Speaker
Description
We investigate the spatially resolved star formation histories (SFHs) of seven post-starburst (PSB) galaxies at $z \approx 0.6$--$1.0$ using multi-band imaging from the JWST/PRIMER--COSMOS and HST/CANDELS surveys. Combining rest-frame UV--to--near-IR coverage ($0.4$--$4.4~\mu$m), we perform pixel-by-pixel SED fitting to reconstruct the radial SFHs of individual galaxies. We first apply a non-parametric continuity model to obtain flexible baseline histories, followed by fitting a parametric Gaussian burst–quench (GBQ) model that captures the sample’s burst–quench behavior. Our goal is to test whether PSB galaxies exhibit central starbursts and whether their star formation was quenched from the inside out or synchronously across all radii. By resolving the SFHs across different galactic regions, we derive radial profiles of the specific star formation rate $\mathrm{sSFR}(R)$, the quenching time $t_{\rm quench}(R)$, and the quenching timescale, $\tau_{\rm quench}(R)$, revealing how the timing and speed of quenching vary within each galaxy. Comparing these spatially resolved trends with previous spectroscopic and photometric studies provides observational validation of the physical mechanisms driving rapid quenching and structural transformation at intermediate redshift.
| Participate the oral/poster presentation award competition | Yes |
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