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We present a search for companion [CII] emitters to known luminous sources at$6<$ z $<6.5$ in deep, archival ALMA observations. The observations are deepenough to detect sources with L$_{\rm [CII]} \sim 10^8$ at z $\sim6$. Weidentify four robust line detections from a blind search of five deep fieldscentered on ultra-luminous infrared galaxies and QSOs, over an order ofmagnitude more than expected based on current observations and predictions,suggesting that these objects may be highly biased tracers of mass in the earlyUniverse. We find these companion lines to have comparable properties to otherknown galaxies at the same epoch. All companions lie less than 650 km s$^{-1}$and between 20 -- 70 kpc (projected) from their central source, providing aconstraint on their halo masses of the central galaxies ranging from2.5$\times$10$^{12}$ M$_\odot$ to 4$\times$10$^{13}$ M$_\odot$. To place thesediscoveries in context, we employ a mock galaxy catalog to estimate theluminosity function for [CII] during reionization and compare to ourobservations. The simulations support this result by showing a similar level ofelevated counts found around such luminous sources.

Investigating overdensities around z>6 galaxies through ALMA observations of [CII]