[DSRP Evidence](https://dsrpevidence.org/)

# A selection-aware view of black hole–galaxy coevolution at high redshift

Ziparo et al., 2026, Astronomy & Astrophysics — Astronomy

Patterns: [Systems](https://dsrpevidence.org/pattern/systems), [Relationships](https://dsrpevidence.org/pattern/relationships)

## In short

The black hole (part) and its host galaxy (whole system) are coupled through a mass-scaling relationship whose average form is fixed early in cosmic history, while system-level diversity among individual growth histories shows up specifically as increased scatter in that part-whole relationship rather than a shift in its mean.

## What they found (results)

A forward-modelling Bayesian framework correcting for JWST detection/selection biases on broad-line AGN finds the black hole–stellar mass relation at z~4-6 already matches the local slope and normalization, but with roughly 0.63 dex greater intrinsic scatter than in the nearby universe.

These researchers were not testing DSRP. The finding is theirs; the correspondence to DSRP is drawn by this site.

[Source](https://doi.org/10.1051/0004-6361/202659574)