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arXiv 0707.3502astro-ph
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INTEGRAL和耀变体爆发的快速观测

INTEGRAL and Swift Observations of Blazars in Outburst

Elena Pian, Luigi Foschini, Gabriele Ghisellini

摘要:

耀变体3C 454.3、PKS 0537-441和PKS 2155-304通常被认为是这类最活跃的源。它们能发射所有的频率,直到伽马射线,是探测多波长核变异性的好探针。前两者也具有发光的宽发射线区域。我们最近用各种设备,包括雨燕和INTEGRAL,监测它们,并用来自相对论性喷流的非热辐射模型解释它们的变化。特别是,我们已经测试了前两个来源的假设,即通过内部冲击,即相对论性等离子体斑点的碰撞的射流内产生的可变性。这允许将所有物理量参数化为体洛伦兹因子的函数。我们作出了一个关键的假设,即每一次耀斑发作都具有一定的能量。该模型再现辉煌的多波长数据,特别是伽马射线光谱,当可用的。该模型不适用于PKS 2155-304,其变异性是由少数单个参数的独立变化引起的。

英文摘要:

The blazars 3C 454.3, PKS 0537-441 and PKS 2155-304 are traditionally known to be among the most active sources of this class. They emit at all frequencies, up to the gamma-rays, and are good probes of multiwavelength nuclear variability. The first two have also luminous broad emission line regions. We have recently monitored them with various facilities, including Swift and INTEGRAL, and have interpreted their variations with models of non-thermal radiation from a relativistic jet. In particular, we have tested for the first two sources the hypothesis that the variability is produced within the jet through internal shocks, i.e. collisions of relativistic plasma blobs. This allows a parameterization of all physical quantities as functions of the bulk Lorentz factor. We have made the critical assumption that every flaring episode is characterized by a fixed amount of energy. The model reproduces brilliantly the multiwavelength data and especially the gamma-ray spectra, when available. The model is not applicable to PKS 2155-304, the variability of which is caused by independent variations of few individual parameters.

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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