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Sökning: WFRF:(Ogawa Akihiro)

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1.
  • Lu, R.S., et al. (författare)
  • A ring-like accretion structure in M87 connecting its black hole and jet
  • 2023
  • Ingår i: Nature. - 0028-0836 .- 1476-4687. ; 616:7958, s. 686-690
  • Tidskriftsartikel (refereegranskat)abstract
    • The nearby radio galaxy M87 is a prime target for studying black hole accretion and jet formation1,2. Event Horizon Telescope observations of M87 in 2017, at a wavelength of 1.3 mm, revealed a ring-like structure, which was interpreted as gravitationally lensed emission around a central black hole3. Here we report images of M87 obtained in 2018, at a wavelength of 3.5 mm, showing that the compact radio core is spatially resolved. High-resolution imaging shows a ring-like structure of [Formula: see text] Schwarzschild radii in diameter, approximately 50% larger than that seen at 1.3 mm. The outer edge at 3.5 mm is also larger than that at 1.3 mm. This larger and thicker ring indicates a substantial contribution from the accretion flow with absorption effects, in addition to the gravitationally lensed ring-like emission. The images show that the edge-brightened jet connects to the accretion flow of the black hole. Close to the black hole, the emission profile of the jet-launching region is wider than the expected profile of a black-hole-driven jet, suggesting the possible presence of a wind associated with the accretion flow.
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2.
  • Norén-Nilsson, Astrid, et al. (författare)
  • Cambodia
  • 2018
  • Ingår i: Routledge Handbook of Civil Society in Asia. - 9781138655959 ; , s. 191-203
  • Bokkapitel (refereegranskat)abstract
    • This chapter argues that Cambodian civil society is young and fragile, and has been heavily dependent on international aid and reconstruction. These characteristics have largely shaped how civil society is defined domestically. Popular understanding and scholarship both typically perceive civil society to be formed by associational activities, and employ it as a lens for studying formal organizations, human rights groups, and trade unions.
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  • Ogawa, Akihiro (författare)
  • Civil Society : Past, Present, and Future
  • 2013
  • Ingår i: Critical Issues in Contemporary Japan. - London; New York : Routledge. - 9780415857444 - 9780415857451 - 9780203797594 ; , s. 51-62
  • Bokkapitel (refereegranskat)
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7.
  • Ogawa, Akihiro (författare)
  • Demanding a safer tomorrow : Japan's anti-nuclear rallies in the summer of 2012
  • 2013
  • Ingår i: Anthropology Today. - : Wiley. - 0268-540X .- 1467-8322. ; 29:1, s. 21-24
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • This article discusses Japan's nuclear energy policy and describes the anti-nuclear protest demonstrations that were held in Japan throughout the summer of 2012, including the author's personal experiences at some of these protests, illuminating the grassroots nature of the current anti-nuclear movement.
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