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arXiv 1011.2004astro-ph.HE
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Be星的红外过量对PSR B1259-63/SS 2883中逆康普顿gamma-ray产生的影响

The effect of the infrared excess from the Be star on inverse Compton gamma-ray production in PSR B1259-63/SS 2883

B. van Soelen, P. J. Meintjes

摘要:

双星系统PSR B1259-63由一颗48毫秒的脉冲星组成,它围绕一颗Be星运行3.4年,在以前的近星点通道附近已经探测到了非脉冲TeV伽马射线辐射。一个可能的伽马射线源是在plerion激波阵面区域的超相对论性电子/正电子脉冲星风对Be星的目标光子的逆康普顿上散射。在这项研究中,从Be星的拱星盘上的逆康普顿γ射线产生PSR B1259-63的红外辐射的效果进行了研究,考虑各向同性光子/电子近似。修正的光子密度分布是通过使用生长曲线法拟合以前的光学和红外观测确定的。利用修正的光子分布和精确的散射方程计算了逆康普顿散射率。结果表明,包括红外发射增加了一个因素$\ga 2$的GeV的伽玛射线通量。

英文摘要:

The binary system PSR B1259-63 consists of a 48 ms pulsar in a 3.4 year orbit around a Be star and unpulsed TeV gamma-ray emission has been detected near previous periastron passages. A likely source of the gamma-rays is the inverse Compton up-scattering of target photons from the Be star by the ultra-relativistic electron/positron pulsar wind in the region of the plerion shock front. In this study the effect of the infrared emission from the Be star's circumstellar disc on inverse Compton gamma-ray production in PSR B1259-63 is investigated by considering an isotropic photon/electron approximation. The modified photon density distribution is determined by using a curve of growth method fitted to previous optical and infrared observations. The inverse Compton scattering rate is calculated using the modified photon distribution and the exact scattering equation. It is shown that including the infrared emission increase the GeV gamma-ray flux by a factor $\ga 2$.

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