Timing analysis of 2S 1417-624 observed with NICER and insight-HXMT

Ji, L. and Doroshenko, V. and Santangelo, A. and Güngör, Can and Zhang, S. and Ducci, L. and Zhang3, S. N. and Ge, M. Y. and (Insight-HXMT Collaboration), Insight-HXMT (2019) Timing analysis of 2S 1417-624 observed with NICER and insight-HXMT. Monthly Notices of the Royal Astronomical Society . ISSN 0035-8711 (Print) 1365-2966 (Online) Published Online First http://dx.doi.org/10.1093/mnras/stz2745

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Abstract

We present a study of timing properties of the accreting pulsar 2S 1417-624 observed during its 2018 outburst, based on Swift/BAT, Fermi/GBM, Insight-HXMT and NICER observations. We report a dramatic change of the pulse profiles with luminosity. The morphology of the profile in the range 0.2-10.0 keV switches from double to triple peaks at ∼ 2.5×10^(37) D^{2}_{10} erg s−1 and from triple to quadruple peaks at ∼ 7×10^{37} D^2{2}_{10} erg s−1. The profile at high energies (25-100 keV) shows significant evolutions as well. We explain this phenomenon according to existing theoretical models. We argue that the first change is related to the transition from the sub to the super-critical accretion regime, while the second to the transition of the accretion disc from the gas-dominated to the radiation pressuredominated state. Considering the spin-up as well due to the accretion torque, this interpretation allows to estimate the magnetic field self-consistently at ∼ 7 × 1012 G.
Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Engineering and Natural Sciences > Basic Sciences > Physics
Faculty of Engineering and Natural Sciences
Depositing User: Can Güngör
Date Deposited: 01 Nov 2019 15:11
Last Modified: 26 Apr 2022 10:12
URI: https://research.sabanciuniv.edu/id/eprint/39363

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