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
中科院分区:
文献类型:
--
作者:
Fragile, P. Chris
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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DOI:
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发表时间:
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期刊:
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影响因子:
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