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)
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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 |
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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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