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arXiv 0811.4057astro-ph
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致密高质量X射线双星内部吸积中子星附近的γ射线

Gamma-rays from the vicinity of accreting neutron stars inside compact high-mass X-ray binaries

W. Bednarek

备注：
13 pages, 9 figures, revised version submitted to A&A
发表信息：
2009 A&A, 495, 919
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摘要：

大质量恒星的稠密风可以被致密双星系统中的中子星（NS）部分捕获。根据NS和风的参数，物质可以穿透内部NS磁层。在离NS一定距离处，由于磁压和吸积物质插入的压力之间的平衡，形成了一个非常湍流和磁化的过渡区。这个区域为粒子加速到相对论能量提供了良好的条件。过渡区的物质可以进一步吸积到NS表面（吸积相）或从NS附近排出（螺旋桨相）。我们认为，在过渡区集中的情况下，至少有一部分的物质落在NS表面上的电子加速的后果。该物质在NS表面上产生热点，其发射热辐射。相对论性电子在同步加速过程和这种热辐射的逆康普顿（IC）散射中损失能量。我们计算同步辐射光谱（从X射线到软$γ$ -射线）和IC光谱（几十兆电子伏以上）预期在这样的情况下。有人认为，人口最近发现的大质量双星的INTEGRAL天文台，其中包含中子星隐藏在密集的恒星风的大质量恒星，可以检测到最近推出的{ \it费米} LAT望远镜在GeV的能量范围。作为一个例子，我们预测预期的$γ$射线通量从最近发现的源IGR J19140+0951。

英文摘要：

Dense wind of a massive star can be partially captured by a neutron star (NS) inside a compact binary system. Depending on the parameters of NS and the wind, the matter can penetrate the inner NS magnetosphere. At some distance from the NS a very turbulent and magnetized transition region is formed due to the balance between the magnetic pressure and the pressure inserted by accreting matter. This region provides good conditions for acceleration of particles to relativistic energies. The matter at the transition region can farther accrete onto the NS surface (the accretor phase) or is expelled from the NS vicinity (the propeller phase). We consider the consequences of acceleration of electrons at the transition region concentrating on the situation in which at least part of the matter falls onto the NS surface. This matter creates a hot spot on the NS surface which emits thermal radiation. Relativistic electrons lose energy on the synchrotron process and the inverse Compton (IC) scattering of this thermal radiation. We calculate the synchrotron spectra (from X-rays to soft $γ$-rays) and IC spectra (above a few tens MeV) expected in such a scenario. It is argued that a population of recently discovered massive binaries by the INTEGRAL observatory, which contain neutron stars hidden inside dense stellar winds of massive stars, can be detectable by the recently launched {\it Fermi} LAT telescope at GeV energy range. As an example, we predict the expected $γ$-ray flux from recently discovered source IGR J19140+0951.

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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