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We present the first results from a new 250, 350, and 500 micron GalacticPlane survey taken with the Balloon-borne Large-Aperture SubmillimeterTelescope (BLAST) in 2005. This survey's primary goal is to identify andcharacterize high-mass proto-stellar objects (HMPOs). The region studied herecovers 4 sq. deg near the open cluster NGC 6823 in the constellation Vulpecula(l=59). We find 60 compact sources (<60'' diameter) detected simultaneously inall three bands. Their spectral energy distributions (SEDs) are constrainedthrough BLAST, IRAS, Spitzer MIPS, and MSX photometry, with inferred dusttemperatures spanning ~12-40K assuming a dust emissivity index beta=1.5. Theluminosity-to-mass ratio, a distance-independent quantity, spans ~0.2-130L_\odot M_\odot^{-1}. Distances are estimated from coincident 13CO (1->0)velocities combined with a variety of other velocity and morphological data inthe literature. In total, 49 sources are associated with a molecular cloudcomplex encompassing NGC 6823 (distance ~2.3kpc), 10 objects with the PerseusArm (~8.5kpc) and one object is probably in the outer Galaxy (~14kpc). Near NGC6823, the inferred luminosities and masses of BLAST sources span ~40-10^4L_\odot, and ~15-700 M_\odot, respectively. The mass spectrum is compatiblewith molecular gas masses in other high-mass star forming regions. Severalluminous sources appear to be Ultra Compact HII regions powered by early Bstars. However, many of the objects are cool, massive gravitationally-boundclumps with no obvious internal radiation from a protostar, and hence excellentHMPO candidates.

The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) 2005: A 4 sq. deg Galactic Plane Survey in Vulpecula (l=59)