JWST unveils heavily obscured (active and passive) sources up to z~13

Understand

A wealth of extragalactic populations completely missed at UV-optical wavelengths has been identified in the last decade, combining the deepest HST and Spitzer observations.

• These dark sources are thought to be very dusty and star-forming systems at 3<z<5, and major contributors to the stellar mass build up.
• JWST is now promising to detect such objects well beyond the end of the Epoch of Reionization.
• In this Letter we report an investigation of the deep JWST survey in the SMACS0723 cluster, analysing NIRCam and MIRI images.