論文 - 山本 常夏
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Coherent Radio Emission from the electron beam sudden appearance 査読あり
Krijn D. de Vries, Michael DuVernois, Masaki Fukushima, Romain Gaïor, Kael Hanson, Daisuke Ikeda, Yusuke Inome, Aya Ishihara, Takao Kuwabara, Keiichi Mase, John N. Matthews, Thomas Meures, Pavel Motloch, Izumi S. Ohta, Aongus O’Murchadha, Florian Partous, Matthew Relich, Hiroyuki Sagawa, Tatsunobu Shibata, Bokkyun Shin, Gordon Thomson, Shunsuke Ueyama, Nick van Eijndhoven, Tokonatsu Yamamoto, and Shigeru Yoshida
Physical Review D 98 ( 123020 ) 1 - 8 2018年3月
共著
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A Technique for Estimating the Absolute Gain of a Photomultiplier Tube 査読あり
M.Takahashi, Y.Inome, S.Yoshii, A.Bamba, S.Gunji, D.Hadasch, M.Hayashida, H.Katagiri, Y.Konno, H.Kubo, J.Kushida, D.Nakajima, T.Nakamori, T.Nagayoshi, K.Nishijima, S.Nozaki, D.Mazin, S.Mashuda, T. Yamamoto, T.Yoshida
Nuclear Instruments and methods in physics research section A 894 ( 21 ) 1 - 7 2018年6月
単著
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Measurement of microwave radiation from electron beam in the atmosphere 査読あり
I. S. Ohta, H. Akimune, M. Fukushima, D. Ikeda, Y. Inome, J.N. Matthews, S. Ogio, H. Sagawa, T. Sako, T. Shibata, T. Yamamoto
Nuclear Instruments and methods in physics research section A 810 44 - 50 2016年2月
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Propagation of Ultra-High-Energy Cosmic Ray Nuclei in Cosmic Magnetic Fields and Implications for Anisotropy Measurements 査読あり
Hajime Takami, Susumu Inoue, Tokonatsu Yamamoto
Astroparticle Physics 35 ( 12 ) 767 - 780 2012年7月
共著
Recent results from the Pierre Auger Observatory (PAO) indicate that the composition of ultra-high-energy cosmic rays (UHECRs) with energies above $10^{19}$ eV may be dominated by heavy nuclei. An important question is whether the distribution of arrival directions for such UHECR nuclei can exhibit observable anisotropy or positional correlations with their astrophysical source objects despite the expected strong deflections by intervening magnetic fields. For this purpose, we have simulated the propagation of UHECR nuclei including models for both the extragalactic magnetic field and the Galactic magnetic field. Assuming that only iron nuclei are injected steadily from sources with equal luminosity and spatially distributed according to the observed large scale structure in the local Universe, at the number of events published by the PAO so far, the arrival distribution of UHECRs would be consistent with no auto-correlation at 95% confidence if the mean number density of UHECR sources $n_s >~ 10^{-6}$ Mpc$^{-3}$, and consistent with no cross-correlation with sources within 95% errors for $n_s >~ 10^{-5}$ Mpc$^{-3}$. On the other hand, with 1000 events above $5.5 \times 10^{19}$ eV in the whole sky, next generation experiments can reveal auto-correlation with more than 99% probability even for $n_s <~ 10^{-3}$ Mpc$^{-3}$, and cross-correlation with sources with more than 99% probability for $n_s <~ 10^{-4}$ Mpc$^{-3}$. In addition, we find that the contribution of Centaurus A is required to reproduce the currently observed UHECR excess in the Centaurus region. Secondary protons generated by photodisintegration of primary heavy nuclei during propagation play a crucial role in all cases, and the resulting anisotropy at small angular scales should provide a strong hint of the source location if the maximum energies of the heavy nuclei are sufficiently high.
その他リンク: http://xxx.yukawa.kyoto-u.ac.jp/PS_cache/arxiv/pdf/1202/1202.2874v1.pdf
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Prototyping hexagonal light concentrators using high-reflectance specular films for the Large-Sized Telescopes of the Cherenkov Telescope Array 査読あり
A. Okumura, T.V. Dang, S. Ono, S. Tanaka, M. Hayashida, J. Hinton, H. Katagiri, K. Noda, T. Yamamoto, T. Yoshida
Journal of Instrujmentation 12 ( P12008 ) 1 - 18 2017年11月
共著
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Prospects for Cherenkov Telescope Array Observations of the Young Supernova Remnant RX J1718.7-3946 査読あり
F. Aceror, T. Nakamori, T. Yamamoto et. al. (456 in all)
Astrophysical Journal 840 ( 74 ) 1 - 14 2017年3月
共著
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Evaluation of novel PMTs of worldwide best parameters for the CTA project 査読あり
R. Mirzoyan, D. Muller, J. Hose, U. Menzel, D. Nakajima, M. Takahashi, M. Teshima, T. Toyama, T. Yamamoto
Nuclear Instruments and methods in physics research section A 845 603 - 606 2017年2月
共著
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Evaluation of Photo Multiplier Tube candidates for the Cherenkov Telescope Array 査読あり
T. Toyama, Y. Hanabata, J. Hose, U. Menzel, R. Mirzoyan, D. Nakajima, M. Takahashi, M. Teshima, T. Yamamoto
Nuclear Instruments and methods in physics research section A 787 280 - 283 2015年8月
共著
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Search for Gamma-Ray Spectral Lines from Dark Matter Annihilation up to 100 TeV toward the Galactic Center with MAGIC
MAGIC collaboration
Physical Review Letters 2023年2月
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Proton acceleration in thermonuclear nova explosions revealed by gamma rays
CTA consortumu
Nature Astronomy 2022年6月
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Multiwavelength Observations of the Blazar VER J0521+211 during an Elevated TeV Gamma-Ray State
CTA consortumu
The Astrophysical Journal 2022年6月
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Investigating the Blazar TXS 0506+056 through Sharp Multiwavelength Eyes During 2017–2019
CTA consortumu
The Astrophysical Journal 2022年3月
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A kinetics of the spinning gravitational field 査読あり
Tokonatsu Yamamoto
Publications of the Astronomical Society of Japan 73 ( 6 ) 1556 - 1562 2021年10月
出版者・発行元:Oxford University Press (OUP)
Abstract
According to the general theory of relativity, a spinning shell drags its gravitational field. Owing to this frame-dragging effect, the gravitational field rotates. The spinning field also drags particles in the field. Although this moment of force is negligibly small, its kinetics should be properly handled. In this study, we show that the spinning gravitational field generates a central force, which makes the spinning shells heavy. The observed galactic rotation is naturally described by this central force without dark matter. We describe the kinetics of the spinning field and central force.DOI: 10.1093/pasj/psab094
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Calibration and performance of the readout system based on switched capacitor arrays for the Large-Sized Telescope of the Cherenkov Telescope Array
CTA consortumu
Ground-based and Airborne Instrumentation for Astronomy VIII 2020年12月
DOI: 10.1117/12.2560018
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Design and production of segment mirrors for the large-sized telescopes of the Cherenkov Telescope Array
Tomohiro Inada, Satoshi Fukami, Koji Noda, Michiyuki Chikawa, Mika Kagaya, Hideaki Katagiri, Daniel Mazin, Koutaro Obara, Akira Okumura, Takayuki Saito, Masahiro Teshima, Tokonatsu Yamamoto, Tatsuo Yoshida, Ievgen Vovk
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV 2020年12月
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CTA 報告 161:CTA大口径望遠鏡初号機とMAGIC望遠鏡の相互較正
大谷 恵生, 阿部 日向, 稲田 知大, 今川 要, 岩村 由樹, 大石 理子, 岡 知彦, 緒方 智之, 奥村 曉, 折戸 玲子, 梶原 侑貴, 片桐 秀明, 櫛田 淳子, 窪秀 利, 郡司 修一, 小林 志鳳, 斎藤 隆之, 榊直 人, 櫻井 駿介, 高橋 満里, 高橋 光成, 立石 大, 千川 道幸, 町支 勇貴, 手嶋 政廣, 中森 健之, 生天目 康之, 西嶋 恭司, 野上 優人, 野崎 誠也, 野村 亮介, 原田 善規, 深見 哲志, 藤原 千賀己, 古田 智也, 山本 常夏, 吉越 貴紀, 吉田 龍生, 他CTA-Japanコンソーシアム
日本物理学会講演概要集 75.1 441 - 441 2020年
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CTA報告162:CTA大口径望遠鏡初号機のカメラ較正
小林 志鳳, 阿部 日向, 稲田 知大, 猪目 祐介, 今川 要, 岩村 由樹, 大石 理子, 大岡 秀行, 大谷 恵生, 岡 知彦, 岡崎 奈緒, 緒方 智之, 奥村 曉, 折戸 玲子, 梶原 侑貴, 片桐 秀明, 櫛田 淳子, 窪秀 利, 郡司 修一, 齋藤 隆之, 榊 直人, 櫻井 駿介, 鈴木 萌, 砂田 裕志, 高橋 満里, 高橋 光成, 立石 大, 田中 真伸, 田村 謙治, 千川 道幸, 町支 勇貴, 手嶋 政廣, 寺田 幸功, 門叶 冬樹, 中森 健之, 生天目 康之, 西嶋 恭司, 野上 優人, 野崎 誠也, 野田 浩司, 野村 亮介, 原田 善規, 深見 哲志, 藤原 千賀己, 古田 智也, 山本 常夏, 吉越 貴紀, 吉田 龍生, 他CTA-Japanコンソーシアム
日本物理学会講演概要集 75.1 471 - 471 2020年
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CTA報告160:CTA大口径望遠鏡初号機のモノ解析現状
野崎 誠也, 阿部 日向, 稲田 知大, 今川 要, 岩村 由樹, 大石 理子, 大谷 恵生, 岡 知彦, 緒方 智之, 奥村 曉, 折戸 玲子, 梶原 侑貴, 片桐 秀明, 櫛田 淳子, 窪 秀利, 郡司 修一, 小林 志鳳, 斎藤 隆之, 榊 直人, 櫻井 駿介, 高橋 満里, 高橋 光成, 立石 大, 千川 道幸, 町支 勇貴, 手嶋 政廣, 中森 健之, 生天目 目康之, 西嶋 恭司, 野上 優人, 野村 亮介, 原田 善規, 深見 哲志, 藤原 千賀己, 古田 智也, 山本 常夏, 吉越 貴紀, 吉田 龍生, 他CTA-Japanコンソーシアム
日本物理学会講演概要集 75.1 440 - 440 2020年
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A 100-ps Pulse Laser as a Calibration Source
Yusuke Inome, Yuji Sunada, Yuuki Choushi, Masao Ichida, Razmik Mirzoyan, Hideyuki Ohoka, Takayuki Saito, Kenji Tamura, Masahiro Teshima, Tokonatsu Yamamoto
IEEE TNS, 66 ( 8 ) 1993 - 1997 2019年8月
共著
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Prospects for Cherenkov Telescope Array Observations of the Young Supernova Remnant RX J1718.7-3946
F. Aceror, T. Nakamori, T. Yamamoto et. al. (456 in all)
The Astrophysical Journa 840 ( 74 ) 1 - 14 2017年
共著