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arXiv 1502.01126astro-ph.HE
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对特殊gamma -ray射电星系IC粒子加速的洞察310

Insights into the particle acceleration of a peculiar gamma -ray radio galaxy IC 310

J. Sitarek, D. Eisenacher Glawion, K. Mannheim, P. Colin, M. Kadler, R. Schultz, F. Krauß, E. Ros, U. Bach, J. Wilms

摘要:

IC 310最近被确认为伽马射线发射体,这是基于费米LAT在GeV能量下的观测和MAGIC望远镜在极高能量(VHE,E > 100 GeV)下的观测。尽管IC 310被归类为射电星系,其喷流的观测角度大于10度,但它表现出射电星系和耀变体的多波长特性,可能使其成为一个过渡天体。在2012年11月12/13日的晚上,MAGIC望远镜观测到了IC 310方向的一系列剧烈爆发,其通量倍增时间尺度快于5分钟,并且具有超过2个数量级的特殊光谱。这种快速的变化限制了发射区域的大小小于其中心黑洞引力半径的20%,挑战了通常用于解释活动星系伽马射线辐射的冲击加速模型。在这里,我们将表明,这种发射可以与脉冲星状粒子加速的电场通过磁层间隙在基地的射流。

英文摘要:

IC 310 has recently been identified as a gamma-ray emitter based on observations at GeV energies with Fermi-LAT and at very high energies (VHE, E > 100 GeV) with the MAGIC telescopes. Despite IC 310 having been classified as a radio galaxy with the jet observed at an angle > 10 degrees, it exhibits a mixture of multiwavelength properties of a radio galaxy and a blazar, possibly making it a transitional object. On the night of 12/13th of November 2012 the MAGIC telescopes observed a series of violent outbursts from the direction of IC 310 with flux-doubling time scales faster than 5 min and a peculiar spectrum spreading over 2 orders of magnitude. Such fast variability constrains the size of the emission region to be smaller than 20% of the gravitational radius of its central black hole, challenging the shock acceleration models, commonly used in explanation of gamma-ray radiation from active galaxies. Here we will show that this emission can be associated with pulsar-like particle acceleration by the electric field across a magnetospheric gap at the base of the jet.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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