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arXiv 1601.04750astro-ph.HE
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超铝超软源的厚吸积盘吸积盘模型

Thick Accretion Disk Model for Ultraluminous Supersoft Sources

Wei-Min Gu, Mou-Yuan Sun, You-Jun Lu, Feng Yuan, Ji-Feng Liu

摘要:

我们提出了一个几何厚,超爱丁顿吸积盘模型,其中光学厚风是不必要的,了解超铝超软源(ULS)。对于高质量吸积率$\dot M \ga 30\dot M_{\rm Edd}$和不小的倾角$θ\ga 25^{\circ}$,其中$\dot M_{\rm Edd}$是爱丁顿吸积率,从热的内部区域的硬光子可能被遮蔽的几何厚的内盘,因此只有软光子从外部薄盘和外光球的厚盘可以到达观察者。我们的模型可以很自然地解释典型热半径和热温度$R_{\rm bb} \propto T_{\rm bb}^{-2}$之间的近似关系。此外,厚盘模型可以统一ULS和正常的超亮X射线源,其不同的观测特征可能与倾角和质量吸积率有关。通过与光学厚外流模型的比较,我们发现在我们的模型中需要更小的质量吸积速率。

英文摘要:

We propose a geometrically thick, super-Eddington accretion disk model, where an optically thick wind is not necessary, to understand ultraluminous supersoft sources (ULSs). For high mass accretion rates $\dot M \ga 30\dot M_{\rm Edd}$ and not small inclination angles $θ\ga 25^{\circ}$, where $\dot M_{\rm Edd}$ is the Eddington accretion rate, the hard photons from the hot inner region may be shaded by the geometrically thick inner disk, and therefore only the soft photons from the outer thin disk and the outer photosphere of the thick disk can reach the observer. Our model can naturally explain the approximate relation between the typical thermal radius and the thermal temperature, $R_{\rm bb} \propto T_{\rm bb}^{-2}$. Moreover, the thick disk model can unify ULSs and normal ultraluminous X-ray sources, where the different observational characteristics are probably related to the inclination angle and the mass accretion rate. By comparing our model with the optically thick outflow model, we find that less mass accretion rate is required in our model.

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