A recently quenched galaxy 700 million years after the Big Bang

TL;DR

This paper reports the discovery of a mini-quenched galaxy at redshift 7.3, providing observational evidence of rapid star formation and quenching in the early universe, crucial for understanding galaxy formation models.

Contribution

First observational evidence of a mini-quenched galaxy at z=7.3, shedding light on early galaxy quenching processes and starburst behavior in the primordial universe.

Findings

Galaxy experienced a short starburst followed by rapid quenching.

Stellar mass of the galaxy is between 4-6×10^8 solar masses.

Spectrum shows a Balmer break with no nebular emission lines.

Abstract

Local and low-redshift ($z$<$3$) galaxies are known to broadly follow a bimodal distribution: actively star forming galaxies with relatively stable star-formation rates, and passive systems. These two populations are connected by galaxies in relatively slow transition. In contrast, theory predicts that star formation was stochastic at early cosmic times and in low-mass systems: these galaxies transitioned rapidly between starburst episodes and phases of suppressed star formation, potentially even causing temporary quiescence -- so-called mini-quenching events. However, the regime of star-formation burstiness is observationally highly unconstrained. Directly observing mini-quenched galaxies in the primordial Universe is therefore of utmost importance to constrain models of galaxy formation and transformation. Early quenched galaxies have been identified out to redshift $z<5$, and these are all found to be massive ($M_{*}>10^{10}~M_{\odot}$) and relatively old. Here we report a (mini-)quenched galaxy at z$=$7.3, when the Universe was only 700~Myr old. The JWST/NIRSpec spectrum is very blue ($U$-$V$$=$0.16$\pm0.03$~mag), but exhibits a Balmer break and no nebular emission lines. The galaxy experienced a short starburst followed by rapid quenching; its stellar mass (4-6$\times 10^8~M_\odot$) falls in a range that is sensitive to various feedback mechanisms, which can result in perhaps only temporary quenching.