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首页> 外文期刊>Astronomy and astrophysics >Disc-oscillation resonance and neutron star QPOs: 3:2 epicyclic orbital model
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Disc-oscillation resonance and neutron star QPOs: 3:2 epicyclic orbital model

机译：圆盘振荡共振和中子星QPO：3：2周转轨道模型

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摘要

The high-frequency quasi-periodic oscillations (HF QPOs) that appear in the X-ray fluxes of low-mass X-ray binaries remain an unexplained phenomenon. Among other ideas, it has been suggested that a non-linear resonance between two oscillation modes in an accretion disc orbiting either a black hole or a neutron star plays a role in exciting the observed modulation. Several possible resonances have been discussed. A particular model assumes resonances in which the disc-oscillation modes have the eigenfrequencies equal to the radial and vertical epicyclic frequencies of geodesic orbital motion. This model has been discussed for black hole microquasar sources as well as for a group of neutron star sources. Assuming several neutron (strange) star equations of state and Hartle-Thorne geometry of rotating stars, we briefly compare the frequencies expected from the model to those observed. Our comparison implies that the inferred neutron star radius RNS is larger than the related radius of the marginally stable circular orbit rms for nuclear matter equations of state and spin frequencies up to 800?Hz. For the same range of spin and a strange star (MIT) equation of state, the inferrred radius is RNS?~?rms. The “Paczyński modulation” mechanism considered within the model requires that RNS?
机译：低质量X射线双星的X射线通量中出现的高频准周期振荡（HF QPO）仍然是无法解释的现象。在其他想法中，已经提出，在绕黑洞或中子星运动的吸积盘中，两个振荡模式之间的非线性共振在激发观察到的调制中起作用。已经讨论了几种可能的共振。一个特定的模型假设共振，其中圆盘振动模式的本征频率等于测地轨道运动的径向和垂直周转频率。已经针对黑洞微类星源以及一组中子星源讨论了该模型。假设有几个中子（奇异）恒星状态方程和旋转恒星的Hartle-Thorne几何形状，我们将模型预期的频率与观察到的频率进行简要比较。我们的比较表明，对于状态高达800？Hz的核物质方程，推断的中子星半径RNS大于边际稳定圆形轨道rms的相关半径。对于相同的自旋范围和奇异星（MIT）状态方程，推断的半径为RNS？〜？rms。模型中考虑的“Paczyński调制”机制要求RNS？

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