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Properties of Ultralight Bosons from Spins of Heavy Quasars via Superradiance
Caner Unal, Fabio Pacucci, Abraham Loeb
The mass and the spin of accreting and jetted black holes, at the center of Active Galactic Nuclei (AGNs), can be probed by analyzing their electromagnetic spectra. For this purpos…
Measurements of the z ~ 6 Intergalactic Medium Optical Depth and Transmission Spikes Using a New z > 6.3 Quasar Sample
Jinyi Yang, Feige Wang, Xiaohui Fan +9
We report new measurements of the intergalactic medium (IGM) Ly and Ly effective optical depth at , using a new sample of quasar sightlines including 32 quasars at…
Finding Direct-Collapse Black Holes at Birth
Daniel J. Whalen, Marco Surace, Carla Bernhardt +4
Direct-collapse black holes (DCBHs) are currently one of the leading contenders for the origins of the first quasars in the universe, over 300 of which have now been found at …
Effects of the Hubble Parameter on the Cosmic Growth of the First Quasars
Rafael C. Nunes, Fabio Pacucci
Supermassive black holes (SMBHs) play a crucial role in the evolution of galaxies and are currently detected up to . Theories describing black hole (BH) growth are chall…
Separating Accretion and Mergers in the Cosmic Growth of Black Holes with X-ray and Gravitational Wave Observations
Fabio Pacucci, Abraham Loeb
Black holes across a broad range of masses play a key role in the evolution of galaxies. The initial seeds of black holes formed at and grew over cosmic time by gas acc…