Journal Article

BLAST: the far-infrared/radio correlation in distant galaxies

R. J. Ivison, David M. Alexander, Andy D. Biggs, W. N. Brandt, Edward L. Chapin, Kristen E. K. Coppin, Mark J. Devlin, Mark Dickinson, James Dunlop, Simon Dye, Stephen A. Eales, David T. Frayer, Mark Halpern, David H. Hughes, Edo Ibar, A. Kovács, Gaelen Marsden, L. Moncelsi, Calvin B. Netterfield, Enzo Pascale, Guillaume Patanchon, D. A. Rafferty, Marie Rex, Eva Schinnerer, Douglas Scott, C. Semisch, Ian Smail, A. M. Swinbank, Matthew D. P. Truch, Gregory S. Tucker, Marco P. Viero, Fabian Walter, Axel Weiß, Donald V. Wiebe and Y. Q. Xue

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 1, pages 245-258
Published in print February 2010 | ISSN: 0035-8711
Published online February 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.15918.x
BLAST: the far-infrared/radio correlation in distant galaxies

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We investigate the correlation between far-infrared (FIR) and radio luminosities in distant galaxies, a lynchpin of modern astronomy. We use data from the Balloon-borne Large Aperture Submillimetre Telescope (BLAST), Spitzer, the Large Apex BOlometer CamerA (LABOCA), the Very Large Array and the Giant Metre-wave Radio Telescope (GMRT) in the Extended Chandra Deep Field South (ECDFS). For a catalogue of BLAST 250-μm-selected galaxies, we remeasure the 70–870-μm flux densities at the positions of their most likely 24-μm counterparts, which have a median [interquartile] redshift of 0.74 [0.25, 1.57]. From these, we determine the monochromatic flux density ratio, q250(= log10[S250 μm/S1400 MHz]), and the bolometric equivalent, qIR. At z≈ 0.6, where our 250-μm filter probes rest-frame 160-μm emission, we find no evolution relative to q160 for local galaxies. We also stack the FIR and submm images at the positions of 24-μm- and radio-selected galaxies. The difference between qIR seen for 250-μm- and radio-selected galaxies suggests that star formation provides most of the IR luminosity in ≲100-μJy radio galaxies, but rather less for those in the mJy regime. For the 24-μm sample, the radio spectral index is constant across 0 < z < 3, but qIR exhibits tentative evidence of a steady decline such that qIR∝ (1 +z)−0.15±0.03– significant evolution, spanning the epoch of galaxy formation, with major implications for techniques that rely on the FIR/radio correlation. We compare with model predictions and speculate that we may be seeing the increase in radio activity that gives rise to the radio background.

Keywords: galaxies: evolution; infrared: galaxies; radio continuum: galaxies

Journal Article.  9407 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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