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Predicting ultraluminous X-ray source demographics from geometrical beaming

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journal contribution
posted on 24.09.2019, 13:16 by Matthew J. Middleton, Andrew King
The ultraluminous X-ray source (ULX) population is known to contain neutron stars (NS), but the relative number of these compared to black hole (BH) primaries is unknown. Assuming classical supercritical accretion and resultant geometrical beaming, we show that the observed population ratio can be predicted from the mean masses of each family of compact objects and the relative spatial density of NSs to BHs. Conversely – and perhaps more importantly – given even a crude estimate for the spatial densities, an estimate of the fraction of the population containing NSs will begin to constrain the mean mass of BHs in ultraluminous X-ray sources.

Funding

MJM appreciates support from an Ernest Rutherford STFC fellowship. Astrophysics research at the University of Leicester is supported by an STFC Consolidated Grant.

History

Citation

Monthly Notices of the Royal Astronomical Society, 2017, 470 (1), pp. L69-L71 (3)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Oxford University Press (OUP), Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Acceptance date

17/05/2017

Copyright date

2017

Available date

24/09/2019

Publisher version

https://academic.oup.com/mnrasl/article/470/1/L69/3836411

Notes

Erratum: Predicting ULX demographics from geometrical beaming Matthew J. Middleton, Andrew King Monthly Notices of the Royal Astronomical Society: Letters, Volume 471, Issue 1, October 2017, Page L71, https://doi.org/10.1093/mnrasl/slx110 http://hdl.handle.net/2381/45713

Language

en