Identification of a transition from stochastic to secular star formation around $z=9$ with JWST

Understand

Star formation histories (SFH) of early (6$<z<$12) galaxies have been found to be highly stochastic in both simulations and observations, while at $z\lesssim$6 the presence of a main sequence (MS) of star-forming galaxies imply secular processes at play.

• In this work, we aim at characterising the SFH variability of early galaxies as a function of their stellar mass and redshift.
• We use the JADES public catalogue and derive the physical properties of the galaxies as well as their SFH using the spectral energy distribution modelling code CIGALE.
• To this aim, we implement a non-parametric SFH with a flat prior allowing for as much stochasticity as possible.