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arXiv 1602.07896astro-ph.HE
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FR II星系热点中的粒子加速和磁场放大:4C74.26个例研究

Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: The case study 4C74.26

Anabella T. Araudo, Anthony R. Bell, Katherine M. Blundell

摘要:

有人认为,河外源的相对论性激波可能会加速能量最高的宇宙射线。然而,最近的理论进展表明,相对论冲击可能无法将粒子加速到比PeV大得多的能量,这让人怀疑。在目前的贡献中,我们在类星体4C74.26的南部热点无线电X射线发射模型。用MERLIN射电干涉仪在激波附近分辨出同步辐射,激波后辐射的快速衰减被解释为下游磁场的衰减,正如小尺度湍流所预期的那样。如果我们的结果被其他射电星系的分析所证实,它提供了坚定的观测证据,在FR II射电星系中强大喷流的终端区域的相对论激波不加速超高能宇宙射线。

英文摘要:

It has been suggested that relativistic shocks in extragalactic sources may accelerate the most energetic cosmic rays. However, recent theoretical advances indicating that relativistic shocks are probably unable to accelerate particles to energies much larger than a PeV cast doubt on this. In the present contribution we model the radio to X-ray emission in the southern hotspot of the quasar 4C74.26. The synchrotron radio emission is resolved near the shock with the MERLIN radio-interferometer, and the rapid decay of this emission behind the shock is interpreted as the decay of the downstream magnetic field as expected for small scale turbulence. If our result is confirmed by analyses of other radiogalaxies, it provides firm observational evidence that relativistic shocks at the termination region of powerful jets in FR II radiogalaxies do not accelerate ultra high energy cosmic rays.

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