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 …

The nearby radio galaxy M87 is a prime target for studying black hole accretion and jet
formation,. Event Horizon Telescope observations of M87 in 2017, at a wavelength of 1.3 …

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 …

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

Strong gravitational lensing of quasars has the potential to unlock the poorly understood
physics of these fascinating objects, as well as serve as a probe of the lensing mass …

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 …

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 …