The JCMT and Herschel Gould Belt Surveys: a comparison of SCUBA-2 and Herschel data of dense cores in the Taurus dark cloud L1495
Date Issued
2016
Author(s)
Ward-Thompson, D.
•
Pattle, K.
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Kirk, J. M.
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Marsh, K.
•
Buckle, J.
•
Hatchell, J.
•
Nutter, D. J.
•
Griffin, M. J.
•
Di Francesco, J.
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André, P.
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Beaulieu, S.
•
Berry, D.
•
Broekhoven-Fiene, H.
•
Currie, M.
•
Fich, M.
•
Jenness, T.
•
Johnstone, D.
•
Kirk, H.
•
Mottram, J.
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Pineda, J.
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Quinn, C.
•
Sadavoy, S.
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Salji, C.
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Tisi, S.
•
Walker-Smith, S.
•
White, G.
•
Hill, T.
•
Könyves, V.
•
Palmeirim, P.
•
Abstract
We present a comparison of Submillimetre Common User Bolometer Array-2 (SCUBA-2) 850-μm and Herschel 70-500-μm observations of the L1495 filament in the Taurus Molecular Cloud with the goal of characterizing the SCUBA-2 Gould Belt Survey (GBS) data set. We identify and characterize starless cores in three data sets: SCUBA-2 850-μm, Herschel 250-μm, and Herschel 250-μm spatially filtered to mimic the SCUBA-2 data. SCUBA-2 detects only the highest-surface-brightness sources, principally detecting protostellar sources and starless cores embedded in filaments, while Herschel is sensitive to most of the cloud structure, including extended low-surface-brightness emission. Herschel detects considerably more sources than SCUBA-2 even after spatial filtering. We investigate which properties of a starless core detected by Herschel determine its detectability by SCUBA-2, and find that they are the core's temperature and column density (for given dust properties). For similar-temperature cores, such as those seen in L1495, the surface brightnesses of the cores are determined by their column densities, with the highest-column-density cores being detected by SCUBA-2. For roughly spherical geometries, column density corresponds to volume density, and so SCUBA-2 selects the densest cores from a population at a given temperature. This selection effect, which we quantify as a function of distance, makes SCUBA-2 ideal for identifying those cores in Herschel catalogues that are closest to forming stars. Our results can now be used by anyone wishing to use the SCUBA-2 GBS data set.
Volume
463
Issue
1
Start page
1008
Issn Identifier
0035-8711
Ads BibCode
2016MNRAS.463.1008W
Rights
open.access
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