论文标题
不透明度对芯换和射流的光谱特性的影响
Opacity effect on core-shift and the spectral properties of jets
论文作者
论文摘要
有理论和观察性的证据表明，射流核心位置随频率而变化。但是，在耀斑的情况下，给定频率的核心位置可能会随时间而变化。在这项工作中，我们希望探索核心位置的变化，这是频率，磁场比对，相对论电子密度和射流倾斜角的函数的变化。我们使用同步发射喷气机的物理模型。分析了两个射流的情况，即与磁场平行，垂直于射流轴。相关光谱的演变在无线电频带上进行监测。我们发现，较小的射流倾斜角或较高的电子密度会导致射流核心位置向下移动射流，我们证明了沿射流的芯的位移会导致光谱变平。
There is theoretical and observational evidence that the jet core position changes with frequency. However, the core position for a given frequency may vary with time in the case of flares or for a precessing jet. In this work, we want to explore the changes in core position as a function of frequency, magnetic field alignment, relativistic electron density, and jet inclination angle. We use a physical model of a synchrotron-emitting jet. Two cases of the jet are analysed, namely with magnetic field parallel and perpendicular to the jet axis. The evolution of the related spectrum is monitored over the radio band. We find that a smaller jet inclination angle or a higher electron density causes the jet core position to move downstream of the jet and we demonstrate that this displacement of the core along the jet gives rise to a spectral flattening.
