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The James Webb Space Telescope (JWST) observations have revolutionized extragalactic research, particularly with the discovery of low-luminosity active galactic nuclei (AGNs) at high redshifts, powered by accreting black holes (BHs) with masses of 10^6-8 Msun. These AGN populations are crucial for understanding early BH assembly and coevolution with their host galaxies. Several remarkable findings distinguish these JWST-identified AGNs from their low-redshift counterparts: (1) their abundance is 1-2 orders of magnitude higher than that of bright quasars, (2) the BH-to-galaxy mass ratio appears significantly higher than the local relationship, and (3) strong absorption features are often seen on top of Balmer emission lines. In this talk, I will review these new results from the first-round of JWST observations, explore theoretical explanations and predictions for those aspects, and propose potentially interesting observations to further investigate the early BH population.
Dr. Inayoshi is an associate professor in Kavli Institute for Astronomy and Astrophysics, Peking University. Before joining KIAA in the fall of 2018, Dr. Inayoshi spent 4 years at Columbia University in US as a Junior Simons Fellow. He received his Ph.D. in physics from Kyoto University, Japan, in 2014.
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