Evident black hole-bulge coevolution in the distant universe

Understand

Observations in the local universe show a tight correlation between the masses of supermassive black holes (SMBHs; $M_{\rm BH}$) and host-galaxy bulges ($M_{\rm bulge}$), suggesting a strong connection between SMBH and bulge growth.

• However, direct evidence for such a connection in the distant universe remains elusive.
• We have studied sample-averaged SMBH accretion rate ($\overline{\rm BHAR}$) for bulge-dominated galaxies at $z=0.5-3$.
• While previous observations found $\overline{\rm BHAR}$ is strongly related to host-galaxy stellar mass ($M_\star$) for the overall galaxy population, our analyses show that, for the bulge-dominated population, $\overline{\rm BHAR}$ is mainly related to SFR rather than $M_\star$.