Speaker
Description
We investigate the physical drivers of active galactic nucleus (AGN) luminosity and its connection to host galaxy evolution across cosmic time using a multi-wavelength dataset from the \textit{James Webb Space Telescope} (JWST) SMILES and JADES surveys. Our sample consists of 2,735 galaxies spanning lookback times from 0.8 to 13.6 Gyr ($z \gtrsim 0$--17), with robust spectral energy distribution (SED) fitting performed using \texttt{CIGALE} to derive key physical properties, including stellar mass, star formation rate (SFR), dust luminosity, stellar age, and AGN contribution ($frac_{\rm AGN}$).
We perform correlation analysis and principal component analysis (PCA) to identify the dominant factors governing AGN activity. We find that AGN luminosity ($\log L_{\rm AGN}$) correlates strongly with recent star-forming activity ($\log \mathrm{SFR}_{10\,\mathrm{Myr}}$) and dust luminosity ($\log L_{\rm dust}$), indicating a shared dependence on cold gas reservoirs. In contrast, stellar age and star formation history (SFH) duration show moderate negative correlations, suggesting that AGN activity preferentially occurs in younger systems. Stellar mass exhibits a secondary positive correlation, acting as a scaling factor rather than a primary driver.
PCA reveals that the majority of variance ($>90\%$) is captured by two components: an activity/scale axis linking AGN power, SFR, and dust emission, and an evolution axis tracing stellar age. We identify a peak in the dominance of the activity axis at intermediate redshifts, where galaxy mass and energetic output are most tightly coupled. At higher redshifts, AGN accretion, star formation, and dust heating become increasingly synchronized, reflecting gas-rich conditions in the early universe.
Our results demonstrate that AGN luminosity is primarily governed by the host galaxy's current gas supply and recent star formation, with galaxy mass setting the overall potential. This highlights a co-evolution scenario in which black hole growth and star formation are tightly linked, particularly at early cosmic epochs.
| Participate the oral/poster presentation award competition | No |
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