作为转换器机制特征的耀变体gamma-ray光谱的极限同步截止
Ultimate synchrotron cutoff in gamma-ray spectra of blazars as a signature of the converter mechanism
摘要：
在高能天体物理学中，同步辐射的能量有一个严格的上限：$ \sim m_{\rm e} c^2 /α$，其中$α= 1/137$是精细结构常数，其值是指流体的共动坐标系。这是具有任意高初始能量的电子在磁场中转动$\sim π$角后所能发射的同步加速器光子的最大能量。如果转换器机制对喷流辐射有贡献，这个上限自然可以达到，并且可以在一些耀变体的光谱中作为GeV范围内的截止或下降而被印记。我们用数值模拟来探测辐射射流的参数范围，最终同步截止出现。我们再现的各种光谱取决于源的光度和发射站点的规模。我们还将我们的结果与EGRET blazar光谱进行了比较，以说明协议是可能的，但在统计上仍然不显着。如果预言的特征存在，那么在某些耀变体的光谱中，{ \it Fermi}应该能观察到这种特征。
英文摘要：
There is a robust upper limit on the energy of synchrotron radiation in high-energy astrophysics: $ \sim m_{\rm e} c^2 /α$, where $α= 1/137$ is the fine structure constant and the value refers to the comoving frame of the fluid. This is the maximal energy of synchrotron photons which can be emitted by an electron having an arbitrarily high initial energy after it turns by angle $\sim π$ in the magnetic field. This upper limit can be naturally reached if the converter mechanism contributes to the jet radiation and can be imprinted in spectra of some blazars as a cutoff or a dip in the GeV range. We use numerical simulations to probe the range of parameters of a radiating jet where the ultimate synchrotron cutoff appears. We reproduce the variety of spectra depending on the source luminosity and on the scale of the emission site. We also compare our results with the EGRET blazar spectra in order to illustrate that agreement is possible but still not statistically significant. The predicted feature, if it exists, should be observed by {\it Fermi} in spectra of some blazars.
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