The integrated properties of the molecular clouds from the JCMT CO(3-2)
  High Resolution Survey
  We define the molecular cloud properties of the Milky Way first quadrant
using data from the JCMT CO(3-2) High Resolution Survey. We apply the Spectral
Clustering for Interstellar Molecular Emission Segmentation (SCIMES) algorithm
to extract objects from the full-resolution dataset, creating the first catalog
of molecular clouds with a large dynamic range in spatial scale. We identify
$>85\,000$ clouds with two clear sub-samples: $\sim35\,500$ well-resolved
objects and $\sim540$ clouds with well-defined distance estimations. Only 35%
of the cataloged clouds (as well as the total flux encompassed by them) appear
enclosed within the Milky Way spiral arms. The scaling relationships between
clouds with known distances are comparable to the characteristics of the clouds
identified in previous surveys. However, these relations between integrated
properties, especially from the full catalog, show a large intrinsic scatter
($\sim0.5$ dex), comparable to other cloud catalogs of the Milky Way and nearby
galaxies. The mass distribution of molecular clouds follows a truncated-power
law relationship over three orders of magnitude in mass with a form $dN/dM
\propto M^{-1.7}$ with a clearly defined truncation at an upper mass of $M_0
\sim 3 \times 10^6~M_\odot$, consistent with theoretical models of cloud
formation controlled by stellar feedback and shear. Similarly, the cloud
population shows a power-law distribution of size with $dN/dR \propto R^{-2.8}$
with a truncation at $R_0 = 70$ pc.
