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arXiv 2107.01149astro-ph.HE
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GRRMHD模拟中中子星ULX的束发射

Beamed emission from a neutron-star ULX in a GRRMHD simulation

David Abarca, Kyle Parfrey, Włodek Kluźniak

摘要:

以中子星为动力的超铝X射线源(ULX)为模型,在$2\times 10^{10}$ G偶极磁场作用下,对中子星的超临界吸积过程进行了2.5维广义相对论辐射磁流体动力学模拟.我们计算了$\sim 2.5\,L_\mathrm{Edd}$的总光度的下限,并发现辐射是由吸积盘流出高度光束。视各向同性的光度,这是一个功能的视角,达到最大值以上$100\,L_\mathrm{Edd}$,与在ULX中观察到的光度一致。

英文摘要:

We perform a global 2.5D general-relativistic radiation magnetohydrodynamic simulation of super-critical accretion onto a neutron star with a $2\times 10^{10}$ G dipolar magnetic field, as a model of a neutron-star-powered ultraluminous X-ray source (ULX). We compute a lower limit on the total luminosity of $\sim 2.5\,L_\mathrm{Edd}$, and find the radiation to be highly beamed by the accretion disk outflows. The apparent isotropic luminosity, which is a function of the viewing angle, reaches a maximum above $100\,L_\mathrm{Edd}$, consistent with the luminosities observed in ULXs.

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