University of Hertfordshire

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From the same journal

By the same authors

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  • Matthew W. L. Smith
  • Christopher J. R. Clark
  • Ilse De Looze
  • Isabella Lamperti
  • Amélie Saintonge
  • Christine D. Wilson
  • Gioacchino Accurso
  • Martin Bureau
  • Eun Jung Chung
  • Phillip J. Cigan
  • David L. Clements
  • Thavisha Dharmawardena
  • Lapo Fanciullo
  • Yang Gao
  • Yu Gao
  • Walter K. Gear
  • Haley L. Gomez
  • Joshua Greenslade
  • Ho Seong Hwang
  • Francisca Kemper
  • Jong Chul Lee
  • Cheng Li
  • Lihwai Lin
  • Lijie Liu
  • Dániel Cs Molnár
  • Angus Mok
  • Hsi-An Pan
  • Mark Sargent
  • Peter Scicluna
  • Connor M. A. Smith
  • Sheona Urquhart
  • Thomas G. Williams
  • Ting Xiao
  • Chentao Yang
  • Ming Zhu
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Original languageEnglish
Number of pages20
Pages (from-to)4166–4185
JournalMonthly Notices of the Royal Astronomical Society
Journal publication date1 Jul 2019
Volume486
Issue3
Early online date17 Apr 2019
DOIs
Publication statusPublished - 1 Jul 2019

Abstract

We present the SCUBA-2 850μ m component of JINGLE, the new JCMT large survey for dust and gas in nearby galaxies, which with 193 galaxies is the largest targeted survey of nearby galaxies at 850 μ m. We provide details of our SCUBA-2 data reduction pipeline, optimized for slightly extended sources, and including a calibration model adjusted to match conventions used in other far-infrared (FIR) data. We measure total integrated fluxes for the entire JINGLE sample in 10 infrared/submillimetre bands, including all WISE, Herschel-PACS, Herschel-SPIRE, and SCUBA-2 850 μ m maps, statistically accounting for the contamination by CO(J = 3-2) in the 850 μ m band. Of our initial sample of 193 galaxies, 191 are detected at 250 μ m with a ≥5σ significance. In the SCUBA-2 850 μ m band we detect 126 galaxies with ≥3σ significance. The distribution of the JINGLE galaxies in FIR/sub-millimetre colour-colour plots reveals that the sample is not well fit by single modified-blackbody models that assume a single dust-emissivity index (β). Instead, our new 850 μ m data suggest either that a large fraction of our objects require β < 1.5, or that a model allowing for an excess of sub-mm emission (e.g. a broken dust emissivity law, or a very cold dust component ≤10 K) is required. We provide relations to convert FIR colours to dust temperature and β for JINGLE-like galaxies. For JINGLE the FIR colours correlate more strongly with star-formation rate surface-density rather than the stellar surface-density, suggesting heating of dust is greater due to younger rather than older stellar-populations, consistent with the low proportion of early-type galaxies in the sample.

Notes

© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.

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