9 papers
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,…
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…
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-…
Little Red Dots and their Progenitors from Direct Collapse Black Holes
Junehyoung Jeon, Boyuan Liu, Volker Bromm +7
The James Webb Space Telescope (JWST) has discovered a new population of objects, the Little Red Dots (LRDs), characterized by V-shaped spectra indicative of strong breaks around t…
A GLIMPSE of Intermediate Mass Black holes in the epoch of reionization: Witnessing the Descendants of Direct Collapse?
Qinyue Fei, Seiji Fujimoto, Rohan P. Naidu +17
JWST has revealed an abundance of supermassive black holes (BHs) in the early Universe, and yet the lowest mass seed black holes that gave rise to these populations remain elusive.…
The Emerging Black Hole Mass Function in the High-Redshift Universe
Junehyoung Jeon, Boyuan Liu, Anthony J. Taylor +5
Observations with the James Webb Space Telescope (JWST) have identified an abundant population of supermassive black holes (SMBHs) already in place during the first few hundred mil…