Y. Hayashi
Osaka City University
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The Astrophysical Journal | 1998
N. Hayashida; H. Hirasawa; F. Ishikawa; H. Lafoux; M. Nagano; D. Nishikawa; T. Ouchi; H. Ohoka; M. Ohnishi; N. Sakaki; M. Sasaki; H. Shimodaira; M. Teshima; R. Torii; Tetsuya Yamamoto; Shin'ichirou Yoshida; T. Yuda; Y. Hayashi; N. Ito; S. Kawakami; Y. Kawasaki; T. Matsuyama; M. Sasano; T. Takahashi; N. Chamoto; F. Kajino; M. Sakata; T. Sugiyama; M. Tsukiji; Y. Yamamoto
We will report the observations of TeV gamma ray flares from Markarian 501 using Telescope Array Prototype. The observation were carried out continuously from the end of March to the end of July in 1997. The energy spectrum, and the time variation of the gamma ray intensities are shown. The intensity has been changed by the order of magnitude in this period and the possible quasi periodic oscillation of 12.7days were discovered.We report the observations of TeV gamma-ray flares from Markarian 501 using the Telescope Array Prototype. The observations were carried out continuously from the end of March to the end of July of 1997. The energy spectrum and the time variation of the gamma-ray intensities are shown. The intensity has been changed by an order of magnitude in this period, and the possible quasi-periodic oscillation of 12.7 days were discovered.
Astroparticle Physics | 1999
Tomohiko Yamamoto; N. Chamoto; M. Chikawa; S. Hayashi; Y. Hayashi; N. Hayashida; K. Hibino; H. Hirasawa; K. Honda; N. Hotta; N. Inoue; F. Ishikawa; N. Ito; S. Kabe; F. Kajino; Toshisuke Kashiwagi; S. Kawakami; Y. Kawasaki; N. Kawasumi; H. Kitamura; K. Kuramochi; E. Kusano; H. Lafoux; E. C. Loh; T. Matsuyama; K. Mizutani; M. Nagano; D. Nishikawa; J. Nishimura; T. Nishiyama
Abstract We have observed flares of TeV-gamma rays from Mrk501 in 1997 using three telescopes of the Utah Seven Telescope Array at Dugway, Utah. Determination of the energy spectrum from such Active Galactic Nuclei (AGN) is very important, because the gamma-ray spectrum is expected to steepen around 10 TeV from objects like Mrk501 by the interaction of the infrared photons. We have developed the method to estimate energies of the gamma rays by stereoscopic analysis using multiple telescopes. The differential index of the energy spectrum obtained is well expressed by −2.5 between 700 GeV and 3 TeV. This spectrum seems to become steeper above several TeV.
Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017) | 2017
P. K. Mohanty; K.P. Arunbabu; S. Dugad; Sourendu Gupta; B. Hariharan; Y. Hayashi; P. Jagadeesan; A. Jain; S. Kawakami; H. Kojima; S.D. Morris; A. Oshima; B.S. Rao; S. Shibata; Prasad Subramanian
The large area (560 m
Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017) | 2017
Arunbabu Kollamparambil Paul; Sourendu Gupta; S. Dugad; B. Hariharan; Y. Hayashi; P. Jagadeesan; A. Jain; S. Kawakami; H. Kojima; P. K. Mohanty; S.D. Morris; P.K. Nayak; A. Oshima; B.S. Rao; S. Shibata; Prasad Subramanian
^2
Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017) | 2017
Arunbabu Kollamparambil Paul; Shakeel Ahmad; A. Chandra; Sourendu Gupta; S. Dugad; B. Hariharan; Y. Hayashi; P. Jagadeesan; A. Jain; V.B. Jhansi; S. Kawakami; H. Kojima; P. K. Mohanty; S.D. Morris; P.K. Nayak; A. Oshima; B.S. Rao; L.V. Reddy; S. Shibata; K. Tanaka; M. Zuberi
) GRAPES-3 tracking muon telescope in Ooty, India recorded a 2 hour (h) muon burst on 22 June 2015 starting at 19:00 UT in the midst of a continuing Forbush decrease. The burst occurred following the arrival of a coronal mass ejection containing a 40 nT south-ward interplanetary magnetic field (IMF) that had triggered a G4 class geomagnetic storm. During the 2 hour, the muon telescope recorded an excess of
Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017) | 2017
Anuj Chandra; Shakeel Ahmad; K.P. Arunbabu; S. Dugad; Sourendu Gupta; B. Hariharan; Y. Hayashi; P. Jagadeesan; A. Jain; V.B. Jhansi; S. Kawakami; H. Kojima; P. K. Mohanty; S.D. Morris; P.K. Nayak; A. Oshima; B.S. Rao; L.V. Reddy; S. Shibata; M. Zuberi
sim
Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017) | 2017
P. K. Mohanty; Shakeel Ahmad; K.P. Arunbabu; A. Chandra; S. Dugad; Sourendu Gupta; B. Hariharan; Y. Hayashi; P. Jagadeesan; A. Jain; V.B. Jhansi; S. Kawakami; H. Kojima; S.D. Morris; P.K. Nayak; A. Oshima; B.S. Rao; L.V. Reddy; S. Shibata; Prasad Subramanian; M. Zuberi
10
Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017) | 2017
Haran Hari Balakrishnan; S. Dugad; Sourendu Gupta; Y. Hayashi; P. Jagadeesan; A. Jain; S. Kawakami; P. K. Mohanty; B.S. Rao
^{6}
Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017) | 2017
Bhavani Jhansi Vuta; Shakeel Ahmad; K.P. Arunbabu; A. Chandra; S. Dugad; Sourendu Gupta; B. Hariharan; Y. Hayashi; P. Jagadeesan; A. Jain; S. Kawakami; H. Kojima; P. K. Mohanty; S.D. Morris; A. Oshima; B.S. Rao; L.V. Reddy; P.K. Nayak; S. Shibata; M. Zuberi
muons with a significance of 54
Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017) | 2017
Bhavani Jhansi Vuta; Shakeel Ahmad; K.P. Arunbabu; A. Chandra; S. Dugad; Sourendu Gupta; B. Hariharan; Y. Hayashi; P. Jagadeesan; A. Jain; S. Kawakami; H. Kojima; P. K. Mohanty; S.D. Morris; P.K. Nayak; A. Oshima; B.S. Rao; L.V. Reddy; S. Shibata; M. Zuberi
sigma