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We present an expanded distance catalog for 1,710 molecular cloud structuresidentified in the Bolocam Galactic Plane Survey (BGPS) version 2, representinga nearly threefold increase over the previous BGPS distance catalog. Weadditionally present a new method for incorporating extant data sets into ourBayesian distance probability density function (DPDF) methodology. To augmentthe dense-gas tracers (e.g., HCO+(3-2), NH3(1,1)) used to derive line-of-sightvelocities for kinematic distances, we utilize the Galactic Ring Survey13CO(1-0) data to morphologically extract velocities for BGPS sources. Theoutline of a BGPS source is used to select a region of the GRS 13CO data, alongwith a reference region to subtract enveloping diffuse emission, to produce aline profile of 13CO matched to the BGPS source. For objects with a HCO+(3-2)velocity, \approx 95% of the new 13CO(1-0) velocities agree with that of thedense gas. A new prior DPDF for kinematic distance ambiguity (KDA) resolution,based on a validated formalism for associating molecular cloud structures withknown objects from the literature, is presented. We demonstrate this priorusing catalogs of masers with trigonometric parallaxes and HII regions withrobust KDA resolutions. The distance catalog presented here containswell-constrained distance estimates for 20% of BGPS V2 sources, with typicaldistance uncertainties \lesssim 0.5 kpc. Approximately 75% of thewell-constrained sources lie within 6 kpc of the Sun, concentrated in theScutum-Centarus arm. Galactocentric positions of objects additionally trace outportions of the Sagittarius, Perseus, and Outer arms in the first and secondGalactic quadrants, and we also find evidence for significant regions ofinterarm dense gas.

The Bolocam Galactic Plane Survey. XII. Distance Catalog Expansion Using Kinematic Isolation of Dense Molecular Cloud Structures With 13CO(1-0)