The impact of precession on the observed population of ULXs
The impact of precession on the observed population of ULXs
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.
Khan, Norman
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Middleton, Matthew
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Wiktorowicz, Grzegorz
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Dauser, Thomas
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Roberts, Timothy P.
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Wilms, Joern
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23 October 2021
Khan, Norman
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Middleton, Matthew
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Wiktorowicz, Grzegorz
f2277210-4d99-4441-aa25-c5d324dfda2b
Dauser, Thomas
eb326b59-38f6-475e-9f26-e1c2b40cef82
Roberts, Timothy P.
978a10ee-243e-4eaa-8a91-91aa06d35dc6
Wilms, Joern
c3d688ee-b7d5-4497-a531-1f88b9f56c0d
Khan, Norman, Middleton, Matthew, Wiktorowicz, Grzegorz, Dauser, Thomas, Roberts, Timothy P. and Wilms, Joern
(2021)
The impact of precession on the observed population of ULXs.
Monthly Notices of the Royal Astronomical Society.
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.
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2110.11318
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stab3049
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Accepted/In Press date: 15 October 2021
Published date: 23 October 2021
Additional Information:
arXiv:2110.11318
Identifiers
Local EPrints ID: 454230
URI: http://eprints.soton.ac.uk/id/eprint/454230
ISSN: 1365-2966
PURE UUID: 58edabca-9664-4d3c-afdf-16f3e0848b23
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Date deposited: 03 Feb 2022 17:42
Last modified: 16 Mar 2024 15:30
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Author:
Norman Khan
Author:
Grzegorz Wiktorowicz
Author:
Thomas Dauser
Author:
Timothy P. Roberts
Author:
Joern Wilms
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