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The observed vs total population of ULXs
Grzegorz Wiktorowicz, Jean-Pierre Lasota, Matthew Middleton +1
We have analyzed how anisotropic emission of radiation affects the observed sample of ultraluminous X-ray sources (ULXs) by performing simulations of the evolution of stellar popul…
Timing properties of ULX pulsars: optically thick envelopes and outflows
Alexander A. Mushtukov, Adam Ingram, Matthew Middleton +2
It has recently been discovered that a fraction of ultra-luminous X-ray sources (ULXs) exhibit X-ray pulsations, and are therefore powered by super-Eddington accretion onto magneti…
NuSTAR reveals the hidden nature of SS433
M. J. Middleton, D. J. Walton, W. Alston +25
SS433 is the only Galactic binary system known to persistently accrete at highly super-critical (or hyper-critical) rates, similar to those in tidal disruption events, and likely n…
A tale of two periods: determination of the orbital ephemeris of the super-Eddington pulsar NGC 7793 P13
F. Fuerst, D. J. Walton, M. Heida +10
We present a timing analysis of multiple XMM-Newton and NuSTAR observations of the ultra-luminous pulsar NGC 7793 P13 spread over its 65d variability period. We use the measured pu…
A Potential Cyclotron Resonant Scattering Feature in the ULX Pulsar NGC 300 ULX1 seen by NuSTAR and XMM-Newton
D. J. Walton, M. Bachetti, F. Fuerst +14
Based on phase-resolved broadband spectroscopy using - and , we report on a potential cyclotron resonant scattering feature at keV in the pulsed sp…
Evidence for Pulsar-like Emission Components in the Broadband ULX Sample
D. J. Walton, F. Fuerst, M. Heida +7
We present broadband X-ray analyses of a sample of bright ultraluminous X-ray sources with the goal of investigating the spectral similarity of this population to the known ULX pul…