RELATIVISTIC ELECTRON SHOCK DRIFT ACCELERATION IN LOW MACH NUMBER GALAXY CLUSTER SHOCKS

• 松清, 修一

  九州大学大学院総理工学研究院 : 助教 : 大気海洋環境システム学

• 大平, 豊

  高エネルギー加速器研究機構

• 山崎, 了

  青山学院大学理工学部

• 梅田, 隆行

  名古屋大学ジオスペース研究センター

抄録

An extreme case of electron shock drift acceleration (SDA) in lowMach number collisionless shocks is investigated as a plausible mechanism for the initial acceleration of relativistic electrons in large-scale shocks in galaxy clusters, where the upstream plasma temperature is of the order of 10 keV and the degree of magnetization is not too small. One-dimensional electromagnetic full particle simulations reveal that, even when a shock is rather moderate, a part of the thermal incoming electrons are accelerated and reflected through relativistic SDA and form a local non-thermal population just upstream of the shock. The accelerated electrons can self-generate local coherent waves and further be back-scattered toward the shock by those waves. This may be a scenario for the first stage of the electron shock acceleration occurring at the large-scale shocks in galaxy clusters, such as CIZA J2242.8+5301, which have well-defined radio relics.

収録刊行物

• Astrophysical Journal

  Astrophysical Journal 742 47-1-47-9, 2011-11-03

  The American Astronomical Society

キーワード

• acceleration of particles
• galaxies
• clusters
• general
• plasmas
• radio continuum
• relativistic processes
• shock waves

詳細情報

• CRID: 1050861482658363776
• NII論文ID: 120003483454
• NII書誌ID: AA00553242
• HANDLE: 2324/20259
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles