MODELING THE MULTIWAVELENGTH LIGHT CURVES OF PSR B1259-63/LS 2883. II. THE EFFECTS OF ANISOTROPIC PULSAR WIND AND DOPPLER BOOSTING
MODELING THE MULTIWAVELENGTH LIGHT CURVES OF PSR B1259-63/LS 2883. II. THE EFFECTS OF ANISOTROPIC PULSAR WIND AND DOPPLER BOOSTING
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DOI：
10.1088/0004-637x/753/2/127
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发表时间：
2012-05
期刊：
影响因子：
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通讯作者：
S. Kong;S. Kong;K. Cheng;Yue Huang
中科院分区：
文献类型：
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作者：
S. Kong;S. Kong;K. Cheng;Yue Huang
PSR B1259-63/LS 2883是一个双星系统，其中一颗48 ms脉冲星在高偏心轨道上绕Be星星运行，轨道周期约为3.4年。它是特殊的，在X射线和TeV光变曲线中具有不对称的双峰轮廓。最近，费米伽马射线天文台在最后一次近星点通过数周后探测到了一个意想不到的GeV耀斑。在本文中，我们表明，这个观察到的GeV耀斑可以产生的多普勒助推同步辐射的弓形激波尾巴。一个各向异性的脉冲星风模型，它主要影响在不同的轨道相位的能量通量注入到终端激波，本文也被使用，我们发现，在脉冲星风的各向异性可以发挥重要作用，在产生不对称的双峰轮廓在X射线和TeV的光变曲线。近星点前的X射线和TeV光子主要由激波顶点附近的激波电子产生，近星点后的光变曲线则由激波顶点和激波尾部的辐射共同贡献，导致光变曲线不对称的双峰。
PSR B1259-63/LS 2883 is a binary system in which a 48 ms pulsar orbits around a Be star in a high eccentric orbit with a long orbital period of about 3.4 yr. It is special for having asymmetric two-peak profiles in both the X-ray and TeV light curves. Recently, an unexpected GeV flare has been detected by the Fermi gamma-ray observatory several weeks after the last periastron passage. In this paper, we show that this observed GeV flare could be produced by the Doppler-boosted synchrotron emission in the bow-shock tail. An anisotropic pulsar wind model, which mainly affects the energy flux injection into the termination shock in a different orbital phase, is also used in this paper, and we find that the anisotropy in the pulsar wind can play a significant role in producing the asymmetric two-peak profiles in both X-ray and TeV light curves. The X-ray and TeV photons before periastron are mainly produced by the shocked electrons around the shock apex, and the light curves after periastron are contributed by the emission from the shock apex and the shock tail together, which result in asymmetric two-peak light curves.