HCO+ and N2H+ Spectroscopy of Sources in the Bolocam Galactic Plane Survey

Details HCO+ and N2H+ Spectroscopy of Sources in the Bolocam Galactic Plane Survey HCO+ and N2H+ Spectroscopy of Sources in the Bolocam Galactic Plane Survey

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741103s&link_type=abstract

American Astronomical Society, AAS Meeting #217, #411.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present the results of observations of 1882 sources in the Bolocam Galactic Plane Survey (BGPS) at 1.1mm with the 10m Heinrich Hertz Telescope simultaneously in HCO+ J = 3 - 2 and N2H+ J = 3 - 2. We detect 77% of these sources in HCO+ and 51% in N2H+. We find a strong correlation between both dense gas tracers and the 1.1 mm dust emission of BGPS sources. We determine kinematic distances and break the distance ambiguity for 435 sources for which we derive the size, mass, and average density. The median size of BGPS clumps is 0.86 pc with a median mass of 330 Msun. The median HCO+ linewidth is 3.1 km/s indicating that BGPS clumps are dominated by supersonic turbulence or unresolved kinematic motions. We find no evidence for a size-linewidth relationship for BGPS clumps. We analyze the effects of the assumed dust temperature on the derived clump properties with a Monte Carlo simulation. The observed differential mass histogram has a power-law slope that is intermediate between that observed for diffuse CO clouds and the stellar IMF. BGPS clumps represent a wide range of objects (from dense cores to more diffuse clumps) and are typically characterized by larger sizes and lower densities than previous published surveys of high-mass star forming regions. This collection of objects is a less-biased sample of star forming regions in the Milky Way that likely span a wide range of evolutionary states.

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