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arXiv 1509.01433astro-ph.HE
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盘环境在双星系统PSR B1259-63/LS 2883的gamma-ray发射中的作用

Role of the disk environment in the gamma-ray emission from the binary system PSR B1259-63/LS 2883

Iurii Sushch, Markus Böttcher

摘要:

PSR B1259-63/LS 2883是一颗非常高能量(VHE; E > 100 GeV)的伽马射线双星,由一颗48 ms的脉冲星组成,围绕一颗Be星运行,周期为3.4年。Be星有一个拱星盘,它相对于轨道倾斜,脉冲星在每个轨道上都会穿过它两次。拱星盘提供了一个额外的目标光子场,这可能有助于逆康普顿散射和伽马-伽马吸收,在观测到的高能量发射光谱和光变曲线中留下特征印记。我们研究康普顿支持的签名,VHE伽马射线诱导的对级联在拱盘的Be星和它们可能的贡献的GeV通量。我们还研究了可能的影响,在磁盘上观察到的TeV光变曲线的γ-γ吸收。我们表明,VHE伽马射线在恒星和磁盘光子场的累积吸收可以解释的调制流量在近星通道。

英文摘要:

PSR B1259-63/LS 2883 is a very high energy (VHE; E > 100 GeV) gamma-ray emitting binary consisting of a 48 ms pulsar orbiting around a Be star with a period of 3.4 years. The Be star features a circumstellar disk which is inclined with respect to the orbit in such a way that the pulsar crosses it twice every orbit. The circumstellar disk provides an additional field of target photons which may contribute to inverse Compton scattering and gamma-gamma absorption, leaving a characteristic imprint in the observed spectrum and light curve of the high energy emission. We study the signatures of Compton-supported, VHE gamma-ray induced pair cascades in the circumstellar disc of the Be star and their possible contribution to the GeV flux. We also study a possible impact of the gamma-gamma absorption in the disk on the observed TeV light curve. We show that the cumulative absorption of VHE gamma-rays in stellar and disk photon fields can explain the modulation of the flux at the periastron passage.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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