Neutron star QPOs from oscillating, precessing hot, thick flow

Neutron star QPOs from oscillating, precessing hot, thick flow
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来自振荡、进动的热稠流的中子星 QPO

DOI:
10.1093/mnras/stz3269
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发表时间:
2019
影响因子:
4.8
通讯作者:
Fragile, P. Chris
Fragile, P. Chris
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Fragile, P. Chris

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在黑洞(BH)和中子星(NS)低质量x射线双星(lmxb)中,某些高频和低频准周期振荡(QPOs)之间似乎存在一定的相关性。在之前的一篇论文中,我们表明,对于BH lmxb,这可以用一个热的、厚的、环状日冕的同步振荡和进动来解释。在目前的工作中,我们通过将水平分支振荡(HBOs)与进动和上千赫兹(ukHz) QPO与垂直行星运动联系起来,将这一想法扩展到NS lmxb。对于Atoll源4U 1608-52,该模型可以通过改变环面内外半径来匹配许多不同的,同时观测到的HBO和ukhz QPO,同时保持固定的质量(MNS)和自旋(a*)。最佳拟合值为mns = 1.38±0.03 M⊙和*= 0.325±0.005。将这些约束条件与测量的自旋频率相结合,我们可以得到其转动惯量的估计值为1.40±0.02 × 1045g cm2,这对状态方程进行了约束。该模型无法拟合较低khz的QPO,但有证据表明,QPO可能与吸积流和NS表面之间的边界层有关,这在本工作中没有得到处理。
Across black hole (BH) and neutron star (NS) low-mass X-ray binaries (LMXBs), there appears to be some correlation between certain high- and low-frequency quasi-periodic oscillations (QPOs). In a previous paper, we showed that for BH LMXBs, this could be explained by the simultaneous oscillation and precession of a hot, thick, torus-like corona. In the current work, we extend this idea to NS LMXBs by associating the horizontal branch oscillations (HBOs) with precession and the upper-kiloHertz (ukHz) QPO with vertical epicyclic motion. For the Atoll source 4U 1608-52, the model can match many distinct, simultaneous observations of the HBO andukHz QPO by varying the inner and outer radius of the torus, while maintaining fixed values for the mass (MNS) and spin (a*) of the NS. The best-fitting values areMNS= 1.38 ± 0.03 M⊙anda*= 0.325 ± 0.005. By combining these constraints with the measured spin frequency, we are able to obtain an estimate for the moment of inertia ofINS= 1.40 ± 0.02 × 1045g cm2, which places constraints on the equation of state. The model is unable to fit the lower-kHz QPO, but evidence suggests that QPO may be associated with the boundary layer between the accretion flow and the NS surface, which is not treated in this work.
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