Kavli Affiliate: John D. Silverman
| First 5 Authors: Takumi S. Tanaka, John D. Silverman, Yurina Nakazato, Masafusa Onoue, Kazuhiro Shimasaku
| Summary:
The current paradigm for the co-evolution of galaxies and their supermassive
black holes postulates that dust-obscured active galactic nuclei (AGNs)
represent a transitional phase towards a more luminous and unobscured state.
However, our understanding of dusty AGNs and their host galaxies at early
cosmic times is inadequate due to observational limitations. Here, we present
JWST observations of CID-931, an X-ray-detected AGN at a spectroscopic redshift
of $z_{rm spec}=4.91$. Multiband NIRCam imaging from the COSMOS-Web program
reveals an unresolved red core, similar to JWST-discovered dusty AGNs.
Strikingly, the red core is surrounded by at least eight massive star-forming
clumps spread over $1.!!^{primeprime}6 approx 10~{rm kpc}$, each of which
has a stellar mass of $10^9-10^{10}M_odot$ and $sim0.1-1~{rm kpc}$ in
radius. The whole system amounts to $10^{11}M_odot$ in stellar mass, higher
than typical star-forming galaxies at the same epoch. In this system, gas
inflows and/or complex merger events may trigger clump formation and AGN
activity thus leading to the rapid formation of a massive galaxy hosting a
supermassive black hole. Future follow-up observations will provide new
insights into the evolution of the galaxy-black hole relationship during such
transitional phases in the early universe.
| Search Query: ArXiv Query: search_query=au:”John D. Silverman”&id_list=&start=0&max_results=3