Overview
- The Nature Astronomy paper published Monday, Aug. 24, 2026, stacked 217 'little red dot' images from the JWST COSMOS‑Web survey to detect faint rest‑frame optical light around these sources.
- The team removed each image's central point‑source light and combined the results to recover an extended host that contributes roughly 10% of the observed red light.
- Modeling of the stacked signal gives host stellar masses near 10^9 solar masses and average radii of about 685 light‑years, making these hosts unusually compact compared with peers at the same epoch.
- The central, outshining emission is consistent with rapidly accreting young supermassive black holes and implies substantial black‑hole mass growth before most of the host stars formed.
- Key uncertainties remain because stacking and JWST surface‑brightness limits can hide diversity in the sample, so spectroscopic redshifts, X‑ray or radio follow‑up, and deeper imaging are needed to confirm individual black‑hole masses and the role of dust.