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We present a long-term, multi-wavelength project to understand the epoch offastest growth of the most massive black holes by using a sample of 40 luminousquasars at z~4.8. These quasars have rather uniform properties, with typicalaccretion rates and black hole masses of L/L_Edd~0.7 and M_BH~10^9 M_sol. Thesample consists of "FIR-bright" sources with a previous Herschel/SPIREdetection, suggesting SFR > 1000 M_sol/yr, as well as of "FIR-faint" sourcesfor which Herschel stacking analysis implies a typical SFR of ~400 M_sol/yr.Six of the quasars have been observed by ALMA in [CII]{\lambda}157.74 micronline emission and adjacent rest-frame 150 micron continuum, to study the dustycold ISM. ALMA detected companion, spectroscopically confirmed sub-mm galaxies(SMGs) for three sources - one FIR-bright and two FIR-faint. The companions areseparated by ~14-45 kpc from the quasar hosts, and we interpret them as majorgalaxy interactions. Our ALMA data therefore clearly support the idea thatmajor mergers may be important drivers for rapid, early SMBH growth. However,the fact that not all high-SFR quasar hosts are accompanied by interactingSMGs, and their ordered gas kinematics observed by ALMA, suggest that otherprocesses may be fueling these systems. Our analysis thus demonstrates thediversity of host galaxy properties and gas accretion mechanisms associatedwith early and rapid SMBH growth.

Fast-growing SMBHs in Fast-growing Galaxies, at High Redshifts: the Role of Major Mergers as Revealed by ALMA