Bibcode
Jarvis, Matt J.; Smith, D. J. B.; Bonfield, D. G.; Hardcastle, M. J.; Falder, J. T.; Stevens, J. A.; Ivison, R. J.; Auld, R.; Baes, M.; Baldry, I. K.; Bamford, S. P.; Bourne, N.; Buttiglione, S.; Cava, A.; Cooray, A.; Dariush, A.; de Zotti, G.; Dunlop, J. S.; Dunne, L.; Dye, S.; Eales, S.; Fritz, J.; Hill, D. T.; Hopwood, R.; Hughes, D. H.; Ibar, E.; Jones, D. H.; Kelvin, L.; Lawrence, A.; Leeuw, L.; Loveday, J.; Maddox, S. J.; Michałowski, M. J.; Negrello, M.; Norberg, P.; Pohlen, M.; Prescott, M.; Rigby, E. E.; Robotham, A.; Rodighiero, G.; Scott, D.; Sharp, R.; Temi, P.; Thompson, M. A.; van der Werf, P.; van Kampen, E.; Vlahakis, C.; White, G.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 409, Issue 1, pp. 92-101.
Advertised on:
11
2010
Citations
88
Refereed citations
78
Description
We use data from the Herschel-ATLAS to investigate the evolution of the
far-infrared-radio correlation over the redshift range 0 < z <
0.5. Using the total far-infrared luminosity of all >5σ sources
in the Herschel-ATLAS Science Demonstration Field and cross-matching
these data with radio data from the Faint Images of the Radio Sky at
Twenty-Centimetres (FIRST) survey and the NRAO Very Large Array (VLA)
Northern Sky Survey (NVSS), we obtain 104 radio counterparts to the
Herschel sources. With these data we find no evidence for evolution in
the far-infrared-radio correlation over the redshift range 0 < z <
0.5, where the median value for the ratio between far-infrared and radio
luminosity, qIR, over this range is qIR = 2.40 +/-
0.12 (and a mean of qIR = 2.52 +/- 0.03 accounting for the
lower limits), consistent with both the local value determined from IRAS
and values derived from surveys targeting the high-redshift Universe. By
comparing the radio fluxes of our sample measured from both FIRST and
NVSS we show that previous results suggesting an increase in the value
of qIR from high to low redshift may be the result of
resolving out extended emission of the low-redshift sources with
relatively high-resolution interferometric data, although contamination
from active galactic nuclei could still play a significant role.
We also find tentative evidence that the longer wavelength cooler dust
is heated by an evolved stellar population which does not trace the star
formation rate as closely as the shorter wavelength <~ 250μm
emission or the radio emission, supporting suggestions based on detailed
models of individual galaxies.
Herschel is an ESA space observatory with science instruments provided
by European-led Principal Investigator consortia and with important
participation from NASA.
E-mail: m.j.jarvis [at] herts.ac.uk (m[dot]j[dot]jarvis[at]herts[dot]ac[dot]uk)
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