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The Bolocam Galactic Plane Survey (BGPS) is a 1.1 mm continuum survey ofdense clumps of dust throughout the Galaxy covering 170 square degrees. Wepresent spectroscopic observations using the Heinrich Hertz SubmillimeterTelescope of the dense gas tracers, HCO+ and N2H+ 3-2, for all 6194 sources inthe Bolocam Galactic Plane Survey v1.0.1 catalog between 7.5 <= l <= 194degrees. This is the largest targeted spectroscopic survey of dense moleculargas in the Milky Way to date. We find unique velocities for 3126 (50.5%) of theBGPS v1.0.1 sources observed. Strong N2H+ 3-2 emission (T_{mb} > 0.5 K) withoutHCO+ 3-2 emission does not occur in this catalog. We characterize theproperties of the dense molecular gas emission toward the entire sample. HCO+is very sub-thermally populated and the 3-2 transitions are optically thicktoward most BGPS clumps. The median observed line width is 3.3 km/s consistentwith supersonic turbulence within BGPS clumps. We find strong correlationsbetween dense molecular gas integrated intensities and 1.1 mm peak flux and thegas kinetic temperature derived from previously published NH3 observations.These intensity correlations are driven by the sensitivity of the 3-2transitions to excitation conditions rather than by variations in molecularcolumn density or abundance. We identify a subset of 113 sources with strongerN2H+ than HCO+ integrated intensity, but we find no correlations between theN2H+ / HCO+ ratio and 1.1 mm continuum flux density, gas kinetic temperature,or line width. Self-absorbed profiles are rare (1.3%).

the astrophysical journal. supplement series/astrophysical journal. supplement series

The Bolocam Galactic Plane Survey. X. A Complete Spectroscopic Catalog  of Dense Molecular Gas Observed toward 1.1 mm Dust Continuum Sources with 7.5  <= l <= 194 degrees