TY - JOUR
T1 - The JCMT and Herschel Gould Belt Surveys
T2 - A comparison of SCUBA-2 and Herschel data of dense cores in the Taurus dark cloud L1495
AU - Ward-Thompson, D.
AU - Pattle, K.
AU - Kirk, J. M.
AU - Marsh, K.
AU - Buckle, J.
AU - Hatchell, J.
AU - Nutter, D. J.
AU - Griffin, M. J.
AU - Di Francesco, J.
AU - André, P.
AU - Beaulieu, S.
AU - Berry, D.
AU - Broekhoven-Fiene, H.
AU - Currie, M.
AU - Fich, M.
AU - Jenness, T.
AU - Johnstone, D.
AU - Kirk, H.
AU - Mottram, J.
AU - Pineda, J.
AU - Quinn, C.
AU - Sadavoy, S.
AU - Salji, C.
AU - Tisi, S.
AU - Walker-Smith, S.
AU - White, G.
AU - Hill, T.
AU - Könyves, V.
AU - Palmeirim, P.
AU - Pezzuto, S.
N1 - Publisher Copyright:
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
KW - ISM: clouds
KW - ISM: Individual objects: Taurus and L1495
KW - stars: formation
UR - https://www.scopus.com/pages/publications/85006821887
U2 - 10.1093/mnras/stw1978
DO - 10.1093/mnras/stw1978
M3 - Article
AN - SCOPUS:85006821887
SN - 0035-8711
VL - 463
SP - 1008
EP - 1025
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -