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arXiv 2209.01264astro-ph.GAastro-ph.HE
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基于Chandra数据的NGC 6240超大质量黑洞双星动力学演化

NGC 6240 Supermassive Black Hole Binary dynamical evolution based on Chandra data

M. Sobolenko, O. Kompaniiets, P. Berczik, V. Marchenko, A. Vasylenko, E. Fedorova, B. Shukirgaliyev

摘要:

我们的主要工作是根据Chandra空间天文台的X射线观测资料估算NGC 6240中心的双超大质量黑洞(SMBH)系统的物理合并时间。北方和南方的核的光谱拟合光谱模型从夏尔巴和都提出了铁K $α$发射线的窄组件。它使我们能够将光谱模型应用于这些线,并找到相对偏移量$\approx0.02$ keV。对NGC 6240中心区半径为1kpc的封闭动力学质量进行了$\approx 2.04\times 10^{11} \rm\; M_{\odot}$估计。这些数据使我们能够进行高分辨率的直接N体模拟与牛顿和后牛顿($2.5\mathcal{PN}$校正)动力学为这个特定的双SMBH系统。因此,从我们的数值模型,我们近似的中央SMBH二进制合并时间为不同的二进制偏心率。在我们的数值参数范围内,即使对于非常小的偏心率,合并时间的上限仍然低于$\approx70$百万年。在最后的合并阶段,可以使用脉冲星定时阵列(PTA)项目检测到来自此类事件的引力波形和幅频图像。

英文摘要:

The main idea of our research is to estimate the physical coalescence time of the double supermassive black hole (SMBH) system in the centre of NGC 6240 based on the X-ray observations from the Chandra space observatory. The spectra of the Northern and Southern nuclei were fitted by spectral models from Sherpa and both presented the narrow component of the Fe K$α$ emission line. It enabled us to apply the spectral model to these lines and to find relative offset $\approx0.02$ keV. The enclosed dynamical mass of the central region of NGC 6240 with radius 1 kpc was estimated $\approx 2.04\times 10^{11} \rm\; M_{\odot}$. These data allowed us to carry on the high resolution direct N-body simulations with Newtonian and post-Newtonian (up to $2.5\mathcal{PN}$ correction) dynamics for this particular double SMBH system. As a result, from our numerical models we approximated the central SMBH binary merging time for the different binary eccentricities. In our numerical parameters range the upper limit for the merging time, even for the very small eccentricities, is still below $\approx70$ Myr. Gravitational waveforms and amplitude-frequency pictures from such events can be detected using Pulsar Timing Array (PTA) projects at the last merging phase.

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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