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http://hdl.handle.net/20.500.12386/24502
Titolo: | The JCMT and Herschel Gould Belt Surveys: a comparison of SCUBA-2 and Herschel data of dense cores in the Taurus dark cloud L1495 | Autori: | Ward-Thompson, D. Pattle, K. Kirk, J. M. Marsh, K. Buckle, J. Hatchell, J. Nutter, D. J. Griffin, M. J. 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. PEZZUTO, Stefano |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 463 | Fascicolo: | 1 | Da pagina:: | 1008 | 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. | URI: | http://hdl.handle.net/20.500.12386/24502 | URL: | https://academic.oup.com/mnras/article/463/1/1008/2589816 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw1978 | Bibcode ADS: | 2016MNRAS.463.1008W | Fulltext: | open |
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