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We present Atacama Large Millimeter/submillimeter Array (ALMA) 870umobservations of 29 bright Herschel sources near high-redshift QSOs. Theobservations confirm that 20 of the Herschel sources are submillimeter-brightgalaxies (SMGs) and identify 16 new SMG-QSO pairs that are useful to studies ofthe circumgalactic medium (CGM) of SMGs. Eight out of the 20 SMGs are blends ofmultiple 870um sources. The angular separations for six of the Herschel-QSOpairs are less than 10", comparable to the sizes of the Herschel beam and theALMA primary beam. We find that four of these six "pairs" are actually QSOshosted by SMGs. No additional submillimeter companions are detected aroundthese QSOs and the rest-frame ultraviolet spectra of the QSOs show no evidenceof significant reddening. Black hole accretion and star formation contributealmost equally in bolometric luminosity in these galaxies. The SMGs hostingQSOs show similar source sizes, dust surface densities, and SFR surfacedensities as other SMGs in the sample. We find that the black holes are growing$\sim$3$\times$ faster than the galaxies when compared to the present-dayblack-hole-galaxy mass ratio, suggesting a QSO duty cycle of $\lesssim$30% inSMGs at z ~ 3. The remaining two Herschel-detected QSOs are undetected at 870umbut each has an SMG "companion" only 9" and 12" away (71 and 95 kpc at z = 3).They could be either merging or projected pairs. If the former, they wouldrepresent a rare class of "wet-dry" mergers. If the latter, the QSOs would, forthe first time, probe the CGM of SMGs at impact parameters below 100 kpc.

astrophysical journal/the astrophysical journal

The Circumgalactic Medium of Submillimeter Galaxies. II. Unobscured QSOs  within Dusty Starbursts and QSO Sightlines with Impact Parameters below 100  Kiloparsec