JWST CEERS and JADES Active Galaxies at z = 4–7 Violate the Local M •–M ⋆ Relation at >3σ: Implications for Low-mass Black Holes and Seeding Models

Abstract

Abstract JWST is revolutionizing our understanding of the high- z Universe by expanding the black hole horizon, looking farther and to smaller masses, and revealing the stellar light of their hosts. By examining JWST galaxies at z = 4–7 that host H α -detected black holes, we investigate (i) the high- z M • – M ⋆ relation and (ii) the black hole mass distribution, especially in its low-mass range ( M • ≲ 10 6.5 M ⊙ ). With a detailed statistical analysis, our findings conclusively reveal a high- z M • – M ⋆ relation that deviates at >3 σ confidence level from the local relation. The high- z relation is log ( M • / M ⊙ ) = − 2.43 − 0.83 + 0.83 + 1.06 − 0.09 + 0.09 log ( M ⋆ / M ⊙ ) . Black holes are overmassive by ∼10–100× compared to their low- z counterparts in galactic hosts of the same stellar mass. This fact is not due to a selection effect in surveys. Moreover, our analysis predicts the possibility of detecting in high- z JWST surveys 5–15× more black holes with M • ≲ 10 6.5 M ⊙ , and 10–30× more with M • ≲ 10 8.5 M ⊙ , compared to local relation’s predictions. The lighter black holes preferentially occupy galaxies with a stellar mass of ∼10 7.5 –10 8 M ⊙ . We have yet to detect these sources because (i) they may be inactive (duty cycles 1%–10%), (ii) the host overshines the active galactic nucleus (AGN), or (iii) the AGN is obscured and not immediately recognizable by line diagnostics. A search of low-mass black holes in existing JWST surveys will further test the M • – M ⋆ relation. Current JWST fields represent a treasure trove of black hole systems at z = 4–7; their detection will provide crucial insights into their early evolution and coevolution with their galactic hosts.