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Redshift evolution of the MBH–M* relation

Ascertain whether and how the relation between supermassive black hole mass (MBH) and host-galaxy stellar mass (M*) evolves with redshift (z ≳ 1) and quantify that evolution.

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Background

While numerous studies at low redshift have established a tight MBH–M* relation, extending these measurements to higher redshift is observationally challenging. Prior to JWST, near-infrared constraints and host–AGN decompositions were limited, leading to uncertainties in measuring host stellar masses at z > 1.

Given the small and heterogeneous samples and uncertainties in black hole mass and host stellar mass estimates for high-z AGNs, the true redshift evolution of the MBH–M* relation is not firmly established.

References

Therefore, the redshift evolution of the mass relation remains highly uncertain.

— The $M_{\rm BH}-M_*$ relation up to $z\sim2$ through decomposition of COSMOS-Web NIRCam images (2401.13742 - Tanaka et al., 24 Jan 2024) in Section 1 (Introduction)