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首页> 外文期刊>The Astrophysical Journal. Letters >Submillimeter quasi-periodic oscillations in magnetically choked accretion flow models of sgrA*
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Submillimeter quasi-periodic oscillations in magnetically choked accretion flow models of sgrA*

机译:sgrA *的磁扼吸积流模型中的亚毫米准周期振荡

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High-frequency quasi-periodic oscillations (QPOs) appear in general-relativistic magnetohydrodynamic simulations of magnetically choked accretion flows around rapidly rotating black holes (BHs). We perform polarized radiative transfer calculations with the ASTRORAY code to explore the manifestations of these QPOs for SgrA*. We construct a simulation-based model of a radiatively inefficient accretion flow and find model parameters by fitting the mean polarized source spectrum. The simulated QPOs have a total submillimeter flux amplitude up to 5% and a linearly polarized flux amplitude up to 2%. The oscillations reach high levels of significance 10σ-30σ and high-quality factors Q ≈ 5. The oscillation period T ≈ 100 M ≈ 35 minutes corresponds to the rotation period of the BH magnetosphere that produces a trailing spiral in resolved disk images. The total flux signal is significant over noise for all tested frequencies 87 GHz, 230 GHz, and 857 GHz and inclination angles 10°, 37°, and 80°. The non-detection in the 230 GHz SubMillimeter Array light curve is consistent with a low signal level and a low sampling rate. The presence of submillimeter QPOs in SgrA* will be better tested with the Atacama Large Millimeter Array.
机译:高频准周期振荡(QPO)出现在围绕快速旋转的黑洞(BH)的磁阻吸积流的广义相对论磁流体动力学模拟中。我们使用ASTRORAY代码执行极化辐射传输计算,以探索这些SPOA * QPO的表现。我们构建了辐射效率低下的积聚流的基于仿真的模型,并通过拟合平均极化源光谱找到模型参数。模拟的QPO具有高达5%的总亚毫米通量振幅和高达2%的线性极化通量振幅。振荡达到高水平的有效10σ-30σ和高质量因子Q≈5。振荡周期T≈100 M≈35分钟对应于BH磁层的旋转周期,该周期在已分解的磁盘图像中产生拖尾的螺旋。对于所有测试频率87 GHz,230 GHz和857 GHz以及倾角10°,37°和80°而言,总通量信号在噪声方面都非常重要。 230 GHz亚毫米波阵列光曲线中的未检测到与低信号电平和低采样率一致。使用Atacama大毫米波阵列可以更好地测试SgrA *中亚毫米级QPO的存在。

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