![]() We identify a subset of 113 sources with stronger N 2 H + than HCO + integrated intensity, but we find no correlations between the N 2 H + /HCO + ratio and 1.1 mm continuum flux density, gas kinetic temperature, or line width. These intensity correlations are driven by the sensitivity of the 3-2 transitions to excitation conditions rather than by variations in molecular column density or abundance. ![]() We find strong correlations between dense molecular gas integrated intensities and 1.1 mm peak flux and the gas kinetic temperature derived from previously published NH 3 observations. The median observed line width is 3.3 km s –1 consistent with supersonic turbulence within BGPS clumps. ![]() HCO + is very sub-thermally populated and the 3-2 transitions are optically thick toward most BGPS clumps. We characterize the properties of the dense molecular gas emission toward the entire sample. Strong N 2 H + 3-2 emission (T mb > 0.5 K) without HCO + 3-2 emission does not occur in this catalog. We find unique velocities for 3126 (50.5%) of the BGPS v1.0.1 sources observed. This is the largest targeted spectroscopic survey of dense molecular gas in the Milky Way to date. We present spectroscopic observations using the Heinrich Hertz Submillimeter Telescope of the dense gas tracers, HCO + and N 2 H + 3-2, for all 6194 sources in the BGPS v1.0.1 catalog between 7.Â★ ≤ l ≤ 194°. The Bolocam Galactic Plane Survey (BGPS) is a 1.1 mm continuum survey of dense clumps of dust throughout the Galaxy covering 170 deg 2. Ginsburg, Adam Battersby, Cara Stringfellow, Guy Glenn, Jason Bally, John Rosolowsky, Erik Gerner, Thomas Mairs, Steven Dunham, Miranda K. Svoboda, Brian Ellsworth-Bowers, Timothy P. International Nuclear Information System (INIS) A COMPLETE SPECTROSCOPIC CATALOG OF DENSE MOLECULAR GAS OBSERVED TOWARD 1.1 mm DUST CONTINUUM SOURCES WITH 7.Â★ ≤ l ≤ 194°
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