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We present a measurement of the average supermassive black hole accretionrate (BHAR) as a function of star formation rate (SFR) for galaxies in theredshift range 0.25<z<0.8. We study a sample of 1,767 far-IR selectedstar-forming galaxies in the 9 deg^2 Bo\"otes multiwavelength survey field. TheSFR is estimated using 250 micron observations from the Herschel SpaceObservatory, for which the contribution from the AGN is minimal. In thissample, 121 AGNs are directly identified using X-ray or mid-IR selectioncriteria. We combined these detected AGNs and an X-ray stacking analysis forundetected sources to study the average BHAR for all of the star-forminggalaxies in our sample. We find an almost linear relation between the averageBHAR (in M_sun/year) and the SFR (in M_sun/year) for galaxies across a wide SFRrange 0.85<log SFR<2.56 : log BHAR=(-3.72\pm0.52)+(1.05\pm0.33) log SFR. Thisglobal correlation between SFR and average BHAR is consistent with a simplepicture in which SFR and AGN activity are tightly linked over galaxy evolutiontimescales.

A correlation between star formation rate and average black hole accretion in star forming galaxies