EXTERNAL COMPTON EMISSION IN BLAZARS OF NONLINEAR SYNCHROTRON SELF-COMPTON-COOLED ELECTRONS
EXTERNAL COMPTON EMISSION IN BLAZARS OF NONLINEAR SYNCHROTRON SELF-COMPTON-COOLED ELECTRONS
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DOI：
10.1088/0004-637x/761/2/110
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
M. Zacharias;R. Schlickeiser
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文献类型：
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作者：
M. Zacharias;R. Schlickeiser
耀变体光谱能量分布（SED）中高能成分的起源仍然是一个谜。虽然 BL Lac 天体可以在单区同步加速器自康普顿 (SSC) 场景中成功建模，但低峰值平坦频谱射电类星体的 SED 更难以重现。它们的高能组件需要丰富的强外部光子源，通过逆康普顿 (IC) 通道产生更强的冷却，从而成为 SED 中的强大组件。最近，我们已经能够证明，如此强大的逆康普顿组件也可以在 SSC 框架内实现。然而，这只有在电子通过 SSC 冷却时才有可能实现，这会导致非线性过程，因为冷却取决于电子的能量积分。在本文中，我们的目标是通过分析计算具有线性或非线性冷却的基础电子分布的 EC 分量，将非线性 SSC 框架与外部康普顿 (EC) 输出进行比较。由于电子与外部光子的额外线性冷却，需要更高的电子数密度来实现非线性冷却，从而产生更强大的 IC 组件。如果电子最初非线性冷却，则生成的 SED 会表现出比 EC 组件更显着的 SSC。然而，这种优势很大程度上取决于输入参数。我们的结论是，通过正确的时间依赖性处理，在耀斑耀斑建模中应考虑 SSC 成分。
The origin of the high-energy component in spectral energy distributions (SEDs) of blazars is still something of a mystery. While BL Lac objects can be successfully modeled within the one-zone synchrotron self-Compton (SSC) scenario, the SED of low-peaked flat spectrum radio quasars is more difficult to reproduce. Their high-energy component needs the abundance of strong external photon sources, giving rise to stronger cooling via the inverse Compton (IC) channel, and thus to a powerful component in the SED. Recently, we have been able to show that such a powerful inverse Compton component can also be achieved within the SSC framework. This, however, is only possible if the electrons cool by SSC, which results in a nonlinear process, since the cooling depends on an energy integral over the electrons. In this paper, we aim to compare the nonlinear SSC framework with the external Compton (EC) output by calculating analytically the EC component with the underlying electron distribution being either linearly or nonlinearly cooled. Due to the additional linear cooling of the electrons with the external photons, higher number densities of electrons are required to achieve nonlinear cooling, resulting in more powerful IC components. If the electrons initially cool nonlinearly, the resulting SED can exhibit a dominant SSC over the EC component. However, this dominance depends strongly on the input parameters. We conclude that, with the correct time-dependent treatment, the SSC component should be taken into account in modeling blazar flares.