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The impact of precession on the observed population of ULXs

Khan, N.; Middleton, M.J.; Wiktorowicz, G.; Dauser, T.; Roberts, T.P.; Wilms, J.

The impact of precession on the observed population of ULXs Thumbnail


Authors

N. Khan

M.J. Middleton

G. Wiktorowicz

T. Dauser

J. Wilms



Abstract

The discovery of neutron stars (NSs) powering several ultraluminous X-ray sources (ULXs) raises important questions about the nature of the underlying population. In this paper, we build on previous work studying simulated populations by incorporating a model where the emission originates from a precessing, geometrically beamed wind-cone, created by a supercritical inflow. We obtain estimates – independent of the prescription for the precession period of the wind – for the relative number of ULXs that are potentially visible (persistent or transient) for a range of underlying factors such as the relative abundance of black holes or NSs within the population, maximum precessional angle, and low-mass X-ray binary duty cycle. We make initial comparisons to existing data using a catalogue compiled from XMM–Newton. Finally, based on estimates for the precession period, we determine how the eROSITA all-sky survey (eRASS) will be able to constrain the underlying demographic.

Citation

Khan, N., Middleton, M., Wiktorowicz, G., Dauser, T., Roberts, T., & Wilms, J. (2022). The impact of precession on the observed population of ULXs. Monthly Notices of the Royal Astronomical Society, 509(2), 2493-2506. https://doi.org/10.1093/mnras/stab3049

Journal Article Type Article
Acceptance Date Oct 15, 2021
Online Publication Date Oct 23, 2021
Publication Date 2022-01
Deposit Date Nov 1, 2021
Publicly Available Date Mar 18, 2022
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 509
Issue 2
Pages 2493-2506
DOI https://doi.org/10.1093/mnras/stab3049
Related Public URLs http://arxiv.org/pdf/2110.11318

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal astronomical Society ©: 2021, The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.







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