Jets from Subparsec to Kiloparsec Scales: A Physical Connection
Jets from Subparsec to Kiloparsec Scales: A Physical Connection
复制标题
从亚秒差距到千秒差距尺度的喷流：物理连接
DOI：
10.1086/422985
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
R. Scarpa
中科院分区：
文献类型：
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作者：
F. Tavecchio;L. Maraschi;R. Sambruna;C. Urry;C. Cheung;J. K. Gambill;R. Scarpa
钱德拉望远镜发现的千帕秒级喷流发出的明亮x射线，使我们能够深入了解大尺度喷流的物理参数。在另一个极端，对耀变体内部相对论性喷流的广泛研究，通过多波长观测，在亚秒差距尺度上获得了可比的信息。在发射区域的简单辐射模型框架中，我们比较了这两个非常不同尺度上喷流的物理参数，这些喷流是在仅有的两个经过充分研究的、由钱德拉解决了大规模发射的耀变体中进行的。值得注意的是，我们发现在两个尺度上独立导出的相对论多普勒因子和功率是一致的，这表明射流没有遭受严重的减速或耗散。此外，内部射流和外部x射线亮节的内部均分压力与射流截面成反比，正如在均分状态下自由膨胀射流的简单图中所期望的那样。
The Chandra discovery of bright X-ray emission from kiloparsec-scale jets allows insight into the physical parameters of the jet flow at large scales. At the opposite extreme, extensive studies of the inner relativistic jets in blazars with multiwavelength observations yield comparable information on subparsec scales. In the framework of simple radiation models for the emission regions we compare the physical parameters of jets on these two very different scales in the only two well-studied blazars for which large-scale emission has been resolved by Chandra. Notably, we find that the relativistic Doppler factors and powers derived independently at the two scales are consistent, suggesting that the jet does not suffer severe deceleration or dissipation. Moreover, the internal equipartition pressures in the inner jet and in the external X-ray-bright knots scale inversely with the jet cross section as expected in the simple picture of a freely expanding jet in equipartition.