論文

公開件数: 21 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
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.
2 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
3 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.
4
共著
22pAM-2 次世代ガンマ線望遠鏡CTAで用いる波形記録回路TARGETの時間応答特性の評価
重中 茜, 片桐 秀明, 田島 宏康, 奥村 曉, the CTA Consortium
日本物理学会講演概要集
一般社団法人日本物理学会
71/ 1
2016/03/19
2189079X

URL

5 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
6 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




7 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, 9-
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 the same modeling to be larger than ~2 × 1049 erg. The emission from Source W can also be explained with the same CR escape scenario.
8 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


9 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


10 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




11

14aSH-3 CsI結晶シンチレータを用いたコンプトンカメラγI(ガンマアイ)の開発(14aSH 光検出器・カウンター,素粒子実験領域)
加賀谷 美佳, 梅原 克典, 榎本 良治, 片桐 秀明, 村石 浩, 柳田 昭平, 吉田 龍生
日本物理学会講演概要集
一般社団法人日本物理学会
67/ 2
2012/08/24
13428349

URL

12

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

13 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。
14 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。
15

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
16 (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




17 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。
18

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.
19 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。
20 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
21 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。