Revisiting the Intrabinary Shock Model for Millisecond Pulsar Binaries: Radiative Losses and Long-Term Variability

Jaegeun Park,Chanho Kim,Hongjun An,Zorawar Wadiasingh

ASTRONOMISCHE NACHRICHTEN（2024）

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Abstract

Spectrally hard x-ray emission with double-peak light curves (LCs) and orbitally modulated gamma rays have been observed in some millisecond pulsar binaries, phenomena attributed to intrabinary shocks (IBSs). While the existing IBS model by Sim et al. (2024; Astrophysical Journal 964(2):109) successfully explains these high-energy features observed in three pulsar binaries, it neglects particle energy loss within the shock region. We refine this IBS model to incorporate radiative losses of x-ray emitting electrons and positrons and verify that the losses have insignificant impact on the observed LCs and spectra of the three binaries. Applying our refined IBS model to the x-ray bright pulsar binary PSR J1723-2837, we predict that it can be detected by the Cherenkov Telescope Array. Additionally, we propose that the long-term x-ray variability observed in XSS J12270-4859 and PSR J1723-2837 is due to changes in the shape of their IBSs. Our modeling of the x-ray variability suggests that these IBS shape changes may alter the extinction of the companion's optical emission, potentially explaining the simultaneous optical and x-ray variability observed in XSS J12270-4859. We present the model results and discuss their implications.

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Key words

gamma rays: theory,pulsars: individual (XSS J12270-4859, PSR J1723-2837),radiation mechanism: non-thermal,x-rays: binaries

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【要点】：本文改进了现有毫秒脉冲双星系统中的内星震模型，考虑了辐射损失，并成功解释了长期X射线变化现象，预测了特定脉冲星可以被Cherenkov望远镜阵列探测到。

【方法】：作者在Sim等人的内星震模型基础上，引入了X射线发射电子和正电子的辐射损失，并通过计算验证了这些损失对观测到的光变曲线和能谱的影响不显著。

【实验】：利用 refined IBS 模型，对PSR J1723-2837进行了预测，并使用XSS J12270-4859和PSR J1723-2837的观测数据验证了模型对长期X射线变化现象的解释，结果支持了模型的有效性。

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