The Synchrotron Emission Pattern of Intrabinary Shocks
The Synchrotron Emission Pattern of Intrabinary Shocks
复制标题
双星内激波的同步辐射模式
作者：
D. Kandel;R. Romani;H. An
我们在黑寡妇和红背系统中模拟毫秒脉冲星风与辐射驱动的伴风碰撞。对于红背星，这种双星内激波（IBS）的几何形状对脉冲星外流中预期的赤道浓度相当敏感。因此，我们分析扩展IBS薄激波模型脉冲星风。我们计算同步辐射从这样的冲击，包括建设和冷却的粒子人口，因为它加速沿着IBS。对于合理的参数，这IBS通量占主导地位的X射线波段的二进制发射。建模显示了IBS峰上光谱的细微变化，可用于敏感的X射线研究。作为示例应用程序，我们适合档案CXO/XMM数据从黑寡妇脉冲星J1959+2048和红背PSR J2339-0533，发现该模型再现轨道光变曲线轮廓和能谱。结果显示了一个非常硬的注入电子光谱，表明可能的主导地位的重联。光变曲线拟合对几何参数敏感，其中包括非常重要的轨道倾角i。再加上伴星星星的光学拟合，这种IBS X射线光变曲线模型可以强烈地约束毫秒脉冲星风的双星几何和能量。
We model millisecond pulsar winds colliding with radiatively driven companion winds in black widow and redback systems. For the redbacks, the geometry of this intrabinary shock (IBS) is quite sensitive to the expected equatorial concentration in the pulsar outflow. We thus analytically extend IBS thin-shock models to pulsar winds. We compute the synchrotron emission from such shocks, including the buildup and cooling of the particle population as it accelerates along the IBS. For reasonable parameters, this IBS flux dominates the binary emission in the X-ray band. The modeling shows subtle variation in spectrum across the IBS peak, accessible to sensitive X-ray studies. As example applications, we fit archival CXO/XMM data from the black widow pulsar J1959+2048 and the redback PSR J2339–0533, finding that the model reproduces well the orbital light-curve profiles and energy spectra. The results show a very hard injected electron spectrum, indicating likely dominance by reconnection. The light-curve fitting is sensitive to the geometric parameters, including the very important orbital inclination i. Coupled with optical fits of the companion star, such IBS X-ray light-curve modeling can strongly constrain the binary geometry and the energetics of the millisecond pulsar wind.