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An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: radio properties and the far-infrared/radio correlation

Thomson, A.P.; Ivison, R.J.; Simpson, J.M.; Swinbank, A.M.; Smail, I.; Arumugam, V.; Alexander, D.M.; Beelen, A.; Brandt, W.N.; Chandra, I.; Dannerbauer, H.; Greve, T.R.; Hodge, J.A.; Ibar, E.; Karim, A.; Murphy, E.J.; Schinnerer, E.; Sirothia, S.; Walter, F.; Wardlow, J.L.; van der Werf, P.

An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: radio properties and the far-infrared/radio correlation Thumbnail


Authors

A.P. Thomson

R.J. Ivison

J.M. Simpson

V. Arumugam

A. Beelen

W.N. Brandt

I. Chandra

H. Dannerbauer

T.R. Greve

J.A. Hodge

E. Ibar

A. Karim

E.J. Murphy

E. Schinnerer

S. Sirothia

F. Walter

J.L. Wardlow

P. van der Werf



Abstract

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.

Journal Article Type Article
Acceptance Date Apr 23, 2014
Publication Date Jul 21, 2014
Deposit Date Nov 17, 2014
Publicly Available Date Nov 24, 2014
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 442
Issue 1
Pages 577-588
DOI https://doi.org/10.1093/mnras/stu839
Keywords Galaxies: evolution, Galaxies: high-redshift, Galaxies: starburst.
Public URL https://durham-repository.worktribe.com/output/1417487

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Copyright 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.






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