Astrophysical black hole candidates are thought to be the Kerr black holes of general
relativity, but there is not yet direct observational evidence that the spacetime geometry …

Relativistic reflection features are commonly observed in the X-ray spectra of accreting black
holes. In the presence of high quality data and with the correct astrophysical model, X-ray …

A black hole x-ray binary (XRB) system forms when gas is stripped from a normal star and
accretes onto a black hole, which heats the gas sufficiently to emit x-rays. We report a …

The geometry of the accretion flow around stellar-mass black holes can change on
timescales of days to months,–. When a black hole emerges from quiescence (that is, it 'turns …

We extend our recent work on black hole spin in X-ray binary systems to include an analysis
of 189 archival NuSTAR observations from 24 sources. Using self-consistent data reduction …

The launch of NuSTAR and the increasing number of binary black hole (BBH) mergers
detected through gravitational wave observations have exponentially advanced our …

Current models of the spectrum of X-rays reflected from accretion discs around black holes
and other compact objects are commonly calculated assuming that the density of the disc …

Aims. The only relativistic reflection model that implements a parameter relating the intensity
incident on an accretion disk to the observed intensity is relxill. The parameter used in …

ABSTRACT MAXI J1820+ 070 (optical counterpart ASASSN-18ey) is a black hole candidate
discovered through its recent very bright outburst. The low extinction column and long …

The evolution of massive stars is influenced by the mass lost to stellar winds over their
lifetimes. These winds limit the masses of the stellar remnants (such as black holes) that the …