A Constant Ratio between Black Hole Accretion and Star Formation in IR-bright AGNs

We study the relationship between the X-ray luminosity and star formation rate (SFR) in a sample of farinfrared(FIR)-detected active galactic nuclei (AGNs). This IR-bright AGN sample consists of 828 objects in 0.2 2.5 IR-bright AGNs yields consistent flat slopes, indicating little to no redshift effect. This constant mass accretion ratio coincides with the accumulated mass ratio between SMBH and host stellar mass in the local universe. Our results support the secular evolution picture, where the SMBH are growing at a relatively constant rate with the host galaxy, possibly from a common gas supply,regardless of the level of accretion activity or the mass of the SMBH.