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The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) 2005: A 4 deg2 Galactic Plane Survey in Vulpecula (ℓ = 59°)

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E. L. Chapin1, P. A. R. Ade2, J. J. Bock3,4, C. Brunt5, M. J. Devlin6, S. Dicker6, M. Griffin2, J. O. Gundersen7, M. Halpern1, P. C. Hargrave2, D. H. Hughes8, J. Klein6, G. Marsden1, P. G. Martin9,10, P. Mauskopf2, C. B. Netterfield10,11, L. Olmi12,13, E. Pascale11, G. Patanchon1,14, M. Rex6, D. Scott1, C. Semisch6, M. D. P. Truch15, C. Tucker2, G. S. Tucker15, M. P. Viero10 and D. V. Wiebe11

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We present the first results from a new 250, 350, and 500 μm Galactic plane survey taken with the Balloon-borne Large-Aperture Submillimeter Telescope (BLAST) in 2005. This survey's primary goal is to identify and characterize high-mass protostellar objects (HMPOs). The region studied here covers 4 deg2 near the open cluster NGC 6823 in the constellation Vulpecula (ℓ = 59°). We find 60 compact sources (<60'' diameter) detected simultaneously in all three bands. Their SEDs are constrained through BLAST, IRAS, Spitzer MIPS, and MSX photometry, with inferred dust temperatures spanning ~12-40 K assuming a dust emissivity index β = 1.5. The luminosity-to-mass ratio, a distance-independent quantity, spans ~0.2-130 Lsun M−1sun. Distances are estimated from coincident 13CO(1→ 0) velocities combined with a variety of other velocity and morphological data in the literature. In total, 49 sources are associated with a molecular cloud complex encompassing NGC 6823 (distance ~2.3 kpc), 10 objects with the Perseus arm (~8.5 kpc), and one object is probably in the outer Galaxy (~14 kpc). Near NGC 6823, the inferred luminosities and masses of BLAST sources span ~40-104 Lsun and ~15-700 Msun, respectively. The mass spectrum is compatible with molecular gas masses in other high-mass star-forming regions. Several luminous sources appear to be ultracompact H II regions powered by early B stars. However, many of the objects are cool, massive gravitationally bound clumps with no obvious internal radiation from a protostar, and hence excellent HMPO candidates.

Subject headings

balloons; ISM: clouds; stars: formation; submillimeter


Dates

Issue 1 (2008 July 1)

Received 2007 May 29, accepted for publication 2007 October 26



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