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arXiv 0901.0392astro-ph.HE
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大质量双星中来自吸积磁星的TeV γ射线

TeV Gamma-rays from accreting magnetars in massive binaries

W. Bednarek

摘要:

我们考虑大质量双星系统中磁星型的中子星。我们确定的条件下,从恒星风的物质可以穿透磁星的内磁层。在离NS表面一定距离处,磁压可以平衡吸积物质的重力压力,从而产生非常湍流的磁化过渡区。这一区域为电子加速到相对论能量提供了良好的条件。这些电子在同步加速器过程和附近大质量恒星伴星辐射的逆康普顿(IC)散射中失去能量,产生高能量的X射线辐射,最高可达$\sim$ TeV $γ$射线。初级$γ$射线被恒星辐射进一步吸收,形成IC $e^\pm$对级联.我们计算了初级电子和次级$e^\pm$对的同步辐射X射线辐射和级联过程的IC $γ$射线辐射。结果表明,TeV $γ$射线双星系统LSI +61 303在X射线和TeV $γ$射线能量范围内的准同时观测可以用这种吸积磁星模型来解释。

英文摘要:

We consider the neutron star (NS) of the magnetar type inside the massive binary system. We determine the conditions under which the matter from the stellar wind can penetrate the inner magnetosphere of the magnetar. At some distance from the NS surface, the magnetic pressure can balance the gravitational pressure of the accreting matter creating very turbulent, magnetized transition region. It is suggested that this region provides good conditions for acceleration of electrons to relativistic energies. These electrons lose energy on the synchrotron process and the Inverse Compton (IC) scattering of the radiation from the nearby massive stellar companion, producing high energy radiation from the X-rays up to $\sim$TeV $γ$-rays. The primary $γ$-rays can be farther absorbed in the stellar radiation developing the IC $e^\pm$ pair cascade. We calculate the synchrotron X-ray emission from primary electrons and secondary $e^\pm$ pairs and the IC $γ$-ray emission from the cascade process. It is shown that the quasi-simultaneous observations of the TeV $γ$-ray binary system LSI +61 303 in the X-ray and the TeV $γ$-ray energy ranges can be explained in such an accreting magnetar model.

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