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We present a survey of the [CII] 158 $\mu$m line and underlying far-infrared(FIR) dust continuum emission in a sample of 27 z>6 quasars using the AtacamaLarge Millimeter Array (ALMA) at ~1" resolution. The [CII] line wassignificantly detected (at >5-sigma) in 23 sources (85%). We find typical lineluminosities of $L_{\rm [CII]}=10^{9-10}$ L$_\odot$, and an average line widthof ~385 km/s. The [CII]-to-far-infrared luminosity ratio ([CII]/FIR) in oursources span one order of magnitude, highlighting a variety of conditions inthe star-forming medium. Four quasar host galaxies are clearly resolved intheir [CII] emission on a few kpc scales. Basic estimates of the dynamicalmasses of the host galaxies give masses between $2\times10^{10}$ and$2\times10^{11}$ M$_\odot$, i.e., more than an order of magnitude below what isexpected from local scaling relations, given the available limits on the massesof the central black holes ($>3\times10^8$ M$_\odot$, assumingEddington-limited accretion). In stacked ALMA [CII] spectra of individualsources in our sample, we find no evidence of a deviation from a singleGaussian profile. The quasar luminosity does not strongly correlate with eitherthe [CII] luminosity or equivalent width. This survey (with typical on-sourceintegration times of 8 min) showcases the unparalleled sensitivity of ALMA atmillimeter wavelengths, and offers a unique reference sample for the study ofthe first massive galaxies in the universe.

An ALMA [CII] survey of 27 quasars at z>5.94