Star formation at the smallest scales; A JWST study of the clump populations in SMACS0723

Understand

We present the clump populations detected in 18 lensed galaxies at redshifts 1 to 8.5 within the lensing cluster field SMACS0723.

• The recent JWST Early Release Observations of this poorly known region of the sky have revealed numerous point-like sources within and surrounding their host galaxies, undetected in the shallower HST images.
• We use JWST multiband photometry and the lensing model of this galaxy cluster to estimate the intrinsic sizes and magnitudes of the stellar clumps.
• We derive optical restframe effective radii from $<$10 to 100s pc and masses ranging from $\sim10^5$ to $10^9$ M$_{\odot}$, overlapping with massive star clusters in the local universe.