Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) 2005: A
  4 sq. deg Galactic Plane Survey in Vulpecula (l=59)   We present the first results from a new 250, 350, and 500 micron 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 proto-stellar objects (HMPOs). The region studied here
covers 4 sq. deg 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 spectral energy distributions (SEDs) are constrained
through BLAST, IRAS, Spitzer MIPS, and MSX photometry, with inferred dust
temperatures spanning ~12-40K assuming a dust emissivity index beta=1.5. The
luminosity-to-mass ratio, a distance-independent quantity, spans ~0.2-130
L_\odot M_\odot^{-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 ~2.3kpc), 10 objects with the Perseus
Arm (~8.5kpc) and one object is probably in the outer Galaxy (~14kpc). Near NGC
6823, the inferred luminosities and masses of BLAST sources span ~40-10^4
L_\odot, and ~15-700 M_\odot, respectively. The mass spectrum is compatible
with molecular gas masses in other high-mass star forming regions. Several
luminous sources appear to be Ultra Compact HII 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.

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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: q-alg