A massive MS galaxy at z~3, observed with both JWST and ALMA revealed the presence of mass structures associated with SF. 

- substructures routinely identified in JWST studies (spiral arms, ...) but ALMA obs usually do not have the resolution to match them (see Wu+2023 Chen+2023)

This normal SF galaxy with  90% of SF and 70% of stellar mass concentrated in star-burst core. Substructures in stellar mass are spatially coincident with substructures in ALMA 240um continuum flux : SF associated to off-center substructures in stellar mass (substructures contain 5%SF, 10-30% stellar mass).

The stellar-mass substructures with ongoing SF might be a  forming spiral arm or other types of disk instability from minor merger or interactions in an overdense environment (companions within 70kpc).

The location of the bulk of the stellar mass buildup is revealed to be co-located with the starburst core, affording a clearer picture of the galactic bulge during its assembly, and also galactic-disk substructures actively forming stars. Indicating a connection between disk instabilities and SF. 

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