Oral Presentation

Obscured cosmic black hole accretion history from dusty AGN found with the JWST/MIRI

Author(s): Tomo Goto, Hsieh, Cheng-An; Ling, Chih-Teng ; Kim, Seong Jin (NTHU) ; Hashimoto, Tetsuya (NCHU); Chien, Tom C.-C. ; Chen, Amos Y.-A (NTHU)

Presenter: Tomo Goto (NTHU)

We determine the black hole accretion history (BHAH) of obscured Active Galactic Nuclei (AGNs) identified in the JWST CEERS survey using mid-infrared (MIR) SED fitting. We construct MIR Luminosity Functions (LFs) for these sources using modified Schechter and double power law models, deriving a corresponding BHAD. The measured BHAD probe luminosities as low as 10^7 Lsun, extending two orders of magnitude fainter than pre-JWST studies. Our results show that the BHAD peaks between z=1 and 3. The potential scenario of AGN activity peaking before cosmic star formation, suggested by these early JWST results, challenges existing black hole formation theories. Furthermore, at z~3, BHAD appears higher than X-ray estimates, supporting the idea that MIR observations are more effective in detecting obscured AGNs missed by X-ray surveys, though this difference requires confirmation with larger samples. These findings demonstrate the exceptional potential of JWST to significantly advance our understanding of galaxy and AGN co-evolution.