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634 results on '"Nakase, T."'

1. Search for VHE gamma rays from SS433/W50 with the CANGAROO-II telescope

Author

Hayashi, Sei., Kajino, F., Naito, T., Asahara, A., Bicknell, G. V., Clay, R. W., Doi, Y., Edwards, P. G., Enomoto, R., Gunji, S., Hara, S., Hara, T., Hattori, T., Itoh, C., Kabuki, S., Katagiri, H., Kawachi, A., Kifune, T., Ksenofontov, L. T., Kubo, H., Kurihara, T., Kurosaka, R., Kushida, J., Matsubara, Y., Miyashita, Y., Mizumoto, Y., Mori, M., Mori, H., Muraishi, H., Muraki, Y., Nakase, T., Nishida, D., Nishijima, K., Ohishi, M., Okumura, K., Patterson, J. R., Protheroe, R. J., Sakamoto, N., Sakurazawa, K., Swaby, D. L., Tanimori, T., Tanimura, H., Thornton, G., Tokanai, F., Tsuchiya, K., Uchida, T., Watanabe, S., Yamaoka, T., Yanagita, S., Yoshida, T., and Yoshikoshi, T.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

SS433, located at the center of the supernova remnant W50, is a close proximity binary system consisting of a compact star and a normal star. Jets of material are directed outwards from the vicinity of the compact star symmetrically to the east and west. Non-thermal hard X-ray emission is detected from lobes lying on both sides. Shock accelerated electrons are expected to generate sub-TeV gamma rays through the inverse-Compton process in the lobes. Observations of the western X-ray lobe region of SS433/W50 system have been performed to detect sub-TeV gamma-rays using the 10m CANGAROO-II telescope in August and September, 2001, and July and September, 2002. The total observation times are 85.2 hours for ON source, and 80.8 hours for OFF source data. No significant excess of sub-TeV gamma rays has been found at 3 regions of the western X-ray lobe of SS433/W50 system. We have derived 99% confidence level upper limits to the fluxes of gamma rays and have set constraints on the strengths of the magnetic fields assuming the synchrotron/inverse-Compton model for the wide energy range of photon spectrum from radio to TeV. The derived lower limits are 4.3 microgauss for the center of the brightest X-ray emission region and 6.3 microgauss for the far end from SS433 in the western X-ray lobe. In addition, we suggest that the spot-like X-ray emission may provide a major contribution to the hardest X-ray spectrum in the lobe., Comment: 7 pages, 8 figures, to be published in Astroparticle Physics

Published
2009
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2. Observation of gamma-rays greater than 10 TeV from Markarian 421

Author

Okumura, K., Asahara, A., Bicknell, G. V., Edwards, P. G., Enomoto, R., Gunji, S., Hara, S., Hara, T., Hayashi, S., Itoh, C., Kabuki, S., Kajino, F., Katagiri, H., Kataoka, J., Kawachi, A., Kifune, T., Kubo, H., Kushida, J., Maeda, S., Maeshiro, A., Matsubara, Y., Mizumoto, Y., Mori, M., Moriya, M., Muraishi, H., Muraki, Y., Naito, T., Nakase, T., Nishijima, K., Ohishi, M., Patterson, J. R., Sakurazawa, K., Suzuki, R., Swaby, D. L., Takano, K., Takano, T., Tanimori, T., Tokanai, F., Tsuchiya, K., Tsunoo, H., Uruma, K., Watanabe, A., Yanagita, S., Yoshida, T., and Yoshikoshi, T.

Subjects
Astrophysics
Abstract

We have observed Markarian 421 in January and March 2001 with the CANGAROO-II imaging Cherenkov telescope during an extraordinarily high state at TeV energies. From 14 hours observations at very large zenith angles, $\sim70^\circ$, a signal of 298 $\pm$ 52 gamma-ray--like events (5.7 $\sigma$) was detected at $E>10$ TeV, where a higher sensitivity is achieved than those of usual observations near the zenith, owing to a greatly increased collecting area. Under the assumption of an intrinsic power-law spectrum, we derived a differential energy spectrum $dN/dE = (3.3 \pm 0.9_{stat.} \pm 0.3_{syst.})\times10^{-13} (E/10 {Te V})^{-(4.0 ^{+0.9}_{-0.6}_{stat.} \pm 0.3_{syst.})}$ ph./cm$^2$/sec/TeV, which is steeper than those previously measured around 1 TeV, and supports the evidence for a cutoff in the spectrum of Markarian 421. However, the 4 $\sigma$ excess at energies greater than 20 TeV in our data favors a cutoff energy of $\sim$8 TeV, at the upper end of the range previously reported from measurements at TeV energies., Comment: 13 pages, 4 figures, to appear in Astrophisical Journal Letters

Published
2002
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3. Search for gamma-rays above 10 TeV from Markarian 421 in a high state with the CANGAROO-II telescope

Author

Okumura, K., Enomoto, R., Asahara, A., Bicknell, G. V., Edwards, P. G., Gunji, S., Hara, S., Hara, T., Hayashi, S., Itoh, C., Kabuki, S., Kajino, F., Katagiri, H., Kataoka, J., Kawachi, A., Kifune, T., Kubo, H., Kushida, J., Maeda, S., Maeshiro, A., Matsubara, Y., Mizumoto, Y., Mori, M., Moriya, M., Muraishi, H., Muraki, Y., Naito, T., Nakase, T., Nishijima, K., Ohishi, M., Patterson, J. R., Sakurazawa, K., Suzuki, R., Swaby, D. L., Takano, K., Takano, T., Tanimori, T., Tokanaia, F., Tsuchiya, K., Tsunoo, H., Uruma, K., Watanabe, A., Yanagita, S., Yoshida, T., and Yoshikoshi, T.

Subjects
Astrophysics
Abstract

A preliminary result from Markarian 421 observations in the energy region above 10 TeV with the CANGAROO-II 10 m telescope is presented. In January 2001, the HEGRA group reported that Markarian 421 had become very active, with flux levels up to 4 times that of the Crab Nebula. As a result, we observed Mkn 421 during six nights from January 24th to February 1st, and four nights from March 1st to 4th. Observations were carried out using the very large zenith angle technique ($\sim$70 degree) and the energy threshold is estimated from Monte Carlo simulations to be around 10 TeV. We have detected gamma-ray emission in this energy range., Comment: 4 pages, 5 figures, to appear in Proc. 27th ICRC (Hamburg, Germany)

Published
2001

4. The CANGAROO-III Project: Status report

Author

Mori, M., Asahara, A., Bicknell, G. V., Clay, R. W., Edwards, P. G., Enomoto, R., Gunji, S., Hara, S., Hara, T., Hayashi, S., Itoh, C., Kabuki, S., Kajino, F., Katagiri, H., Kawachi, A., Kifune, T., Kubo, H., Kushida, J., Maeda, S., Maeshiro, A., Matsubara, Y., Mizumoto, Y., Muraishi, H., Muraki, Y., Naito, T., Nakase, T., Nishijima, K., Ohishi, M., Okumura, K., Patterson, J. R., Protheroe, R. J., Sakurazawa, K., Suzuki, R., Swaby, D. L., Tanimori, T., Tokanai, F., Tsuchiya, K., Tsunoo, H., Uruma, K., Watanabe, A., Yanagita, S., Yoshida, T., and Yoshikoshi, T.

Subjects
Astrophysics
Abstract

We report on the status of the construction of an array of four 10 m atmospheric Cherenkov telescopes for gamma-ray astronomy, near Woomera, in South Australia -- the CANGAROO-III project. The first telescope of this array is the upgraded version of the CANGAROO-II 7 m telescope and has been in operation since March 2000. The second telescope, an improved version of the first, is being constructed for installation in late 2001. Stereoscopic observation of sub TeV gamma-rays with the two 10 m telescopes will begin in 2002 and the full array will be operational in 2004., Comment: 4 pages, 7 figures, to appear in Proc. 27th ICRC (Hamburg, Germany)

Published
2001

6. Very high energy gamma-ray observations of the Galactic Plane with the CANGAROO-III telescopes

Author

Ohishi, M., Mori, M., Adachi, Y., Asahara, A., Bicknell, G.V., Clay, R.W., Doi, Y., Edwards, P.G., Enomoto, R., Gunji, S., Hara, S., Hara, T., Hattori, T., Hayashi, Sei., Higashi, Y., Hirai, Y., Inoue, K., Itoh, C., Kabuki, S., Kajino, F., Katagiri, H., Kawachi, A., Kifune, T., Kiuchi, R., Kubo, H., Kurihara, T., Kurosaka, R., Kushida, J., Matsubara, Y., Miyashita, Y., Mizukami, T., Mizuniwa, R., Muraishi, H., Muraki, Y., Naito, T., Nakamori, T., Nakano, S., Nakase, T., Nishida, D., Nishijima, K., Sakamoto, N., Sakamoto, Y., Sato, M., Seki, A., Stamatescu, V., Suzuki, T., Swaby, D.L., Tanimori, T., Tanimura, H., Thornton, G.J., Tokanai, F., Tsuchiya, K., Watanabe, S., Yamada, Y., Yamaoka, T., Yamazaki, E., Yanagita, S., Yoshida, T., Yoshikoshi, T., and Yukawa, Y.

Published
2008
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19. The acceleration of cosmic-ray protons in the supernova remnant RX J1713.7-3946

Author

Enomoto, R., Tanimori, T., Naito, T., Yoshida, T., Yanagita, S., Mori, M., Edwards, P. G., Asahara, A., Bicknell, G. V., Gunji, S., Hara, S., Hara, T., Hayashi, S., Itoh, C., Kabuki, S., Kajino, F., Katagiri, H., Kataoka, J., Kawachi, A., Kifune, T., Kubo, H., Kushida, J., Maeda, S., Maeshiro, A., Matsubara, Y., Mizumoto, Y., Moriya, M., Muraishi, H., Muraki, Y., Nakase, T., Nishijima, K., Ohishi, M., Okumura, K., Patterson, J. R., Sakurazawa, K., Suzuki, R., Swaby, D. L., Takano, K., Takano, T., Tokanai, F., Tsuchiya, K., Tsunoo, H., Uruma, K., Watanabe, A., and Yoshikoshi, T.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): R. Enomoto (corresponding author) [1]; T. Tanimori [2]; T. Naito [3]; T. Yoshida [4]; S. Yanagita [4]; M. Mori [1]; P. G. Edwards [5]; A. Asahara [2]; G. V. [...]

Published
2002
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23. Status of the CANGAROO-III project

Author

Kubo, H., Asahara, A., Bicknell, G.V., Clay, R.W., Doi, Y., Edwards, P.G., Enomoto, R., Gunji, S., Hara, S., Hara, T., Hattori, T., Hayashi, Sei., Itoh, C., Kabuki, S., Kajino, F., Katagiri, H., Kawachi, A., Kifune, T., Ksenofontov, L.T., Kurihara, T., Kurosaka, R., Kushida, J., Matsubara, Y., Miyashita, Y., Mizumoto, Y., Mori, M., Moro, H., Muraishi, H., Muraki, Y., Naito, T., Nakase, T., Nishida, D., Nishijima, K., Ohishi, M., Okumura, K., Patterson, J.R., Protheroe, R.J., Sakamoto, N., Sakurazawa, K., Swaby, D.L., Tanimori, T., Tanimura, H., Thornton, G., Tokanai, F., Tsuchiya, K., Uchida, T., Watanabe, S., Yamaoka, T., Yanagita, S., Yoshida, T., and Yoshikoshi, T.

Published
2004
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32. Development of an atmospheric Cherenkov imaging camera for the CANGAROO-III experiment

Author

Kabuki, S., Tsuchiya, K., Okumura, K., Enomoto, R., Uchida, T., Tsunoo, H., Hayashi, Shin., Hayashi, Sei., Kajino, F., Maeshiro, A., Tada, I., Itoh, C., Asahara, A., Bicknell, G.V., Clay, R.W., Edwards, P.G., Gunji, S., Hara, S., Hara, T., Hattori, T., Katagiri, H., Kawachi, A., Kifune, T., Kubo, H., Kushida, J., Matsubara, Y., Mizumoto, Y., Mori, M., Moro, H., Muraishi, H., Muraki, Y., Naito, T., Nakase, T., Nishida, D., Nishijima, K., Ohishi, M., Patterson, J.R., Protheroe, R.J., Sakurazawa, K., Swaby, D.L., Tanimori, T., Tokanai, F., Watanabe, A., Watanabe, S., Yanagita, S., Yoshida, T., and Yoshikoshi, T.

Published
2003
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35. Design study of CANGAROO-III, stereoscopic imaging atmospheric Cherenkov telescopes for sub-TeV γ-ray detection

Author

Enomoto, R, Hara, S, Asahara, A, Bicknell, G.V, Edwards, P.G, Gunji, S, Hara, T, Jimbo, J, Kajino, F, Katagiri, H, Kataoka, J, Kawachi, A, Kifune, T, Kubo, H, Kushida, J, Matsubara, Y, Mizumoto, Y, Mori, M, Moriya, M, Muraishi, H, Muraki, Y, Naito, T, Nakase, T, Nishijima, K, Okumura, K, Patterson, J.R, Sakurazawa, K, Swaby, D.L, Takano, K, Tanimori, T, Tamura, T, Tsuchiya, K, Uruma, K, Yanagita, S, Yoshida, T, Yoshikoshi, T, and Yuki, A

Published
2002
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36. Mechanism of surface magnetization by friction of ferromagnetic materials.

Author

Mishina, H., Hase, A., Nakase, T., and Dohi, M.

Subjects
MAGNETIZATION, FRICTION, FERROMAGNETIC materials, MAGNETIC fields, ELECTROMAGNETIC induction, MAGNETIC domain, MAGNETIC force microscopy
Abstract

Experiments showed that in the absence of an external magnetic field, the ferromagnetic materials Ni and Co undergo spontaneous magnetization of their frictional sliding surfaces as a result of tribological actions such as friction and wear. The magnetization phenomenon on the sliding surface was confirmed by measurements of the magnetic flux density and measurements of magnetic forces with a magnetic force microscopy. The mechanism of spontaneous magnetization by tribological action (tribomagnetization) is discussed in relation to the formation of elemental wear debris with a size of a few tens of nanometers, a size that is of the same order as that of a single magnetic domain particle, and of transfer particles that are formed by accumulation of debris adhering to the sliding surface in tribological processes. [ABSTRACT FROM AUTHOR]

Published
2009
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42. A search for TeV gamma-ray emission from the PSR B1259-63/SS 2883 binary system with the CANGAROO-II 10 meter telescope

Author

河内, 明子, 内藤, 統也, Patterson, J. R., Edwards, P. G., 浅原, 明広, Bicknell, G. V., Clay, R. W., 榎本, 良治, 郡司, 修一, 原, 敏, 原, 忠生, 服部, 敬裕, 林, 清一, 林, 慎一郎, 伊藤, 千枝, 株木, 重人, 梶野, 文義, 片桐, 秀明, 木船, 正, Ksenofontov, L., 窪, 秀利, 櫛田, 淳子, 松原, 豊, 水本, 好彦, 森, 正樹, 茂呂, 寿子, 村石, 浩, 村木, やすし, 中瀬, 友和, 西田, 大輔, Kawachi, Akiko, Naito, T., Asahara, A., Enomoto, R., Gunji, S., Hara, S., Hara, T., Hattori, T., Hayashi, Seiichi, Hayashi, Shin'ichiro, Itoh, Chie, Kabuki, S., Kajino, F., Katagiri, H., Kifune, T., Kubo, Hidetoshi, Kushida, J., Matsubara, Y., Mizumoto, Y., Mori, M., Moro, H., Muraishi, H., Muraki, Y., Nakase, T., Nishida, D., 河内, 明子, 内藤, 統也, Patterson, J. R., Edwards, P. G., 浅原, 明広, Bicknell, G. V., Clay, R. W., 榎本, 良治, 郡司, 修一, 原, 敏, 原, 忠生, 服部, 敬裕, 林, 清一, 林, 慎一郎, 伊藤, 千枝, 株木, 重人, 梶野, 文義, 片桐, 秀明, 木船, 正, Ksenofontov, L., 窪, 秀利, 櫛田, 淳子, 松原, 豊, 水本, 好彦, 森, 正樹, 茂呂, 寿子, 村石, 浩, 村木, やすし, 中瀬, 友和, 西田, 大輔, Kawachi, Akiko, Naito, T., Asahara, A., Enomoto, R., Gunji, S., Hara, S., Hara, T., Hattori, T., Hayashi, Seiichi, Hayashi, Shin'ichiro, Itoh, Chie, Kabuki, S., Kajino, F., Katagiri, H., Kifune, T., Kubo, Hidetoshi, Kushida, J., Matsubara, Y., Mizumoto, Y., Mori, M., Moro, H., Muraishi, H., Muraki, Y., Nakase, T., and Nishida, D.

Abstract

著者人数: 46名, Accepted: 2004-02-16

Published
2015

50. Bullera Derx

Author

Boekhout, T., Bai, Y., and Nakase, T.

Published
2011

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