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The balloon-borne large aperture submillimeter telescope (BLAST) 2005: a 4 deg2 galactic plane survey in vulpecula (ℓ = 59°)

Chapin, E. L., Ade, Peter A. R., Bock, J. J., Brunt, C., Devlin, M. J., Dicker, S., Griffin, Matthew Joseph, Gundersen, J. O., Halpern, M., Hargrave, Peter Charles, Hughes, D. H., Klein, J., Marsden, Gaelen, Martin, P. G., Mauskopf, Philip Daniel, Netterfield, C. B., Olmi, L., Pascale, Enzo, Patanchon, G., Rex, M., Scott, D., Semisch, C., Truch, M. D. P., Tucker, Carole Elizabeth, Tucker, G. S., Viero, M. P. and Wiebe, D. V. 2008. The balloon-borne large aperture submillimeter telescope (BLAST) 2005: a 4 deg2 galactic plane survey in vulpecula (ℓ = 59°). Astrophysical Journal 681 (1) , pp. 428-452. 10.1086/588544

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Abstract

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 ( = 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 L M−1. 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 L and ~15-700 M, 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: Balloons ; ISM: clouds ; Stars: formation ; Submillimeter
Publisher: American Astronomical Society
ISSN: 0004-637X
Last Modified: 03 Jun 2018 21:18
URI: http://orca.cf.ac.uk/id/eprint/10974

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