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Astrophysics with Submillimeter Galactic Plane Surveys

The advent of large format bolometers arrays have made it possible to survey the Galaxy and search for embedded sites of star formation in a much less biased way than previous studies.  The Bolocam Galactic Survey (BGPS) is a continuum survey 1.1 mm at 30″ resolution of over 200 square degrees covering the entire first quadrant and selected regions in the second, third, and fourth quadrants.  Over 8000 clumps have been identified in the recently released version 2.0 maps.  A spectroscopic survey in the dense gas tracers HCO+ and N2H+ have identified unique velocities for 3126 sources in the BGPS (Shirley et al. 2013).   This is the largest targeted survey of dense gas in the Milky Way.  I shall describe the v2.0 BGPS data release and results from the dense molecular gas spectroscopic survey.  I shall also describe efforts by the BGPS team to develop a Bayesian method for quantifying the probability that a source lies at a particular heliocentric distance (resolution of the kinematic distance ambiguity in the first quadrant). Using Distance Probability Density Functions (DPDFs) for a subset of sources, I shall then characterize the physical properties of clumps observed in the BGPS. The kinematic catalog and resulting DPDFs will be an important resource for future global star formation studies in the Milky Way.

Cody Hall

Yancy Shirley (Arizona)

October 11, 2013
14:00 - 15:00