University of Hertfordshire

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From the same journal

By the same authors

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  • 907025

    Accepted author manuscript, 599 KB, PDF document

  • Daniel Smith
  • M.J. Jarvis
  • M.J. Hardcastle
  • M. Vaccari
  • N. Bourne
  • L. Dunne
  • E. Ibar
  • N. Maddox
  • M. Prescott
  • C. Vlahakis
  • S. Eales
  • Steve J. Maddox
  • M. W. L. Smith
  • E. Valiante
  • G. de Zotti
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Original languageEnglish
Number of pages12
Pages (from-to)2232-2243
JournalMonthly Notices of the Royal Astronomical Society
Journal publication date11 Dec 2014
Volume445
Issue3
Early online date17 Oct 2014
DOIs
Publication statusPublished - 11 Dec 2014

Abstract

We use 10 387 galaxies from the Herschel Astrophysical TeraHertz Large Area Survey (H-ATLAS) to probe the far-infrared radio correlation (FIRC) of star-forming galaxies as a function of redshift, wavelength, and effective dust temperature. All of the sources in our 250 μm-selected sample have spectroscopic redshifts, as well as 1.4 GHz flux density estimates measured from the Faint Images of the Radio Sky at Twenty centimetres (FIRST) survey. This enables us to study not only individual sources, but also the average properties of the 250 μm-selected population using median stacking techniques. We find that individual sources detected at ≥5σ in both the H-ATLAS and FIRST data have logarithmic flux ratios (i.e. FIRC qλ parameters) consistent with previous studies of the FIRC. In contrast, the stacked values show larger qλ, suggesting excess far-IR flux density/luminosity in 250 μm-selected sources above what has been seen in previous analyses. In addition, we find evidence that 250 μm sources with warm dust spectral energy distributions have a larger 1.4 GHz luminosity than the cooler sources in our sample. Though we find no evidence for redshift evolution of the monochromatic FIRC, our analysis reveals significant temperature dependence. Whilst the FIRC is reasonably constant with temperature at 100 μm, we find increasing inverse correlation with temperature as we probe longer PACS and SPIRE wavelengths. These results may have important implications for the use of monochromatic dust luminosity as a star formation rate indicator in star-forming galaxies, and in the future, for using radio data to determine galaxy star formation rates

Notes

Date of Acceptance: 03/09/2014

ID: 8295135