Abstract The Laser Interferometer Space Antenna (LISA) will be a transformative experiment
for gravitational wave astronomy, and, as such, it will offer unique opportunities to address …

We review recent works on the dynamics of circumbinary accretion, including time variability,
angular momentum transfer between the disk and the binary, and the secular evolution of …

Gas falling into a black hole (BH) from large distances is unaware of BH spin direction, and
misalignment between the accretion disc and BH spin is expected to be common. However …

The radiative cooling timescales at the centers of hot atmospheres surrounding elliptical
galaxies, groups and clusters are much shorter than their ages. Therefore, hot atmospheres …

I review the current status of X-ray reflection (aka broad iron line) based black hole spin
measurements. This is a powerful technique that allows us to measure robust black hole …

The next two decades are expected to open the door to the first coincident detections of
electromagnetic (EM) and gravitational-wave (GW) signatures associated with massive …

Bondi theory is often assumed to adequately describe the mode of accretion in astrophysical
environments. However, the Bondi flow must be adiabatic, spherically symmetric, steady …

We review the expected science performance of the New Gravitational-Wave Observatory
(NGO, aka eLISA), a mission under study by the European Space Agency for launch in the …

We construct evolutionary models of the populations of active galactic nuclei (AGNs) and
supermassive black holes, in which the black hole mass function grows at the rate implied …

The plasma haloes filling massive galaxies, groups and clusters are shaped by active
galactic nucleus (AGN) heating and subsonic turbulence (σ v∼ 150 km s− 1), as probed by …