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Ultra-luminous X-ray sources as neutron stars propelling and accreting at super-critical rates in high-mass X-ray binaries

Published online by Cambridge University Press:  30 December 2019

M. Hakan Erkut Open the ORCID record for M. Hakan Erkut [Opens in a new window]  and
K. Yavuz Ekşi
M. Hakan Erkut
Affiliation:
Physics Engineering Department, Faculty of Science and Letters, Istanbul Technical University, 34469, Istanbul, Turkey emails: [email protected], [email protected]
K. Yavuz Ekşi
Affiliation:
Physics Engineering Department, Faculty of Science and Letters, Istanbul Technical University, 34469, Istanbul, Turkey emails: [email protected], [email protected]
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Ultra-luminous X-ray sources (ULXs) are off-nuclear point sources in nearby galaxies with luminosities well exceeding the Eddington limit for stellar-mass objects. It has been recognized after the discovery of pulsating ULXs (PULXs) that a fraction of these sources could be accreting neutron stars in high-mass X-ray binaries (HMXBs) though the majority of ULXs are lacking in coherent pulsations. The earliest stage of some HMXBs may harbor rapidly rotating neutron stars propelling out the matter transferred by the massive companion. The spin-down power transferred by the neutron-star magnetosphere to the accretion disk at this stage can well exceed the Eddington luminosities and the system appears as a non-pulsating ULX. In this picture, PULXs appear as super-critical mass-accreting descendants of non-pulsating ULXs. We present this evolutionary scenario within a self-consistent model of magnetosphere-disk interaction and discuss the implications of our results on the spin and magnetic field of the neutron star.

Keywords

X-rays: binariesstars: neutronstars: mass lossaccretionaccretion disks
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S346: High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objects , August 2018 , pp. 259 - 263
Copyright
© International Astronomical Union 2019 

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