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Showing 1–5 of 5 results
Advanced filters: Author: Daisuke Yonetoku Clear advanced filters

  • Yonetoku relation provides a diagnostic for the radiation mechanism in the prompt phase of gamma-ray burst (GRB) emission. Here, Ito et al. show the reproduction of this relation in 3D hydrodynamical simulations followed by radiative transfer calculations, which suggest the photospheric emission is the dominant component in the prompt phase of GRBs.

    • Hirotaka Ito
    • Jin Matsumoto
    • Daisuke Yonetoku
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-7

  • The degree of polarization of gamma-ray bursts seems to be lower than previously thought. Gamma-ray polarimetry can reveal the emission mechanism and physical information inside the relativistic jet.

    • Daisuke Yonetoku
    News & Views
    Nature Astronomy
    Volume: 3, P: 200-201

  • Thunderstorms are thought to produce two types of high-energy emissions, terrestrial gamma-ray flashes and gamma-ray glows however due to the difficulty in their observation the exact relation between the two is still not well-understood. Here, the authors report the simultaneous detection of a gamma-ray glow and a downward terrestrial gamma-ray flash suggesting the origin of the two phenomena are related.

    • Yuuki Wada
    • Teruaki Enoto
    • Harufumi Tsuchiya
    ResearchOpen Access
    Communications Physics
    Volume: 2, P: 1-9

  • X-ray observations of the core of the Perseus cluster reveal a remarkably quiescent atmosphere in which the gas has a line-of-sight velocity dispersion of about 164 kilometres per second in the region 30–60 kiloparsecs from the central nucleus; turbulent pressure support in the gas is four per cent of the thermodynamic pressure, necessitating only a small correction to the total cluster mass determined from hydrostatic equilibrium.

    • Felix Aharonian
    • Hiroki Akamatsu
    • Abderahmen Zoghbi
    Research
    Nature
    Volume: 535, P: 117-121

  • High-resolution X-ray spectra show near-solar abundances of chromium, manganese and nickel with respect to iron in the Perseus cluster, suggesting that the progenitors of type Ia supernovae could be near- and sub-Chandrasekhar-mass white dwarfs.

    • Felix Aharonian
    • Hiroki Akamatsu
    • Abderahmen Zoghbi
    Research
    Nature
    Volume: 551, P: 478-480