29 citations · 58 across the 14 of their papers we have counts for
5 papers · 1 filter
Early Supermassive Black Holes and Little Red Dots Require Free-Fall Growth
Junehyoung Jeon, Volker Bromm, Michael Boylan-Kolchin +1
Supermassive black holes/active galactic nuclei (SMBHs/AGN), forming only a few hundred million years after the Big Bang as observed with the James Webb Space Telescope (JWST), cha…
The Road to Normalcy: Environment-Driven Evolutionary Pathways for Primordial Black Holes
Saiyang Zhang, Junehyoung Jeon, Boyuan Liu +2
We investigate how cosmological environment regulates the evolution of primordial black hole (PBH) seeds in the early universe using a suite of hydrodynamical simulations. Unlike t…
A Rapid Evolution in the Observed Mbh/M* Relation at z > 3 Revealed via Spectro-photometric SED-Modeling
Ansh R. Gupta, Anthony Taylor, Emma Curtis-Lake +33
Spectroscopic observations from JWST have uncovered a plethora of active galactic nuclei (AGN) at z > 4 with black hole (BH) mass (Mbh) to stellar mass (M*) ratios significantly ab…
What is Powering the Enigmatic He II Emitter Hebe: The First Stars or Black Holes?
Junehyoung Jeon, Tae Bong Jeong, Saiyang Zhang +1
Recent high-resolution spectroscopy with the James Webb Space Telescope (JWST) has confirmed the presence of a strong He II emitting clump in the vicinity of GN-z11,…
Hunting for the First Explosions at the High-Redshift Frontier
Junehyoung Jeon, Volker Bromm, Alessandra Venditti +2
The James Webb Space Telescope (JWST) has spectroscopically confirmed galaxies up to , 300 Myr after the Big Bang, and several candidates have been discovered at $z\sim15-…