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On the Spin of the Black Hole in IC 10 X-1
James F. Steiner, Dominic J. Walton, Javier A. Garcia +5
The compact X-ray source in the eclipsing X-ray binary IC 10 X-1 has reigned for years as ostensibly the most massive stellar-mass black hole, with a mass estimated to be about twi…
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…
X-ray spectral residuals in NGC 5408 X-1: diffuse emission from star formation, or the signature of a super-Eddington wind?
Andrew D. Sutton, Timothy P. Roberts, Matthew J. Middleton
If ultraluminous X-ray sources (ULXs) are powered by accretion onto stellar remnant black holes, then many must be accreting at super-Eddington rates. It is predicted that such hig…
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…
Black hole spin: theory and observation
Matthew Middleton
In the standard paradigm, astrophysical black holes can be described solely by their mass and angular momentum - commonly referred to as `spin' - resulting from the process of thei…
NuSTAR, XMM-Newton and Suzaku Observations of the Ultraluminous X-ray Source Holmberg II X-1
D. J. Walton, M. J. Middleton, V. Rana +14
We present the first broadband 0.3-25.0 kev X-ray observations of the bright ultraluminous X-ray source (ULX) Holmberg II X-1, performed by NuSTAR, XMM-Newton and Suzaku in Septemb…