We summarize what large surveys of the contemporary Universe have taught us about the
physics and phenomenology of the processes that link the formation and evolution of …

Intermediate-mass black holes (IMBHs), with masses in the range 1 0 0–1 0 6 M⊙, are the
link between stellar-mass BHs and supermassive BHs (SMBHs). They are thought to be the …

In this paper, we provide updated constraints on the bolometric quasar luminosity function
(QLF) from z= 0 to z= 7. The constraints are based on an observational compilation that …

We present the evolution of black holes (BHs) and their relationship with their host galaxies
in Astrid, a large-volume cosmological hydrodynamical simulation with box size 250 h …

Context. Feedback from accreting supermassive black holes (SMBHs) is often identified as
the main mechanism responsible for regulating star formation in active galactic nucleus …

Scaling relations between central black hole (BH) mass and host galaxy properties are of
fundamental importance to studies of BH and galaxy evolution throughout cosmic time. Here …

We present the discovery of nine quasars at $ z\sim 6$ identified in the Sloan Digital Sky
Survey (SDSS) imaging data. This completes our survey of $ z\sim 6$ quasars in the SDSS …

We assess a model of late cosmic reionization in which the ionizing background radiation
arises entirely from high-redshift quasars and other active galactic nuclei (AGNs). The low …

We present new measurements of the evolution of the X-ray luminosity functions (XLFs) of
unabsorbed and absorbed active galactic nuclei (AGNs) out to z∼ 5. We construct samples …

In the context of observations of the rest-frame ultraviolet and optical emission from distant
galaxies, we explore the emission-line properties of photoionization models of active and …