Long-term evolutionary links between the isolated neutron star populations

Gençali, Ali Arda and Ertan, Ünal (2024) Long-term evolutionary links between the isolated neutron star populations. Monthly Notices of the Royal Astronomical Society, 534 (2). pp. 1481-1489. ISSN 0035-8711 (Print) 1365-2966 (Online)

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Abstract

We have investigated the evolutionary connections of the isolated neutron star (NS) populations including radio pulsars (RPs), anomalous X-ray pulsars (AXPs), soft gamma repeaters (SGRs), dim isolated NSs (XDINs), 'high-magnetic field' RPs ('HBRPs'), central compact objects (CCOs), rotating radio transients (RRATs), and long-period pulsars (LPPs) in the fallback disc model. The model can reproduce these NS families as a natural outcome of different initial conditions (initial period, disc mass, and dipole moment, μ) with a continuous μ distribution in the G cm range. Results of our simulations can be summarized as follows: (1) A fraction of 'HBRPs' with relatively high μ evolve into the persistent AXP/SGR properties, and subsequently become LPPs. (2) Persistent AXP/SGRs do not have evolutionary links with CCOs, XDINs, and RRATs. (3) For a wide range of μ, most RRATs evolve passing through RP or 'HBRP' properties during their early evolutionary phases. (4) A fraction of RRATs which have the highest estimated birth rate seem to be the progenitors of XDINs. (5) LPPs, whose existence was predicted by the fallback disc model, are the sources evolving in the late stage of evolution before the discs become inactive. These results provide concrete support to the ideas proposing evolutionary connections between the NS families to account for the 'birth rate problem', the discrepancy between the cumulative birth rate estimated for these systems and the core-collapse supernova rate.
Item Type: Article
Uncontrolled Keywords: accretion, accretion discs; methods: numerical; pulsars: general; stars: neutron
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Ali Arda Gençali
Date Deposited: 20 Dec 2024 15:19
Last Modified: 20 Dec 2024 15:19
URI: https://research.sabanciuniv.edu/id/eprint/50537

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