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arXiv 1611.04401astro-ph.HEastro-ph.SR
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黑洞双星SWIFT J1753 .5-0127中的膨胀热流:来自光学计时的证据

Expanding hot flow in the black hole binary SWIFT J1753.5-0127: evidence from optical timing

A. Veledina, P. Gandhi, R. Hynes, J. J. E. Kajava, S. S. Tsygankov, M. G. Revnivtsev, M. Durant, J. Poutanen

摘要:

描述了黑洞X射线双星SWIFT J1753.5-0127在爆发衰退过程中光学和X射线时间特性的演化。光学/X射线交叉关联函数在突出峰处表现为单一正相关,在衰减阶段出现多个谷和峰,在突出尾部则被预知谷加峰结构所取代。功率谱密度和相位滞后显示了复杂的演变,揭示了内在连接的光学和X射线准周期振荡的存在。我们第一次定量地解释了在整个爆发过程中这些时间特性的演化,其本质是热吸积流向爆发尾部的膨胀。在热流中同步康普顿化产生的光谱的旋转是负责的外观与X射线的反相关和光学准周期振荡。我们的模型很好地再现了下降阶段的互相关和相位滞后谱,这是以前提出的任何模型都无法理解的。

英文摘要:

We describe the evolution of optical and X-ray temporal characteristics during the outburst decline of the black hole X-ray binary SWIFT J1753.5-0127. The optical/X-ray cross-correlation function demonstrates a single positive correlation at the outburst peak, then it has multiple dips and peaks during the decline stage, which are then replaced by the precognition dip plus peak structure in the outburst tail. Power spectral densities and phase lags show a complex evolution, revealing the presence of intrinsically connected optical and X-ray quasi-periodic oscillations. For the first time, we quantitatively explain the evolution of these timing properties during the entire outburst within one model, the essence of which is the expansion of the hot accretion flow towards the tail of the outburst. The pivoting of the spectrum produced by synchrotron Comptonization in the hot flow is responsible for the appearance of the anti-correlation with the X-rays and for the optical quasi-periodic oscillations. Our model reproduces well the cross-correlation and phase lag spectrum during the decline stage, which could not be understood with any model proposed before.

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