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Combining timing characteristics with physical broadband spectral modelling of black hole X-ray binary GX~3394
Riley M. T. Connors, David van Eijnatten, Sera Markoff +6
GX~3394 is a black hole X-ray binary that is a key focus of accretion studies since it goes into outburst roughly every two-to-three years. Tracking of its radio, IR and X-ray f…
Exploring the Long-Term Evolution of GRS 1915+105
D. Huppenkothen, L. M. Heil, D. W. Hogg +1
Among the population of known galactic black hole X-ray binaries, GRS 1915+105 stands out in multiple ways. It has been in continuous outburst since 1992, and has shown a wide rang…
A quasi-periodic modulation of the iron line centroid energy in the black hole binary H 1743-322
Adam Ingram, Michiel van der Klis, Matthew Middleton +5
Accreting stellar-mass black holes often show a `Type-C' quasi-periodic oscillation (QPO) in their X-ray flux, and an iron emission line in their X-ray spectrum. The iron line is g…
A variable ULX and possible IMBH candidate in M51a
Hannah M. Earnshaw, Timothy P. Roberts, Lucy M. Heil +7
ULX-7, in the northern spiral arm of M51, demonstrates unusual behaviour for an ultraluminous X-ray source, with a hard X-ray spectrum but very high short-term variability. This su…
ULX behaviour: the ultraluminous state, winds & interesting anomalies
T. P. Roberts, M. J. Middleton, A. D. Sutton +3
Recent evidence - in particular the hard X-ray spectra obtained by NuSTAR, and the large amplitude hard X-ray variability observed when ultraluminous X-ray sources (ULXs) show soft…
Diagnosing the accretion flow in ultraluminous X-ray sources using soft X-ray atomic features
Matthew J. Middleton, Dominic J. Walton, Andrew Fabian +5
The lack of unambiguous detections of atomic features in the X-ray spectra of ultraluminous X-ray sources (ULXs) has proven a hindrance in diagnosing the nature of the accretion fl…