Active galactic nuclei (AGN) are energetic astrophysical sources powered by accretion onto
supermassive black holes in galaxies, and present unique observational signatures that …

Luminous accreting stellar mass and supermassive black holes produce power–law
continuum X-ray emission from a compact central corona. Reverberation time lags occur …

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 …

Abstract Narrow-line Seyfert 1 (NLS1) galaxies have low-mass black holes and mass
accretion rates close to (or exceeding) Eddington, so a standard blackbody accretion disc …

We review how the recent increase in X-ray and radio data from black hole and neutron star
binaries can be merged together with theoretical advances to give a coherent picture of the …

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 …

X-ray reverberation, where light-travel time delays map out the compact geometry around
the inner accretion flow in supermassive black holes, has been discovered in several of the …

We show that the rms–flux relation recently discovered in the X-ray light curves of active
galactic nuclei (AGN) and X-ray binaries (XRBs) implies that the light curves have a formally …

The fluctuating-accretion model of Lyubarskii and its extension by Kotov, Churazov &
Gilfanov seek to explain the spectral-timing properties of the X-ray variability of accreting …

Observations have revealed strong evidence for powerful jets in the Low/Hard states of
black hole candidate X-ray binaries. Correlations, both temporal and spectral, between the …