High-Energy Phenomena in Accretion Flows onto Black Holes

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Other Title
  • ブラックホール降着流における高エネルギー現象
  • ブラックホール コウチャクリュウ ニ オケル コウエネルギー ゲンショウ

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Abstract

<p>Galaxies are believed to have supermassive black holes at their center. When gas falls to a black hole, it releases a large amount of gravitational energy. This energy is converted to internal energies of the gas, which leads to powerful radiations from radio to X-rays. These systems are observed as active galactic nuclei. The gas surrounding the black holes consist of collisionless plasmas where non-thermal high-energy particles are naturally produced. High-energy particles inside accretion flows can produce high-energy gamma-rays and neutrinos via hadronuclear and photohadronic interactions. We demonstrated that the photons and neutrinos from accretion flows onto supermassive black holes can reproduce a wide range of cosmic high-energy backgrounds, including X-ray to MeV gamma-ray and TeV–PeV neutrino backgrounds. Also, we are performing simulation studies dedicated to the particle accelerations in accretion flows. We found that the particle accelerations by turbulence in accretion flows can be described by a diffusion equation in energy space. This field is rapidly growing owing to the development of experimental techniques and numerical simulation methods, and we may be able to understand the sources and production mechanisms of the cosmic high-energy particles near future.</p>

Journal

  • Butsuri

    Butsuri 76 (12), 778-783, 2021-12-05

    The Physical Society of Japan

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