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PULXs as Accreting Magnetars: Observational Manifestations

Brice, N; Zane, S; Taverna, R; Turolla, R; Wu, K; (2023) PULXs as Accreting Magnetars: Observational Manifestations. In: Proceedings of the International Astronomical Union. (pp. pp. 263-266). Cambridge University Press (CUP) 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, and could be the first and only evidence for the existence of magnetars in binary systems. Their apparent 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 spectra and the characteristics of the X-ray lightcurve of these system, detailed quantitative calculations are still missing. In particular, the observed soft X-ray lightcurves are almost sinuosidal and show an increase in the pulsed fraction (from 8% up to even 30%) with increasing energy. Here, we present how emission originating from an optically thick envelope, expected to be formed during super-Eddington accretion, can result in pulsed fractions similar to observations.

Type: Proceedings paper
Title: PULXs as Accreting Magnetars: Observational Manifestations
Event: International Astronomical Union Conference
Open access status: An open access version is available from UCL Discovery
DOI: 10.1017/S1743921322001740
Publisher version: https://doi.org/10.1017/S1743921322001740
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: stars: neutron – X-rays: binaries – accretion, accretion discs
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/10171281
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