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Article overview
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Relativistic Electron Shock Drift Acceleration in Low Mach Number Galaxy Cluster Shocks | Shuichi Matsukiyo
; Yutaka Ohira
; Ryo Yamazaki
; Takayuki Umeda
; | Date: |
Thu, 1 Sep 2011 02:21:52 GMT (1860kb) | Abstract: | An extreme case of electron shock drift acceleration in low Mach number
collisionless shocks is investigated as a plausible mechanism of initial
acceleration of relativistic electrons in large-scale shocks in galaxy clusters
where upstream plasma temperature is of the order of 10 keV and a degree of
magnetization is not too small. One-dimensional electromagnetic full particle
simulations reveal that, even though a shock is rather moderate, a part of
thermal incoming electrons are accelerated and reflected through relativistic
shock drift acceleration and form a local nonthermal 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 has
well defined radio relics. | Source: | arXiv, 1109.0070 | Services: | Forum | Review | PDF | Favorites |
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