On radiative acceleration in spine–sheath structured blazar jets
On radiative acceleration in spine–sheath structured blazar jets
复制标题
脊柱鞘结构耀变射流的辐射加速
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
D. Lazzati
中科院分区：
文献类型：
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作者：
A. Chhotray;F. Nappo;G. Ghisellini;O. Salafia;F. Tavecchio;D. Lazzati
有人提出耀变体喷流是结构化的，快速的脊柱被较慢的鞘或层包围。这个结构射流模型解释了它们的发射和形态的一些特性。由于它们的相对运动，一个组件产生的辐射被另一个组件放大，从而增强了两者的逆康普顿发射。辐射在共动坐标系中各向异性地发射，并引起发射等离子体反冲。如观察者坐标系所示，这对应于最快组件（脊椎）的减速和较慢组件（层）的加速。虽然脊柱的减速已经调查，在这里，我们研究的第一次鞘的加速度，并找到自洽的速度剖面解决方案的脊柱和鞘，同时占辐射冷却。我们发现，鞘层可以加速到所需的观测速度，如果它的轻子在加速区域保持活力，假设是100史瓦西半径的顺序，要求在该区域连续注入高能粒子。
It has been proposed that blazar jets are structured, with a fast spine surrounded by a slower sheath or layer. This structured jet model explains some properties of their emission and morphology. Because of their relative motion, the radiation produced by one component is seen amplified by the other, thus enhancing the inverse Compton emission of both. Radiation is emitted anisotropically in the comoving frames, and causes the emitting plasma to recoil. As seen in the observer frame, this corresponds to a deceleration of the fastest component (the spine) and an acceleration of the slower one (the layer). While the deceleration of the spine has already been investigated, here we study for the first time the acceleration of the sheath and find self-consistent velocity profile solutions for both the spine and the sheath while accounting for radiative cooling. We find that the sheath can be accelerated to the velocities required by the observations if its leptons remain energetic in the acceleration region, assumed to be of the order of 100 Schwarzschild radii, demanding continuous injection of energetic particles in that region.