Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Takashi Ohsugi"'
Autor:
Takashi Ohsugi, Tatsuya Nakaoka, Grzegorz Madejski, Koji S. Kawabata, Yuka Kanda, Miho Kawabata, Hiroshi Akitaya, Krzysztof Nalewajko, Mahito Sasada, Yasushi Fukazawa, Kensei Shiki, Masayuki Yamanaka, Katsutoshi Takaki, Takahiro Ui, Yasuyuki T. Tanaka, Ryosuke Itoh, Koji Takata, Makoto Uemura, Frank K. Schinzel, Yuki Moritani, Michitoshi Yoshida
Blazars are highly variable active galactic nuclei which emit radiation at all wavelengths from radio to gamma-rays. Polarized radiation from blazars is one key piece of evidence for synchrotron radiation at low energies and it also varies dramatical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3b0e9a67474f8f583cb4a28a98c3452
Autor:
Shuji Sato, Takashi Ohsugi, Akira Arai, Ryosuke Ito, Makoto Uemura, Masayuki Yamanaka, Y. Ikejiri, Koji S. Kawabata, Yasushi Fukazawa, Mahito Sasada, Masaru Kino, Michitoshi Yoshida, K. Sakimoto
Publikováno v:
Scopus-Elsevier
We report on the correlation between the flux, color and polarization variations on time scales of days--months in blazars, and discuss their universal aspects. We performed monitoring of 42 blazars in the optical and near-infrared bands from 2008 to
Autor:
Shingo Chiyonobu, Masaru Kino, Taichi Kato, Akira Arai, Hiroyuki Maehara, Hiromitsu Takahashi, Kenshi Yanagisawa, Michitoshi Yoshida, Takashi Ohsugi, Kazuhiro Nakajima, Kiichi Okita, Koji S. Kawabata, Osamu Nagae, Takuya Yamashita, Makoto Uemura, Tsunefumi Mizuno, Kozo Sadakane, Yasushi Fukazawa, Hideaki Katagiri, Masahiro Kitagawa, Seiichiro Kiyota, Shuji Sato, Mizuki Isogai
Publikováno v:
Publications of the Astronomical Society of Japan. 62:1103-1108
We present optical and near-infrared (NIR) photometry of a classical nova, V2362 Cyg (= Nova Cygni 2006). V2362 Cyg experienced a peculiar rebrightening with a long duration from 100 to 240 d after the maximum of the nova. Our multicolor observation
Autor:
Risako Matsui, Taichi Kato, Hiroyuki Tanaka, Daisaku Nogami, Mahito Sasada, Takashi Ohsugi, Koji S. Kawabata, A. Imada, M. Isogai, Yasushi Fukazawa, Kaori Kubota, Osamu Nagae, Masaru Kino, Shota Oizumi, Toshihiro Omodaka, Shuji Sato, Y. Moritani, T. Uehara, Hisashi Miyamoto, Makoto Uemura, Akira Arai, Hiroyuki Maehara, Takuya Yamashita
Publikováno v:
Publications of the Astronomical Society of Japan. 62:187-199
We report the observation of a new dwarf nova, OT J055717+683226, during its first-ever recorded superoutburst in December 2006. Our observation shows that this object is an SU UMa-type dwarf nova having a very short superhump period of 76.67+/- 0.03
Publikováno v:
Journal of Photopolymer Science and Technology. 22(Number 4):441-445
Hyperbranched poly (ether sulfone)s with imidazolium salts at the termini (HBPES-Im) was synthesized by polycondensation of AB2 type monomers and terminal modification using cation exchange reaction. Then, poly (ether ether ether sulfone)s with imida
Autor:
Makoto Uemura, M. Isogai, Mahito Sasada, Koji S. Kawabata, Masaru Kino, Akira Arai, Yasushi Fukazawa, Takuya Yamashita, Shuji Sato, Takashi Ohsugi
Publikováno v:
Publications of the Astronomical Society of Japan. 60:L37-L41
We present the result of near-infrared and optical observations of the BL Lac object S5 0716$ + $714 carried out by the KANATA telescope. S5 0716$ + $714 has both a long term high-amplitude variability and a short-term variability within a night. The
Autor:
Xin Liping, Ryo Yamazaki, Takashi Ohsugi, Yulei Qiu, Goro Sato, Takuya Yamashita, Takashi Miyata, Koji S. Kawabata, WeiKang Zheng, Takao Soyano, Tsutomu Aoki, Makoto Uemura, Wing-Huen Ip, Kuiyun Huang, Yoshikazu Nakada, Jian-Yan Wei, Makoto Tashiro, Jinsong Deng, Takanori Sakamoto, Yi-Hsi Lee, Yuji Urata, Kunihito Ioka, Ken'ichi Tarusawa, Hiroyuki Mito
Publikováno v:
The Astrophysical Journal. 668:L95-L98
We study the ``normal'' decay phase of the X-ray afterglows of gamma-ray bursts (GRBs), which follows the shallow decay phase, using the events simultaneously observed in the R-band. The classical external shock model -- in which neither the delayed
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 579:628-632
A two-dimensional readout micro-strip sensor processed with single-sided silicon processes has been designed and fabricated. Both p+(X) and n+(Y) electrodes are placed on one side. The n+ electrode is surrounded with the p+ strips to make isolation o
Publikováno v:
Publications of the Astronomical Society of Japan. 58:103-112
We combined spatially resolved Chandra data with the ROSAT data to constrain the dark-matter distribution in the galaxy group NGC 5044. Within 250h−1 50 kpc, the total mass is found to be ∼ 1.6× 1013M , 12% of which constitutes baryonic mass. Wi
Autor:
S. Yoshida, Takashi Ohsugi
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 541:412-420
Since diagnostic X-rays have been proven to be a cause of cancer, some precautions are essential to reduce the dose delivered to patients. In this paper, an idea to reduce the dose by a new type of X-ray computed tomography (CT) using silicon strip d