University of Hertfordshire

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From the same journal

By the same authors

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    Accepted author manuscript, 1 MB, PDF-document

  • 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
Pages (from-to)4166–4185
JournalMonthly Notices of the Royal Astronomical Society
Journal publication date17 Apr 2019
Volume486
Issue3
DOIs
Publication statusPublished - 17 Apr 2019

Abstract

We present the SCUBA-2 850 ${\mu}m$ 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 ${\mu}m$. We provide details of our SCUBA-2 data reduction pipeline, optimised for slightly extended sources, and including a calibration model adjusted to match conventions used in other far-infrared 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 ${\mu}m$ maps, statistically accounting for the contamination by CO(J=3-2) in the 850 ${\mu}m$ band. Of our initial sample of 193 galaxies, 191 are detected at 250 ${\mu}m$ with a $\geq$ 5${\sigma}$ significance. In the SCUBA-2 850 ${\mu}m$ band we detect 126 galaxies with $\geq$ 3${\sigma}$ significance. The distribution of the JINGLE galaxies in far-infrared/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 $(\beta)$. Instead, our new 850 ${\mu}m$ data suggest either that a large fraction of our objects require $\beta <1.5$, 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 far-infrared colours to dust temperature and $\beta$ 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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