The spectral energy distribution of compact jets powered by internal shocks
The spectral energy distribution of compact jets powered by internal shocks
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内激波驱动的紧凑型射流的光谱能量分布
DOI：
10.1093/mnras/stu1144
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发表时间：
2014
影响因子：
4.8
通讯作者：
J. Malzac
中科院分区：
文献类型：
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作者：
J. Malzac
由外流速度波动引起的内部激波可能为X射线双星致密喷流的射电到红外发射提供动力。内部冲击的动力学和由此产生的射流的谱能量分布（SED）是非常敏感的时间尺度和振幅的速度波动注入在射流的底部。我提出了一个新的代码，旨在模拟同步辐射的紧凑型喷气机提供动力的内部冲击。我还开发了一种半分析形式，允许将观测到的喷流SED估计为洛伦兹因子假设波动的功率谱密度（PSD）的函数。我讨论的情况下，一个正弦调制的洛伦兹因子和洛伦兹因子波动与幂律PSD形状。与模型的细节无关，对于接近闪烁噪声谱（即P（f）~1/f）的洛伦兹因子波动的PSD，获得了观察到的几乎平坦的SED。该模型还提出了一个强大的波长依赖性的变化，这是类似于在这些源中观察到的。
Internal shocks caused by fluctuations of the outflow velocity are likely to power the radio to IR emission of the compact jets of X-ray binaries. The dynamics of internal shocks and the resulting spectral energy distribution (SED) of the jet are very sensitive to the time-scales and amplitudes of the velocity fluctuations injected at the base of the jet. I present a new code designed to simulate the synchrotron emission of a compact jet powered by internal shocks. I also develop a semi-analytical formalism allowing one to estimate the observed SED of the jet as a function of the Power Spectral Density (PSD) of the assumed fluctuations of the Lorentz factor. I discuss the cases of a sine modulation of the Lorentz factor and Lorentz factor fluctuations with a power-law PSD shape. Independently of the details of the model, the observed nearly flat SEDs are obtained for PSDs of Lorentz factor fluctuations that are close to a flicker noise spectrum (i.e. P(f)~1/f). The model also presents a strong wavelength dependent variability that is similar to that observed in these sources.