Massive black holes (MBHs) inhabit galactic centres, and power luminous quasars and
active galactic nuclei, shaping their cosmic environment with the energy they produce. The …

The existence of∼ 109M⊙ supermassive black holes (SMBHs) within the first billion years
of the Universe has stimulated numerous ideas for the prompt formation and rapid growth of …

Quasars are the most luminous non-transient objects known and as a result they enable
studies of the Universe at the earliest cosmic epochs. Despite extensive efforts, however, the …

How quasars powered by supermassive black holes formed less than a billion years after
the Big Bang is still one of the outstanding problems in astrophysics, 20 years after their …

In recent years, the discovery of massive quasars at has provided a striking challenge to our
understanding of the origin and growth of supermassive black holes in the early Universe …

We report initial results from a large Gemini program to observe z≳ 5.7 quasars with GNIRS
near-IR spectroscopy. Our sample includes 50 quasars with simultaneous∼ 0.85–2.5 μm …

Studying quasars at the highest redshifts can constrain models of galaxy and black hole
formation, and it also probes the intergalactic medium in the early universe. Optical surveys …

We present coupled stellar evolution (SE) and 3D radiation-hydrodynamic (RHD)
simulations of the evolution of primordial protostars, their immediate environment, and the …

Massive black holes (BHs) inhabit local galaxies, including the Milky Way and some dwarf
galaxies. BH formation, occurring at early cosmic times, must account for the properties of …

Recent discoveries of massive black holes (MBHs) in dwarf galaxies suggest that they may
have a more common presence than once thought. Systematic searches are revealing more …