Yamashita Takuya, Ohno Masanori, Sato Goro, Sato Shuji, Kino Masaru
Astronomy & Astrophysics
EDP Sciences S A
519, A56-1-A56-9
2010/09
0004-6361

URL
Aims. We investigate the origin of short X-ray flares which are occasionally observed in early stages of afterglows of gamma-ray bursts (GRBs).Methods. We observed two Swift events, GRB 071112C and GRB 080506, before the start of X-ray flares in the optical and near-infrared (NIR) bands with the 1.5-m Kanata telescope. In conjunction with published X-ray and optical data, we analyzed densely sampled light curves of the early afterglows and spectral energy distributions (SEDs) in the NIR-X-ray ranges.Results. We found that the SEDs had a break between the optical and X-ray bands in the normal decay phases of both GRBs regardless of the model for the correction of the interstellar extinction in host galaxies of GRBs. In the X-ray flares, X-ray flux increased by 3 and 15 times in the case of GRB 071112C and 080506, respectively, and the X-ray spectra became harder than those in the normal decay phases. No significant variation in the optical-NIR range was detected together with the X-ray flares.Conclusions. These results suggest that the X-ray flares were associated with either late internal shocks or external shocks from two-component jets.
22 研究論文(学術雑誌)
共著
Optical and Near-Infrared Photometry of Nova V2362 Cyg : Rebrightening Event and Dust Formation
Arai Akira, Uemura Makoto, Kawabata Koji S., MAEHARA Hiroyuki, NAKAJIMA Kazuhiro, KIYOTA Seiichiro, KATO Taichi, OHSUGI Takashi, YAMASHITA Takuya, ISOGAI Mizuki, NAGAE Osamu, CHIYONOBU Shingo, FUKAZAWA Yasushi, MIZUNO Tsunefumi, KATAGIRI Hideaki, TAKAHASHI Hiromitsu, OKITA Kiichi, YOSHIDA Michitoshi, YANAGISAWA Kenshi, SATO Shuji, KINO Masaru, KITAGAWA Masahiro, SADAKANE Kozo
PASJ : publications of the Astronomical Society of Japan
Astronomical Society of Japan
62/ 4, 1103-1108
2010/08/25
00046264

URL

23 研究論文(学術雑誌)
共著
Multiband Photopolarimetric Monitoring of an Outburst of the Blazar 3C 454.3 in 2007
Sasada Mahito, Uemura Makoto, Arai Akira, FUKAZAWA Yasushi, KAWABATA Koji S., OHSUGI Takashi, YAMASHITA Takuya, ISOGAI Mizuki, NAGAE Osamu, UEHARA Takeshi, MIZUNO Tsunefumi, KATAGIRI Hideaki, TAKAHASHI Hiromitsu, SATO Shuji, KINO Masaru
PASJ : publications of the Astronomical Society of Japan
Astronomical Society of Japan
62/ 3, 645-652
2010/06/25
00046264

URL

24 研究論文(学術雑誌)
共著
Gamma-ray spectrum of RX J1713.7-3946 in the Fermi era and future detection of neutrinos
Yamazaki R., Kohri K., Katagiri H.
Astronomy and Astrophysics

495, 9-13
2009




25 研究論文(学術雑誌)
共著
Optical and Near-Infrared Photometric Observation during the Superoutburst of the WZ Sge-Type Dwarf Nova, V455 Andromedae
Matsui Risako, Uemura Makoto, Arai Akira, SASADA Mahito, OHSUGI Takashi, YAMASHITA Takuya, KAWABATA Koji, FUKAZAWA Yasushi, MIZUNO Tsumefumi, KATAGIRI Hideaki, TAKAHASHI Hiromitsu, SATO Shuji, KINO Masaru, YOSHIDA Michitoshi, SHIMIZU Yasuhiro, NAGAYAMA Shogo, YANAGISAWA Kenshi, TODA Hiroyuki, OKITA Kiichi, KAWAI Nobuyuki
PASJ : publications of the Astronomical Society of Japan
Astronomical Society of Japan
61/ 5, 1081-1092
2009/10/25
00046264

URL

26 研究論文(学術雑誌)
共著
Anti-Correlation of Near-Infrared and X-Ray Variations of the Microquasar GRS 1915+105 in the Soft State
Arai Akira, Uemura Makoto, Sasada Mahito, TRUSHKIN Sergei A., UEDA Yoshihiro, TAKAHASHI Hiromitsu, KAWABATA Koji S., YAMANAKA Masayuki, NAGAE Osamu, IKEJIRI Yuki, SAKIMOTO Kiyoshi, MATSUI Risako, OHSUGI Takashi, YAMASHITA Takuya, ISOGAI Mizuki, FUKAZAWA Yasushi, MIZUNO Tsunefumi, KATAGIRI Hideaki, OKITA Kiichi, YOSHIDA Michitoshi, YANAGISAWA Kenshi, SATO Shuji, KINO Masaru, SADAKANE Kozo
PASJ : publications of the Astronomical Society of Japan
Astronomical Society of Japan
61/ 3, L1-L5
2009/06/25
00046264

URL

27 研究論文(学術雑誌)
共著
Search for Sc-K Line Emission from RX J0852.0-4622 Supernova Remnant with Suzaku
Hiraga Junko S., Kobayashi Yusuke, Tamagawa Toru, HAYATO Asami, BAMBA Aya, TERADA Yukikatsu, PETRE Robert, KATAGIRI Hideaki, TSUNEMI Hiroshi
PASJ : publications of the Astronomical Society of Japan
Astronomical Society of Japan
61/ 2, 275-281
2009/04/25
00046264

URL
We searched for evidence of line emission around 4 keV from the northwestern rim of the supernova remnant RX J0852.0-4622 using Suzaku XIS data. Several papers have reported on the detection of an emission line around 4.1 keV from this region of the sky. This line Would arise from K-band fluorescence by Sc-44, the immediate decay product of Ti-44. We performed spectral analysis for the entire portion of the NW rim of the remnant within the XIS field of view, as well as various regions corresponding to regions of published claims of line emission. We found no line emission around 4.1 keV anywhere, and are able to set a restrictive Upper limit to the X-ray flux: 1.1 x 10(-6) s(-1) cm(-2) for the entire field. For every region, our flux upper limit falls below that of the previously claimed detection. Therefore, we conclude that, to date, no definite X-ray line feature from Sc-K emission has been detected in the NW rim of RX J0852.0-4622. Our negative-detection supports the recent claim that RX J0852-4622 is neither young (1700-4000 yr) nor nearby (similar to 750 pc).arXiv:0906.0216v1 [astro-ph.HE] http://arxiv.org/abs/0906.0216/
28 研究論文(学術雑誌)
共著
The 2006 November Outburst of EG Aquarii : the SU UMa Nature Revealed
Imada Akira, Stubbings Rod, Kato Taichi, UEMURA Makoto, KRAJCI Thomas, TORII Ken'ichi, SUGIYASU Kei, KUBOTA Kaori, MORITANI Yuuki, ISHIOKA Ryoko, MASI Gianluca, KIYOTA Seiichiro, MONARD L. A. G., MAEHARA Hiroyuki, NAKAJIMA Kazuhiro, ARAI Akira, OHSUGI Takashi, YAMASHITA Takuya, KAWABATA Koji S., NAGAE Osamu, CHIYONOBU Shingo, FUKAZAWA Yasushi, MIZUNO Tsunefumi, KATAGIRI Hideaki, TAKAHASHI Hiromitsu, UEDA Atsushi, HAYASHI Takehiro, OKITA Kiichi, YOSHIDA Michitoshi, YANAGISAWA Kenshi, SATO Shuji, KINO Masaru, KITAGAWA Masahiro, SADAKANE Kozo, NOGAMI Daisaku
PASJ : publications of the Astronomical Society of Japan
Astronomical Society of Japan
60/ 5, 1151-1158
2008/10/25
00046264

URL

29 研究論文(学術雑誌)
共著
Discovery of a WZ Sge-Type Dwarf Nova, SDSS J102146.44+234926.3 : Unprecedented Infrared Activity during a Rebrightening Phase
Uemura Makoto, Arai Akira, Krajci Tom, PAVLENKO Elena, SHUGAROV Sergei Yu., KATYSHEVA Nataly A., GORANSKIJ Vitalij P., MAEHARA Hiroyuki, IMADA Akira, KATO Taichi, NOGAMI Daisaku, NAKAJIMA Kazuhiro, OHSUGI Takashi, YAMASHITA Takuya, KAWABATA Koji S., NAGAE Osamu, CHIYONOBU Shingo, FUKAZAWA Yasushi, MIZUNO Tsunefumi, KATAGIRI Hideaki, TAKAHASHI Hiromitsu, UEDA Atsushi, HAYASHI Takehiro, OKITA Kiichi, YOSHIDA Michitoshi, YANAGISAWA Kenshi, SATO Shuji, KINO Masaru, SADAKANE Kozo
PASJ : publications of the Astronomical Society of Japan
Astronomical Society of Japan
60/ 2, 227-236
2008/04/25
00046264

URL

30 研究論文(学術雑誌)
共著
Measuring the Broad-Band X-Ray Spectrum from 400eV to 40keV in the Southwest Part of the Supernova Remnant RX J1713.7-3946
Takahashi Tadayuki, Tanaka Takaaki, Uchiyama Yasunobu, HIRAGA Junko S., NAKAZAWA Kazuhiro, WATANABE Shin, BAMBA Aya, HUGHES John P., KATAGIRI Hideaki, KATAOKA Jun, KOKUBUN Motohide, KOYAMA Katsuji, MORI Koji, PETRE Robert, TAKAHASHI Hiromitsu, TSUBOI Yoko
PASJ : publications of the Astronomical Society of Japan
Astronomical Society of Japan
60/ 1, S131-S140
2008/02/20
00046264

URL

31 研究論文(学術雑誌)
共著
Suzaku Wide-Band Observations of SN 1006
Bamba Aya, Fukazawa Yasushi, Hiraga Junko S., HUGHES John P., KATAGIRI Hideaki, KOKUBUN Motohide, KOYAMA Katsuji, MIYATA Emi, MIZUNO Tsunefumi, MORI Koji, NAKAJIMA Hiroshi, OZAKI Masanobu, PETRE Rob, TAKAHASHI Hiromitsu, TAKAHASHI Tadayuki, TANAKA Takaaki, TERADA Yukikatsu, UCHIYAMA Yasunobu, WATANABE Shin, YAMAGUCHI Hiroya
PASJ : publications of the Astronomical Society of Japan
Astronomical Society of Japan
60/ 1, S153-S161
2008/02/20
00046264

URL

32 研究論文(学術雑誌)
共著
Discovery of Extended X-Ray Emission from an Unidentified TeV Source, HESS J1614-518, Using the Suzaku Satellite
Matsumoto Hironori, Uchiyama Hideki, Sawada Makoto, TSURU Takeshi G., KOYAMA Katsuji, KATAGIRI Hideaki, YAMAZAKI Ryo, BAMBA Aya, KOHRI Kazunori, MORI Koji, UCHIYAMA Yasunobu
PASJ : publications of the Astronomical Society of Japan
Astronomical Society of Japan
60/ 1, S163-S172
2008/02/20
00046264

URL

33 研究論文(学術雑誌)
共著
Performance of Pixel-Readout Micro-Pixel Chamber with Analog-Readout System Used as X-ray Polarimeter
Katagiri, H. et al.
Jpn. J. Appl. Phys.

46/ 12, 7932-7938
2007



宇宙X線の偏光検出用ピクセル読み出し型μ-PIC(Micro Pixel Chamber)を読み出すアナログ信号読み出しシステムを開発。ビーム試験によりX線偏光に対する感度を評価し、シミュレーションと一致する結果が得られた。
34 研究論文(学術雑誌)
共著
Development of a Pixel-Readout μ-PIC (Micro Pixel Chamber) for X-ray Polarimetry
Katagiri, H. et al.
Jpn. J. Appl. Phys.

46/ 5A, 3101-3110
2007



宇宙X線の偏光検出のためにピクセル読み出し型μ-PIC(Micro Pixel Chamber)を開発
35

Millenium Study of SN 1006 with Suzaku
Bamba Aya, Yamaguchi Hiroya, Koyama Katsuji, HIRAGA Junko S., HOLT Steve, HUGHES John P., KATAGIRI Hideaki, KATAOKA Jun, KITAMOTO Shunji, KOKUBUN Motohide, MATUMOTO Hironori, MIYATA Emi, MORI Koji, NAKAJIMA Hiroshi, OZAKI Masanobu, PETRE Robert, SEKIGUCHI Akiko, TAKAHASHI Tadayuki, TANAKA Takaaki, TERADA Yukikatsu, TOMIDA Hiroshi, TSUNEMI Hiroshi, TSUBOI Yohko, TSUJIMOTO Masahiro, UCHIYAMA Yasunobu, UENO Masaru, WATANABE Shin
Progress of theoretical physics. Supplement
Published for the Yukawa Institute for Theoretical Physics and the Physical Society of Japan
169, 142-145
2007/12/19
03759687

URL
SN 1006 is the milestone of understanding the acceleration mechanism of cosmic rays, and this year is the millennium year for the remnant. We carried out SN 1006 mapping observations with the X-ray Imaging Spectrometers (XIS) onboard Suzaku satellite. Thanks to the excellent spectral response of XIS, K emission lines from highly ionized oxygen were clearly resolved. The intensity maps of these lines have been made additional to the intensity and photon index maps of the nonthermal component. We discovered that regions with strong and hard nonthermal component has weak thermal emission. The north rim of the SNR has the hardest nonthermal component. These facts might have information of efficient cosmic ray acceleration and background plasma.
36

Suzaku Observation of TeV SNR RX J1713.7-3946
Takahashi Tadayuki, Tanaka Takaaki, Uchiyama Yasunobu, HIRAGA Junko S., NAKAZAWA Kazuhiro, WATANABE Shin, BAMBA Aya, HUGHES John P., KATAGIRI Hideaki, KATAOKA Jun, KOKUBUN Motohide, KOYAMA Katsuji, MORI Koji, PETRE Robert, TAKAHASHI Hiromitsu, TSUBOI Yoko
Progress of theoretical physics. Supplement
Published for the Yukawa Institute for Theoretical Physics and the Physical Society of Japan
169, 157-161
2007/12/19
03759687

URL
We report on results from Suzaku broadband X-ray observations of the Galactic supernova remnant (SNR) RX J1713.7-3946 with an energy coverage of 0.4-40keV. With a sensitive hard X-ray measurement from the HXD PIN on board Suzaku, we determine the hard X-ray spectrum in the 12-40keV range to be described by a power law with photon index Γ = 3.2±0.2, significantly steeper than the soft X-ray index of Γ = 2.4±0.05 measured previously with ASCA and other missions. We find that a simple power law fails to describe the full spectral range of 0.4-40keV and instead a cutoff power law with hard index Γ = 1.96±0.05 and high energy cutoff ε_c = 9±1keV provides an excellent fit over the full bandpass.
37 研究論文(学術雑誌)
共著
The X-Ray Observatory Suzaku
Mitsuda Kazuhisa, Bautz Mark, Inoue Hajime, KELLEY Richard. L., KOYAMA Katsuji, KUNIEDA Hideyo, MAKISHIMA Kazuo, OGAWARA Yoshiaki, PETRE Robert, TAKAHASHI Tadayuki, TSUNEMI Hiroshi, WHITE Nicholas E., ANABUKI Naohisa, ANGELINI Lorella, ARNAUD Keith, AWAKI Hisamitsu, BAMBA Aya, BOYCE Kevin, BROWN Gregory V., CHAN Kai-Wing, COTTAM Jean, DOTANI Tadayasu, DOTY John, EBISAWA Ken, EZOE Yuichiro, FABIAN Andrew C., FIGUEROA Enectali, FUJIMOTO Ryuichi, FUKAZAWA Yasushi, FURUSHO Tae, FURUZAWA Akihiro, GENDREAU Keith, GRIFFITHS Richard E., HABA Yoshito, HAMAGUCHI Kenji, HARRUS Ilana, HASINGER Gunther, HATSUKADE Isamu, HAYASHIDA Kiyoshi, HENRY Patrick J., HIRAGA Junko S., HOLT Stephen S., HORNSCHEMEIER Ann, HUGHES John P., HWANG Una, ISHIDA Manabu, ISHISAKI Yoshitaka, ISOBE Naoki, ITOH Masayuki, IYOMOTO Naoko, KAHN Steven M., KAMAE Tuneyoshi, KATAGIRI Hideaki, KATAOKA Jun, KATAYAMA Haruyoshi, KAWAI Nobuyuki, KILBOURNE Caroline, KINUGASA Kenzo, KISSEL Steve, KITAMOTO Shunji, KOHAMA Mitsuhiro, KOHMURA Takayoshi, KOKUBUN Motohide, KOTANI Taro, KOTOKU Jun'ichi, KUBOTA Aya, MADEJSKI Greg M., MAEDA Yoshitomo, MAKINO Fumiyoshi, MARKOWITZ Alex, MATSUMOTO Chiho, MATSUMOTO Hironori, MATSUOKA Masaru, MATSUSHTIA Kyoko, MCCAMMON Dan, MIHARA Tatehiko, MISAKI Kazutami, MIYATA Emi, MIZUNO Tsunefumi, MORI Koji, MORI Hideyuki, MORII Mikio, MOSELEY Harvey, MUKAI Koji, MURAKAMI Hiroshi, MURAKAMI Toshio, MUSHOTZKY Richard, NAGASE Fumiaki, NAMIKI Masaaki, NEGORO Hitoshi, NAKAZAWA Kazuhiro, NOUSEK John A., OKAJIMA Takashi, OGASAKA Yasushi, OHASHI Takaya, OSHIMA Tai, OTA Naomi, OZAKI Masanobu, OZAWA Hideki, PARMAR Arvind N., PENCE William D., PORTER F. Scott, REEVES James N., RICKER George R., SAKURAI Ikuya, SANDERS Wilton T., SENDA Atsushi, SERLEMITSOS Peter, SHIBATA Ryo, SOONG Yang, SMITH Randall, SUZUKI Motoko, SZYMKOWIAK Andrew E., TAKAHASHI Hiromitsu, TAMAGAWA Toru, TAMURA Keisuke, TAMURA Takayuki, TANAKA Yasuo, TASHIRO Makoto, TAWARA Yuzuru, TERADA Yukikatsu, TERASHIMA Yuichi, TOMIDA Hiroshi, TORII Ken'ichi, TSUBOI Yohko, TSUJIMOTO Masahiro, TSURU Takeshi Go, TURNER Martin J. L., UEDA Yoshihiro, UENO Shiro, UENO Masaru, UNO Shin'ichiro, URATA Yuji, WATANABE Shin, YAMAMOTO Norimasa, YAMAOKA Kazutaka, YAMASAKI Noriko Y., YAMASHITA Koujun, YAMAUCHI Makoto, YAMAUCHI Shigeo, YAQOOB Tahir, YONETOKU Daisuke, YOSHIDA Atsumasa
PASJ : publications of the Astronomical Society of Japan
Astronomical Society of Japan
59/ 1, S1-S7
2007/01/31
00046264

URL

38 研究論文(学術雑誌)
共著
Suzaku Observations of HESS J1616-508 : Evidence for a Dark Particle Accelerator
Matsumoto Hironori, Ueno Masaru, Bamba Aya, HYODO Yoshiaki, MORI Hideyuki, UCHIYAMA Hideki, TSURU Takeshi Go, KOYAMA Katsuji, KATAOKA Jun, KATAGIRI Hideaki, TAKAHASHI Tadayuki, HIRAGA Junko, YAMAUCHI Shigeo, HUGHES John P., SENDA Atsushi, KOKUBUN Motohide, KOHMURA Takayoshi, PORTER Frederick S.
PASJ : publications of the Astronomical Society of Japan
日本天文学会
59/ 1, S199-S208
2007/01/31
00046264

URL
We observed the bright unidentified TeV γ -ray source HESS J1616-508 with the X-ray Imaging Spectrometers onboard the Suzaku satellite. No X-ray counterpart was found to a limiting flux of 3.1 × 10-13 erg s-1 cm-2 in the 2–10 keV band, which is some 60-times below the γ -ray flux in the 1–10 TeV band. This object is bright in TeV γ -rays, but very dim in the X-ray band, and thus is one of the best examples in the Galaxy of a "dark particle accelerator." We also detected soft thermal emission with kT ∼ 0.3–0.6keV near the location of HESS J1616-508. This may be due to a dust-grain scattering halo from the nearby bright supernova remnant RCW 103.
39 研究論文(学術雑誌)
共著
Detection of Gamma Rays around 1 TeV from RX J0852.0-4622 by CANGAROO-II
Katagiri, H. et al.
The Astrophysical Journal

619, L163-L165
2005



CANGAROO-II望遠鏡により、超新星残骸RX J0852.0-4622からの超高エネルギーガンマ線を検出し、その起源について、陽子または電子による可能性を議論した。