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Observational Properties of Accreting Neutron Stars with an Optically Thick Envelope

Brice, Nabil; Zane, S; taverna, R; Turolla, R; Wu, K; (2023) Observational Properties of Accreting Neutron Stars with an Optically Thick Envelope. Monthly Notices of the Royal Astronomical Society 10.1093/mnras/stad2391. (In press). Green open access

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Abstract

Pulsating Ultra Luminous X-ray sources (PULXs) are thought to be X-ray bright, accreting, magnetized neutron stars. Their measured soft (<20 keV) X-ray luminosity can exceed the Eddington luminosity for a neutron star (NS) by a few orders of magnitude. Although several scenarios have been proposed to explain the different components observed in the X-ray spectrum and the characteristics of the X-ray pulse profile of these system, detailed quantitative calculations are still missing. In particular, the observed soft X-ray pulse profiles are almost sinusoidal and show an increase in the pulsed fraction (from 8 % up to even 30 %) with increasing energy. In this work, we discuss how emission originating from an optically thick envelope, expected to be formed during super-Eddington accretion, can match the observed spectra and pulse profiles.

Type: Article
Title: Observational Properties of Accreting Neutron Stars with an Optically Thick Envelope
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stad2391
Publisher version: https://doi.org/10.1093/mnras/stad2391
Language: English
Additional information: © The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/).
Keywords: stars: neutron, accretion, accretion discs, X-rays: binaries, magnetic fields, radiative transfer, pulsars: general
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10175351
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