Thomson, A.P. and Ivison, R.J. and Simpson, J.M. and Swinbank, A.M. and Smail, I. and Arumugam, V. and Alexander, D.M. and Beelen, A. and Brandt, W.N. and Chandra, I. and Dannerbauer, H. and Greve, T.R. and Hodge, J.A. and Ibar, E. and Karim, A. and Murphy, E.J. and Schinnerer, E. and Sirothia, S. and Walter, F. and Wardlow, J.L. and Werf, P.P. van der (2014) 'An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South : radio properties and the far-infrared/radio correlation.', Monthly notices of the Royal Astronomical Society., 442 (1). pp. 577-588.
We present a study of the radio properties of 870 μm-selected submillimetre galaxies (SMGs), observed at high resolution with Atacama Large Millimeter Array (ALMA) in the Extended Chandra Deep Field South. From our initial sample of 76 ALMA SMGs, we detect 52 SMGs at >3σ significance in Karl G. Jansky Very Large Array 1400 MHz imaging, of which 35 are also detected at >3σ in new 610 MHz Giant Metre-Wave Radio Telescope imaging. Within this sample of radio-detected SMGs, we measure a median radio spectral index α1400610=−0.79±0.06, (with inter-quartile range α = [−1.16, −0.56]) and investigate the far-infrared/radio correlation via the parameter qIR, the logarithmic ratio of the rest-frame 8–1000 μm flux and monochromatic radio flux. Our median qIR = 2.56 ± 0.05 (inter-quartile range qIR = [2.42, 2.78]) is higher than that typically seen in single-dish 870 μm-selected sources (qIR ∼ 2.4), which may reflect the fact that our ALMA-based study is not biased to radio-bright counterparts, as previous samples were. Finally, we search for evidence that qIR and α evolve with age in a codependent manner, as predicted by starburst models: the data populate the predicted region of parameter space, with the stellar mass tending to increase along tracks of qIR versus α in the direction expected, providing the first observational evidence in support of these models.
|Keywords:||Galaxies: evolution, Galaxies: high-redshift, Galaxies: starburst.|
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|Publisher Web site:||http://dx.doi.org/10.1093/mnras/stu839|
|Publisher statement:||This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.|
|Record Created:||21 Nov 2014 15:35|
|Last Modified:||26 Nov 2014 09:28|
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