On the lack of X-ray pulsation in most neutron star low-mass X-ray binaries

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Niang, Ndiogou and Ertan, Ünal and Gençali, Ali Arda and Toyran, Ozan and Ulubay, Ayşe and Devlen, Ebru and Alpar, M. Ali and Gügercinoğlu, Erbil (2024) On the lack of X-ray pulsation in most neutron star low-mass X-ray binaries. Monthly Notices of the Royal Astronomical Society, 532 (2). pp. 2133-2142. ISSN 0035-8711 (Print) 1365-2966 (Online)

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Abstract

We have investigated whether the lack of X-ray pulsations from most neutron star (NS) low-mass X-ray binaries (LMXBs) could be due to the extension of their inner disc to the NS surface. To estimate the inner disc radii, we have employed the model, recently proposed to account for the torque reversals of LMXBs. In this model, the inner disc radius depends on the spin period as well as the dipole moment and the mass inflow rate of the disc. Our model results indicate that most LMXBs have mass accretion rates above the minimum critical rates required for the inner disc to reach down to the NS surface and thereby quench the pulsed X-ray emission. For most sources X-ray pulsations are allowed when the period decreases below a certain critical value. For the same parameters, the model is also consistent with the observed X-ray luminosity ranges of the individual accreting millisecond X-ray pulsars (AMXPs). The paucity of AMXPs compared to the majority population of non-pulsing LMXBs is explained, as well as the fact that AMXPs are transient sources.
Item Type: Article
Subjects: Q Science > QB Astronomy > QB460-466 Astrophysics
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Ali Arda Gençali
Date Deposited: 29 Aug 2024 11:34
Last Modified: 29 Aug 2024 11:34
URI: https://research.sabanciuniv.edu/id/eprint/49636

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