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arXiv 1603.04070astro-ph.HE
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GRO J1655-40中的超爱丁顿康普顿厚风?

A Super-Eddington Compton-Thick Wind in GRO J1655-40?

J. Neilsen, F. Rahoui, J. Homan, M. Buxton

摘要:

在2005年的爆发中,GRO J1655-40被钱德拉HETGS以高光谱分辨率观测到,揭示了一个富含蓝移吸收线的光谱,表明了一个吸积盘风-显然太热,太密集,太靠近黑洞,而不是由辐射压力或热压力驱动(米勒等人)。但是这种奇异的风只是这次爆发中的一块拼图,因为它的存在与极其柔软和弯曲的X射线连续光谱,显着的X射线可变性(Uttley & Klein-Wolt)以及明亮的,意想不到的光学/红外黑体分量相一致,该黑体分量随轨道周期而变化。聚焦于X射线连续谱和光学/红外/紫外光谱能量分布,我们认为这种“超软状态”的不寻常特征是来自盘的超爱丁顿康普顿厚风的自然后果:光学/红外黑体代表密集的冷光球,扩展流出,而X射线发射被解释为康普顿散射相对凉爽,光学厚风。这种风掩盖了内盘的内在光度,我们认为它可能已经达到或超过了爱丁顿极限。

英文摘要:

During its 2005 outburst, GRO J1655-40 was observed at high spectral resolution with the Chandra HETGS, revealing a spectrum rich with blueshifted absorption lines indicative of an accretion disk wind -- apparently too hot, too dense, and too close to the black hole to be driven by radiation pressure or thermal pressure (Miller et al.). But this exotic wind represents just one piece of the puzzle in this outburst, as its presence coincides with an extremely soft and curved X-ray continuum spectrum, remarkable X-ray variability (Uttley & Klein-Wolt), and a bright, unexpected optical/infrared blackbody component that varies on the orbital period. Focusing on the X-ray continuum and the optical/infrared/UV spectral energy distribution, we argue that the unusual features of this "hypersoft state" are natural consequences of a super-Eddington Compton-thick wind from the disk: the optical/infrared blackbody represents the cool photosphere of a dense, extended outflow, while the X-ray emission is explained as Compton scattering by the relatively cool, optically thick wind. This wind obscures the intrinsic luminosity of the inner disk, which we suggest may have been at or above the Eddington limit.

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