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arXiv 1206.2647astro-ph.HE
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环双星吸积盘对黑洞质量损失的响应

Response of a circumbinary accretion disc to black hole mass loss

Giovanni P. Rosotti, Giuseppe Lodato, Daniel J. Price

摘要:

研究了两个超大质量黑洞合并引起质量损失后环双星吸积盘的面密度演化。首先,我们引入一个分析模型,假设由测试粒子组成的光盘,推导出光盘的表面密度的演变质量损失。该模型预测形成尖锐的密度峰值在光盘中,该模型还允许我们计算这些峰值形成的典型时间尺度。为了测试和验证模型,我们运行的过程中使用光滑粒子流体动力学(SPH)代码PHANTOM,考虑到流体的影响进行数值模拟。我们发现模型和模拟之间的峰的形状和位置很好的协议。然而,在流体盘中,由质量损失引起的周转振荡可以消散,并且只有一些预测的峰值在模拟中形成。为了量化这种耗散进行得有多快,我们引入了一个适当的参数,我们表明,它是有效的,在解释分析,碰撞模型和一个真正的流体盘之间的差异。

英文摘要:

We investigate the evolution of the surface density of a circumbinary accretion disc after the mass loss induced by the merger of two supermassive black holes. We first introduce an analytical model, under the assumption of a disc composed of test particles, to derive the surface density evolution of the disc following the mass loss. The model predicts the formation of sharp density peaks in the disc; the model also allows us to compute the typical timescale for the formation of these peaks. To test and validate the model, we run numerical simulations of the process using the Smoothed Particle Hydrodynamics (SPH) code PHANTOM, taking fluid effects into account. We find good agreement in the shape and position of the peaks between the model and the simulations. In a fluid disc, however, the epicyclic oscillations induced by the mass loss can dissipate, and only some of the predicted peaks form in the simulation. To quantify how fast this dissipation proceeds, we introduce an appropriate parameter, and we show that it is effective in explaining the differences between the analytical, collisionless model and a real fluid disc.

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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