MAXI J1348-630减速喷流中电子加速的辐射特征
Radiation Signatures of Electron Acceleration in the Decelerating Jet of MAXI J1348-630
AI总结：
针对MAXI J1348-630 2019/2020年爆发中喷流团块减速时电子加速的辐射特征，引入含过渡层的相对论激波模型模拟减速，得到与观测匹配的多波长辐射特征，解决了原动能估计过高问题。
摘要：
在低质量X射线双星MAXI J1348-630的2019/2020年爆发期间，观测到一个离散喷流成分（团块）的抛射及其随后的减速。由于从排空空腔突然过渡到星际介质导致减速的首次运动学分析表明，其动能超过10^46 erg，超过可用总抛射能量的估计值。然而，最近在空腔和星际介质之间加入密度呈指数增长的过渡层后，运动学分析得出了更现实的能量需求，约为10^44 erg。本文通过引入类似于伽马射线暴相对论激波模型的模型，考虑辐射能量损失和辐射阻力，模拟相对论运动等离子体团的减速，研究减速团块中电子加速的预期辐射特征。该模型产生了同步辐射和同步自康普顿（SSC）发射的快照光谱能量分布和多波长光变曲线。值得注意的是，同步辐射在X射线波段达到峰值，预测的射电和X射线光变曲线与2019/2020年爆发后喷流减速阶段的观测结果非常相似。
英文摘要：
A discrete jet component (blob) ejection and its subsequent deceleration was observed in the 2019/2020 outburst in the low-mass X-ray binary MAXI J1348-630. A first kinematic analysis of the deceleration due to an abrupt transition from an evacuated cavity to the interstellar medium suggested a kinetic energy exceeding 1046 erg, surpassing estimates of the available total ejection energy. However, incorporating a transition layer with exponential density growth between the cavity and interstellar medium recently enabled a kinematic analysis with much more realistic energy requirements of approximately $10^{44}$ erg. Here, we study the expected radiative signatures of electrons accelerated within the decelerating blob by introducing a model akin to the relativistic blast wave model for gamma-ray bursts, considering radiative energy losses and radiation drag, to simulate the deceleration of a relativistically moving plasmoid. This model yields snap-shot spectral energy distributions and multi-wavelength light curves from synchrotron and Synchrotron-Self-Compton (SSC) emission. Notably, the synchrotron emission peaks in the X-rays, and the predicted Radio and X-ray light curves closely resemble the observed ones during the jet decleration phase following the outburst in 2019/2020.
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