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The JCMT and Herschel Gould Belt Surveys: a comparison of SCUBA-2 and Herschel data of dense cores in the Taurus dark cloud L1495

Ward-Thompson, D., Pattle, K., Kirk, J. M., Marsh, K., Buckle, J., Hatchell, J., Nutter, D. J., Griffin, Matthew Joseph, Di Francesco, J., André, P., Beaulieu, S., Berry, D., Broekhoven-Fiene, H., Currie, M., Fich, M., Jenness, T., Johnstone, D., Kirk, H., Mottram, J., Pineda, J., Quinn, C., Sadavoy, S., Salji, C., Tisi, S., Walker-Smith, S., White, G., Hill, T., Könyves, V., Palmeirim, P. and Pezzuto, S. 2016. The JCMT and Herschel Gould Belt Surveys: a comparison of SCUBA-2 and Herschel data of dense cores in the Taurus dark cloud L1495. Monthly Notices of the Royal Astronomical Society 463 (1) , pp. 1008-1025. 10.1093/mnras/stw1978

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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 similartemperature 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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Uncontrolled Keywords: stars: formation – ISM: clouds – ISM: Individual objects: Taurus and L1495.
Publisher: Oxford University Press
ISSN: 0035-8711
Funders: STFC
Date of First Compliant Deposit: 1 November 2016
Date of Acceptance: 5 August 2016
Last Modified: 18 Dec 2017 13:40
URI: http://orca.cf.ac.uk/id/eprint/95153

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